Changed all == null to is null and all !(* == null) to * is not null

src/NadekoBot/Common/Attributes/Ratelimit.cs

@@ -27,7 +27,7 @@ namespace NadekoBot.Core.Common.Attributes
             var cache = services.GetService<IDataCache>();
             var rem = cache.TryAddRatelimit(context.User.Id, command.Name, Seconds);
 
-            if(rem == null)
+            if(rem is null)
                 return Task.FromResult(PreconditionResult.FromSuccess());
 
             var msgContent = $"You can use this command again in {rem.Value.TotalSeconds:F1}s.";

src/NadekoBot/Common/Collections/ConcurrentHashSet.cs

@@ -176,7 +176,7 @@ namespace NadekoBot.Common.Collections
         public ConcurrentHashSet(IEnumerable<T> collection, IEqualityComparer<T> comparer)
             : this(comparer)
         {
-            if (collection == null) throw new ArgumentNullException(nameof(collection));
+            if (collection is null) throw new ArgumentNullException(nameof(collection));
 
             InitializeFromCollection(collection);
         }
@@ -205,8 +205,8 @@ namespace NadekoBot.Common.Collections
         public ConcurrentHashSet(int concurrencyLevel, IEnumerable<T> collection, IEqualityComparer<T> comparer)
             : this(concurrencyLevel, DefaultCapacity, false, comparer)
         {
-            if (collection == null) throw new ArgumentNullException(nameof(collection));
+            if (collection is null) throw new ArgumentNullException(nameof(collection));
-            if (comparer == null) throw new ArgumentNullException(nameof(comparer));
+            if (comparer is null) throw new ArgumentNullException(nameof(comparer));
 
             InitializeFromCollection(collection);
         }
@@ -348,11 +348,11 @@ namespace NadekoBot.Common.Collections
                     Node previous = null;
                     for (var current = tables.Buckets[bucketNo]; current != null; current = current.Next)
                     {
-                        Debug.Assert((previous == null && current == tables.Buckets[bucketNo]) || previous.Next == current);
+                        Debug.Assert((previous is null && current == tables.Buckets[bucketNo]) || previous.Next == current);
 
                         if (hashcode == current.Hashcode && _comparer.Equals(current.Item, item))
                         {
-                            if (previous == null)
+                            if (previous is null)
                             {
                                 Volatile.Write(ref tables.Buckets[bucketNo], current.Next);
                             }
@@ -406,7 +406,7 @@ namespace NadekoBot.Common.Collections
 
         void ICollection<T>.CopyTo(T[] array, int arrayIndex)
         {
-            if (array == null) throw new ArgumentNullException(nameof(array));
+            if (array is null) throw new ArgumentNullException(nameof(array));
             if (arrayIndex < 0) throw new ArgumentOutOfRangeException(nameof(arrayIndex));
 
             var locksAcquired = 0;
@@ -474,7 +474,7 @@ namespace NadekoBot.Common.Collections
                     Node previous = null;
                     for (var current = tables.Buckets[bucketNo]; current != null; current = current.Next)
                     {
-                        Debug.Assert((previous == null && current == tables.Buckets[bucketNo]) || previous.Next == current);
+                        Debug.Assert((previous is null && current == tables.Buckets[bucketNo]) || previous.Next == current);
                         if (hashcode == current.Hashcode && _comparer.Equals(current.Item, item))
                         {
                             return false;

src/NadekoBot/Common/Replacements/ReplacementBuilder.cs

@@ -69,8 +69,8 @@ namespace NadekoBot.Common.Replacements
         public ReplacementBuilder WithServer(DiscordSocketClient client, SocketGuild g)
         {
             /*OBSOLETE*/
-            _reps.TryAdd("%sid%", () => g == null ? "DM" : g.Id.ToString());
+            _reps.TryAdd("%sid%", () => g is null ? "DM" : g.Id.ToString());
-            _reps.TryAdd("%server%", () => g == null ? "DM" : g.Name);
+            _reps.TryAdd("%server%", () => g is null ? "DM" : g.Name);
             _reps.TryAdd("%members%", () => g != null && g is SocketGuild sg ? sg.MemberCount.ToString() : "?");
             _reps.TryAdd("%server_time%", () =>
             {
@@ -86,8 +86,8 @@ namespace NadekoBot.Common.Replacements
                     to).ToString("HH:mm ") + to.StandardName.GetInitials();
             });
             /*NEW*/
-            _reps.TryAdd("%server.id%", () => g == null ? "DM" : g.Id.ToString());
+            _reps.TryAdd("%server.id%", () => g is null ? "DM" : g.Id.ToString());
-            _reps.TryAdd("%server.name%", () => g == null ? "DM" : g.Name);
+            _reps.TryAdd("%server.name%", () => g is null ? "DM" : g.Name);
             _reps.TryAdd("%server.members%", () => g != null && g is SocketGuild sg ? sg.MemberCount.ToString() : "?");
             _reps.TryAdd("%server.time%", () =>
             {

src/NadekoBot/Common/TypeReaders/BotCommandTypeReader.cs

@@ -29,7 +29,7 @@ namespace NadekoBot.Common.TypeReaders
 
             var cmd = _cmds.Commands.FirstOrDefault(c =>
                 c.Aliases.Select(a => a.ToUpperInvariant()).Contains(input));
-            if (cmd == null)
+            if (cmd is null)
                 return Task.FromResult(TypeReaderResult.FromError(CommandError.ParseFailed, "No such command found."));
 
             return Task.FromResult(TypeReaderResult.FromSuccess(cmd));

src/NadekoBot/Common/TypeReaders/GuildDateTimeTypeReader.cs

@@ -17,7 +17,7 @@ namespace NadekoBot.Common.TypeReaders
         public override Task<TypeReaderResult> ReadAsync(ICommandContext context, string input, IServiceProvider services)
         {
             var gdt = Parse(services, context.Guild.Id, input);
-            if(gdt == null)
+            if(gdt is null)
                 return Task.FromResult(TypeReaderResult.FromError(CommandError.ParseFailed, "Input string is in an incorrect format."));
 
             return Task.FromResult(TypeReaderResult.FromSuccess(gdt));

src/NadekoBot/Common/TypeReaders/Models/PermissionAction.cs

@@ -14,7 +14,7 @@
 
         public override bool Equals(object obj)
         {
-            if (obj == null || GetType() != obj.GetType())
+            if (obj is null || GetType() != obj.GetType())
             {
                 return false;
             }

src/NadekoBot/Common/TypeReaders/ModuleTypeReader.cs

@@ -21,7 +21,7 @@ namespace NadekoBot.Common.TypeReaders
         {
             input = input.ToUpperInvariant();
             var module = _cmds.Modules.GroupBy(m => m.GetTopLevelModule()).FirstOrDefault(m => m.Key.Name.ToUpperInvariant() == input)?.Key;
-            if (module == null)
+            if (module is null)
                 return Task.FromResult(TypeReaderResult.FromError(CommandError.ParseFailed, "No such module found."));
 
             return Task.FromResult(TypeReaderResult.FromSuccess(module));
@@ -41,7 +41,7 @@ namespace NadekoBot.Common.TypeReaders
         {
             input = input.ToUpperInvariant();
             var module = _cmds.Modules.GroupBy(m => m.GetTopLevelModule()).FirstOrDefault(m => m.Key.Name.ToUpperInvariant() == input)?.Key;
-            if (module == null && input != "ACTUALCUSTOMREACTIONS")
+            if (module is null && input != "ACTUALCUSTOMREACTIONS")
                 return Task.FromResult(TypeReaderResult.FromError(CommandError.ParseFailed, "No such module found."));
 
             return Task.FromResult(TypeReaderResult.FromSuccess(new ModuleOrCrInfo

src/NadekoBot/Db/Extensions/GuildConfigExtensions.cs

@@ -28,7 +28,7 @@ namespace NadekoBot.Db
                 .Include(y => y.StreamRole.Whitelist)
                 .Include(y => y.StreamRole.Blacklist));
 
-            if (conf.StreamRole == null)
+            if (conf.StreamRole is null)
                 conf.StreamRole = new StreamRoleSettings();
 
             return conf.StreamRole;
@@ -79,7 +79,7 @@ namespace NadekoBot.Db
         {
             GuildConfig config;
 
-            if (includes == null)
+            if (includes is null)
             {
                 config = ctx
                     .GuildConfigs
@@ -92,7 +92,7 @@ namespace NadekoBot.Db
                 config = set.FirstOrDefault(c => c.GuildId == guildId);
             }
 
-            if (config == null)
+            if (config is null)
             {
                 ctx.GuildConfigs.Add((config = new GuildConfig
                 {
@@ -122,7 +122,7 @@ namespace NadekoBot.Db
                     .ThenInclude(gc => gc.IgnoredChannels)
                 .FirstOrDefault(x => x.GuildId == guildId);
 
-            if (config == null)
+            if (config is null)
             {
                 ctx.GuildConfigs.Add((config = new GuildConfig
                 {
@@ -160,7 +160,7 @@ namespace NadekoBot.Db
                 .Include(gc => gc.Permissions)
                 .FirstOrDefault();
 
-            if (config == null) // if there is no guildconfig, create new one
+            if (config is null) // if there is no guildconfig, create new one
             {
                 ctx.GuildConfigs.Add((config = new GuildConfig
                 {
@@ -169,7 +169,7 @@ namespace NadekoBot.Db
                 }));
                 ctx.SaveChanges();
             }
-            else if (config.Permissions == null || !config.Permissions.Any()) // if no perms, add default ones
+            else if (config.Permissions is null || !config.Permissions.Any()) // if no perms, add default ones
             {
                 config.Permissions = Permissionv2.GetDefaultPermlist;
                 ctx.SaveChanges();
@@ -200,7 +200,7 @@ namespace NadekoBot.Db
         {
             var conf = configs.FirstOrDefault(gc => gc.GuildId == id);
 
-            if (conf == null)
+            if (conf is null)
                 return;
 
             conf.CleverbotEnabled = cleverbotEnabled;
@@ -216,7 +216,7 @@ namespace NadekoBot.Db
                           .Include(x => x.XpSettings)
                           .ThenInclude(x => x.ExclusionList));
 
-            if (gc.XpSettings == null)
+            if (gc.XpSettings is null)
                 gc.XpSettings = new XpSettings();
 
             return gc.XpSettings;

src/NadekoBot/Db/Extensions/SelfAssignableRolesExtensions.cs

@@ -11,7 +11,7 @@ namespace NadekoBot.Db
         {
             var role = roles.FirstOrDefault(s => s.GuildId == guildId && s.RoleId == roleId);
 
-            if (role == null)
+            if (role is null)
                 return false;
 
             roles.Remove(role);

src/NadekoBot/Db/Extensions/UserXpExtensions.cs

@@ -13,7 +13,7 @@ namespace NadekoBot.Db
         {
             var usr = ctx.UserXpStats.FirstOrDefault(x => x.UserId == userId && x.GuildId == guildId);
 
-            if (usr == null)
+            if (usr is null)
             {
                 ctx.Add(usr = new UserXpStats()
                 {

src/NadekoBot/Db/Extensions/WaifuExtensions.cs

@@ -28,7 +28,7 @@ namespace NadekoBot.Db
     {
         public static WaifuInfo ByWaifuUserId(this DbSet<WaifuInfo> waifus, ulong userId, Func<DbSet<WaifuInfo>, IQueryable<WaifuInfo>> includes = null)
         {
-            if (includes == null)
+            if (includes is null)
             {
                 return waifus.Include(wi => wi.Waifu)
                             .Include(wi => wi.Affinity)

src/NadekoBot/Db/Extensions/WarningExtensions.cs

@@ -27,7 +27,7 @@ namespace NadekoBot.Db
                 .Skip(index)
                 .FirstOrDefault();
 
-            if (warn == null || warn.Forgiven)
+            if (warn is null || warn.Forgiven)
                 return false;
 
             warn.Forgiven = true;

src/NadekoBot/Db/Models/CommandAlias.cs

@@ -8,7 +8,7 @@
         //// override object.Equals
         //public override bool Equals(object obj)
         //{
-        //    if (obj == null || GetType() != obj.GetType())
+        //    if (obj is null || GetType() != obj.GetType())
         //    {
         //        return false;
         //    }

src/NadekoBot/Db/Models/ShopEntry.cs

@@ -33,7 +33,7 @@ namespace NadekoBot.Core.Services.Database.Models
 
         public override bool Equals(object obj)
         {
-            if (obj == null || GetType() != obj.GetType())
+            if (obj is null || GetType() != obj.GetType())
             {
                 return false;
             }

src/NadekoBot/Db/Models/SlowmodeIgnoredRole.cs

@@ -7,7 +7,7 @@
         // override object.Equals
         public override bool Equals(object obj)
         {
-            if (obj == null || GetType() != obj.GetType())
+            if (obj is null || GetType() != obj.GetType())
             {
                 return false;
             }

src/NadekoBot/Db/Models/SlowmodeIgnoredUser.cs

@@ -7,7 +7,7 @@
         // override object.Equals
         public override bool Equals(object obj)
         {
-            if (obj == null || GetType() != obj.GetType())
+            if (obj is null || GetType() != obj.GetType())
             {
                 return false;
             }

src/NadekoBot/Db/Models/Waifu.cs

@@ -31,7 +31,7 @@ namespace NadekoBot.Core.Services.Database.Models
             {
                 claimer = $"{ claimerUsername }#{Claimer.Discriminator}";
             }
-            if (AffinityId == null)
+            if (AffinityId is null)
             {
                 status = $"... but {waifuUsername}'s heart is empty";
             }
@@ -72,7 +72,7 @@ namespace NadekoBot.Core.Services.Database.Models
             {
                 claimer = $"{ claimerUsername }#{ClaimerDiscrim}";
             }
-            if (Affinity == null)
+            if (Affinity is null)
             {
                 status = $"... but {waifuUsername}'s heart is empty";
             }

src/NadekoBot/Modules/Administration/Administration.cs

@@ -28,7 +28,7 @@ namespace NadekoBot.Modules.Administration
         public async Task Slowmode(StoopidTime time = null)
         {
             var seconds = (int?)time?.Time.TotalSeconds ?? 0;
-            if (!(time is null) && (time.Time < TimeSpan.FromSeconds(0) || time.Time > TimeSpan.FromHours(6)))
+            if (time is not null && (time.Time < TimeSpan.FromSeconds(0) || time.Time > TimeSpan.FromHours(6)))
                 return;
             
 
@@ -305,13 +305,13 @@ namespace NadekoBot.Modules.Administration
 
 
             var msg = await channel.GetMessageAsync(messageId).ConfigureAwait(false);
-            if (msg == null)
+            if (msg is null)
             {
                 await ReplyErrorLocalizedAsync("msg_not_found").ConfigureAwait(false);
                 return;
             }
 
-            if (time == null)
+            if (time is null)
             {
                 await msg.DeleteAsync().ConfigureAwait(false);
             }

src/NadekoBot/Modules/Administration/AutoAssignRoleCommands.cs

@@ -55,7 +55,7 @@ namespace NadekoBot.Modules.Administration
                     return;
                 }
                 
-                var existing = roles.Select(rid => ctx.Guild.GetRole(rid)).Where(r => !(r is null))
+                var existing = roles.Select(rid => ctx.Guild.GetRole(rid)).Where(r => r is not null)
                     .ToList();
 
                 if (existing.Count != roles.Count)

src/NadekoBot/Modules/Administration/GameChannelCommands.cs

@@ -19,14 +19,14 @@ namespace NadekoBot.Modules.Administration
             {
                 var vch = ((IGuildUser)ctx.User).VoiceChannel;
 
-                if (vch == null)
+                if (vch is null)
                 {
                     await ReplyErrorLocalizedAsync("not_in_voice").ConfigureAwait(false);
                     return;
                 }
                 var id = _service.ToggleGameVoiceChannel(ctx.Guild.Id, vch.Id);
 
-                if (id == null)
+                if (id is null)
                 {
                     await ReplyConfirmLocalizedAsync("gvc_disabled").ConfigureAwait(false);
                 }

src/NadekoBot/Modules/Administration/LogCommands.cs

@@ -65,7 +65,7 @@ namespace NadekoBot.Modules.Administration
                 var str = string.Join("\n", Enum.GetNames(typeof(LogType))
                     .Select(x =>
                     {
-                        var val = l == null ? null : GetLogProperty(l, Enum.Parse<LogType>(x));
+                        var val = l is null ? null : GetLogProperty(l, Enum.Parse<LogType>(x));
                         if (val != null)
                             return $"{Format.Bold(x)} <#{val}>";
                         return Format.Bold(x);

src/NadekoBot/Modules/Administration/PlayingRotateCommands.cs

@@ -59,7 +59,7 @@ namespace NadekoBot.Modules.Administration
 
                 var msg = await _service.RemovePlayingAsync(index).ConfigureAwait(false);
 
-                if (msg == null)
+                if (msg is null)
                     return;
 
                 await ReplyConfirmLocalizedAsync("reprm", msg).ConfigureAwait(false);

src/NadekoBot/Modules/Administration/ProtectionCommands.cs

@@ -113,7 +113,7 @@ namespace NadekoBot.Modules.Administration
                     return;
                 }
                 
-                if (!(punishTime is null))
+                if (punishTime is not null)
                 {
                     if (!_service.IsDurationAllowed(action))
                     {
@@ -128,7 +128,7 @@ namespace NadekoBot.Modules.Administration
                 var stats = await _service.StartAntiRaidAsync(ctx.Guild.Id, userThreshold, seconds,
                     action, time).ConfigureAwait(false);
 
-                if (stats == null)
+                if (stats is null)
                 {
                     return;
                 }
@@ -185,7 +185,7 @@ namespace NadekoBot.Modules.Administration
                 if (messageCount < 2 || messageCount > 10)
                     return;
 
-                if (!(timeData is null))
+                if (timeData is not null)
                 {
                     if (!_service.IsDurationAllowed(action))
                     {
@@ -244,7 +244,7 @@ namespace NadekoBot.Modules.Administration
                         .WithValue(GetAntiRaidString(raid).TrimTo(1024))
                         .WithIsInline(true));
 
-                if (!(alt is null))
+                if (alt is not null)
                     embed.AddField("Anti-Alt", GetAntiAltString(alt), true);
 
                 await ctx.Channel.EmbedAsync(embed).ConfigureAwait(false);

src/NadekoBot/Modules/Administration/RoleCommands.cs

@@ -32,7 +32,7 @@ namespace NadekoBot.Modules.Administration
                 var msgs = await ((SocketTextChannel)ctx.Channel).GetMessagesAsync().FlattenAsync().ConfigureAwait(false);
                 var prev = (IUserMessage)msgs.FirstOrDefault(x => x is IUserMessage && x.Id != ctx.Message.Id);
 
-                if (prev == null)
+                if (prev is null)
                     return;
 
                 if (input.Length % 2 != 0)
@@ -144,7 +144,7 @@ namespace NadekoBot.Modules.Administration
                     {
                         var ch = g.GetTextChannel(rr.ChannelId);
                         IUserMessage msg = null;
-                        if (!(ch is null))
+                        if (ch is not null)
                         {
                             msg = await ch.GetMessageAsync(rr.MessageId).ConfigureAwait(false) as IUserMessage;
                         }

src/NadekoBot/Modules/Administration/SelfAssignedRolesCommands.cs

@@ -138,7 +138,7 @@ namespace NadekoBot.Modules.Administration
                         rolesStr.AppendLine("\t\t\t\t ⟪" + groupNameText + "⟫");
                         foreach (var (Model, Role) in kvp.AsEnumerable())
                         {
-                            if (Role == null)
+                            if (Role is null)
                             {
                                 continue;
                             }

src/NadekoBot/Modules/Administration/SelfCommands.cs

@@ -58,7 +58,7 @@ namespace NadekoBot.Modules.Administration
                 await ctx.Channel.EmbedAsync(new EmbedBuilder().WithOkColor()
                     .WithTitle(GetText("scadd"))
                     .AddField(efb => efb.WithName(GetText("server"))
-                        .WithValue(cmd.GuildId == null ? $"-" : $"{cmd.GuildName}/{cmd.GuildId}").WithIsInline(true))
+                        .WithValue(cmd.GuildId is null ? $"-" : $"{cmd.GuildName}/{cmd.GuildId}").WithIsInline(true))
                     .AddField(efb => efb.WithName(GetText("channel"))
                         .WithValue($"{cmd.ChannelName}/{cmd.ChannelId}").WithIsInline(true))
                     .AddField(efb => efb.WithName(GetText("command_text"))
@@ -419,7 +419,7 @@ namespace NadekoBot.Modules.Administration
                     .WithDefault(Context)
                     .Build();
 
-                await _bot.SetGameAsync(game == null ? game : rep.Replace(game), type).ConfigureAwait(false);
+                await _bot.SetGameAsync(game is null ? game : rep.Replace(game), type).ConfigureAwait(false);
 
                 await ReplyConfirmLocalizedAsync("set_game").ConfigureAwait(false);
             }
@@ -448,7 +448,7 @@ namespace NadekoBot.Modules.Administration
                 var sid = ulong.Parse(ids[0]);
                 var server = _client.Guilds.FirstOrDefault(s => s.Id == sid);
 
-                if (server == null)
+                if (server is null)
                     return;
 
                 var rep = new ReplacementBuilder()
@@ -459,7 +459,7 @@ namespace NadekoBot.Modules.Administration
                 {
                     var cid = ulong.Parse(ids[1].Substring(2));
                     var ch = server.TextChannels.FirstOrDefault(c => c.Id == cid);
-                    if (ch == null)
+                    if (ch is null)
                     {
                         return;
                     }
@@ -477,7 +477,7 @@ namespace NadekoBot.Modules.Administration
                 {
                     var uid = ulong.Parse(ids[1].Substring(2));
                     var user = server.Users.FirstOrDefault(u => u.Id == uid);
-                    if (user == null)
+                    if (user is null)
                     {
                         return;
                     }

src/NadekoBot/Modules/Administration/Services/AdministrationService.cs

@@ -102,7 +102,7 @@ namespace NadekoBot.Modules.Administration.Services
                 var old = conf.DelMsgOnCmdChannels.FirstOrDefault(x => x.ChannelId == chId);
                 if (newState == Administration.State.Inherit)
                 {
-                    if (!(old is null))
+                    if (old is not null)
                     {
                         conf.DelMsgOnCmdChannels.Remove(old);
                         uow.Remove(old);

src/NadekoBot/Modules/Administration/Services/AutoAssignRoleService.cs

@@ -53,7 +53,7 @@ namespace NadekoBot.Modules.Administration.Services
                     {
                         var roleIds = savedRoleIds
                             .Select(roleId => user.Guild.GetRole(roleId))
-                            .Where(x => !(x is null))
+                            .Where(x => x is not null)
                             .ToList();
                         
                         if (roleIds.Any())

src/NadekoBot/Modules/Administration/Services/DangerousCommandsService.cs

@@ -101,7 +101,7 @@ DELETE FROM Clubs;";
                 .FirstOrDefaultAsyncEF(x => x.Waifu.UserId == userId);
 
             // if it exists, delete waifu related things
-            if (!(wi is null))
+            if (wi is not null)
             {
                 // remove updates which have new or old as this waifu
                 await uow

src/NadekoBot/Modules/Administration/Services/DiscordPermOverrideService.cs

@@ -145,7 +145,7 @@ namespace NadekoBot.Modules.Administration.Services
         public async Task<bool> TryBlockLate(DiscordSocketClient client, ICommandContext context, string moduleName,
             CommandInfo command)
         {
-            if (TryGetOverrides(context.Guild?.Id ?? 0, command.Name, out var perm) && !(perm is null))
+            if (TryGetOverrides(context.Guild?.Id ?? 0, command.Name, out var perm) && perm is not null)
             {
                 var result = await new RequireUserPermissionAttribute((GuildPermission) perm)
                     .CheckPermissionsAsync(context, command, _services);

src/NadekoBot/Modules/Administration/Services/GameVoiceChannelService.cs

@@ -38,7 +38,7 @@ namespace NadekoBot.Modules.Administration.Services
                 {
                     //if the user is in the voice channel and that voice channel is gvc
                     var vc = after.VoiceChannel;
-                    if (vc == null || !GameVoiceChannels.Contains(vc.Id))
+                    if (vc is null || !GameVoiceChannels.Contains(vc.Id))
                         return;
 
                     //if the activity has changed, and is a playing activity
@@ -96,7 +96,7 @@ namespace NadekoBot.Modules.Administration.Services
                     var game = gUser.Activity?.Name;
 
                     if (oldState.VoiceChannel == newState.VoiceChannel ||
-                        newState.VoiceChannel == null)
+                        newState.VoiceChannel is null)
                         return;
 
                     if (!GameVoiceChannels.Contains(newState.VoiceChannel.Id) ||
@@ -123,7 +123,7 @@ namespace NadekoBot.Modules.Administration.Services
             var vch = gUser.Guild.VoiceChannels
                 .FirstOrDefault(x => x.Name.ToLowerInvariant() == game);
 
-            if (vch == null)
+            if (vch is null)
                 return;
 
             await Task.Delay(1000).ConfigureAwait(false);

src/NadekoBot/Modules/Administration/Services/GuildTimezoneService.cs

@@ -45,7 +45,7 @@ namespace NadekoBot.Modules.Administration.Services
             TimeZoneInfo tz;
             try
             {
-                if (x.TimeZoneId == null)
+                if (x.TimeZoneId is null)
                     tz = null;
                 else
                     tz = TimeZoneInfo.FindSystemTimeZoneById(x.TimeZoneId);
@@ -73,7 +73,7 @@ namespace NadekoBot.Modules.Administration.Services
                 gc.TimeZoneId = tz?.Id;
                 uow.SaveChanges();
 
-                if (tz == null)
+                if (tz is null)
                     _timezones.TryRemove(guildId, out tz);
                 else
                     _timezones.AddOrUpdate(guildId, tz, (key, old) => tz);

src/NadekoBot/Modules/Administration/Services/LogCommandService.cs

@@ -203,12 +203,12 @@ namespace NadekoBot.Modules.Administration.Services
                     var g = after.Guild;
 
                     if (!GuildLogSettings.TryGetValue(g.Id, out LogSetting logSetting)
-                        || (logSetting.UserUpdatedId == null))
+                        || (logSetting.UserUpdatedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel =
-                        await TryGetLogChannel(g, logSetting, LogType.UserUpdated).ConfigureAwait(false)) == null)
+                        await TryGetLogChannel(g, logSetting, LogType.UserUpdated).ConfigureAwait(false)) is null)
                         return;
 
                     var embed = new EmbedBuilder();
@@ -262,54 +262,54 @@ namespace NadekoBot.Modules.Administration.Services
                 switch (type)
                 {
                     case LogType.Other:
-                        channelId = logSetting.LogOtherId = (logSetting.LogOtherId == null ? cid : default);
+                        channelId = logSetting.LogOtherId = (logSetting.LogOtherId is null ? cid : default);
                         break;
                     case LogType.MessageUpdated:
-                        channelId = logSetting.MessageUpdatedId = (logSetting.MessageUpdatedId == null ? cid : default);
+                        channelId = logSetting.MessageUpdatedId = (logSetting.MessageUpdatedId is null ? cid : default);
                         break;
                     case LogType.MessageDeleted:
-                        channelId = logSetting.MessageDeletedId = (logSetting.MessageDeletedId == null ? cid : default);
+                        channelId = logSetting.MessageDeletedId = (logSetting.MessageDeletedId is null ? cid : default);
                         //logSetting.DontLogBotMessageDeleted = (options == "nobot");
                         break;
                     case LogType.UserJoined:
-                        channelId = logSetting.UserJoinedId = (logSetting.UserJoinedId == null ? cid : default);
+                        channelId = logSetting.UserJoinedId = (logSetting.UserJoinedId is null ? cid : default);
                         break;
                     case LogType.UserLeft:
-                        channelId = logSetting.UserLeftId = (logSetting.UserLeftId == null ? cid : default);
+                        channelId = logSetting.UserLeftId = (logSetting.UserLeftId is null ? cid : default);
                         break;
                     case LogType.UserBanned:
-                        channelId = logSetting.UserBannedId = (logSetting.UserBannedId == null ? cid : default);
+                        channelId = logSetting.UserBannedId = (logSetting.UserBannedId is null ? cid : default);
                         break;
                     case LogType.UserUnbanned:
-                        channelId = logSetting.UserUnbannedId = (logSetting.UserUnbannedId == null ? cid : default);
+                        channelId = logSetting.UserUnbannedId = (logSetting.UserUnbannedId is null ? cid : default);
                         break;
                     case LogType.UserUpdated:
-                        channelId = logSetting.UserUpdatedId = (logSetting.UserUpdatedId == null ? cid : default);
+                        channelId = logSetting.UserUpdatedId = (logSetting.UserUpdatedId is null ? cid : default);
                         break;
                     case LogType.UserMuted:
-                        channelId = logSetting.UserMutedId = (logSetting.UserMutedId == null ? cid : default);
+                        channelId = logSetting.UserMutedId = (logSetting.UserMutedId is null ? cid : default);
                         break;
                     case LogType.ChannelCreated:
-                        channelId = logSetting.ChannelCreatedId = (logSetting.ChannelCreatedId == null ? cid : default);
+                        channelId = logSetting.ChannelCreatedId = (logSetting.ChannelCreatedId is null ? cid : default);
                         break;
                     case LogType.ChannelDestroyed:
                         channelId = logSetting.ChannelDestroyedId =
-                            (logSetting.ChannelDestroyedId == null ? cid : default);
+                            (logSetting.ChannelDestroyedId is null ? cid : default);
                         break;
                     case LogType.ChannelUpdated:
-                        channelId = logSetting.ChannelUpdatedId = (logSetting.ChannelUpdatedId == null ? cid : default);
+                        channelId = logSetting.ChannelUpdatedId = (logSetting.ChannelUpdatedId is null ? cid : default);
                         break;
                     case LogType.UserPresence:
                         channelId = logSetting.LogUserPresenceId =
-                            (logSetting.LogUserPresenceId == null ? cid : default);
+                            (logSetting.LogUserPresenceId is null ? cid : default);
                         break;
                     case LogType.VoicePresence:
                         channelId = logSetting.LogVoicePresenceId =
-                            (logSetting.LogVoicePresenceId == null ? cid : default);
+                            (logSetting.LogVoicePresenceId is null ? cid : default);
                         break;
                     case LogType.VoicePresenceTTS:
                         channelId = logSetting.LogVoicePresenceTTSId =
-                            (logSetting.LogVoicePresenceTTSId == null ? cid : default);
+                            (logSetting.LogVoicePresenceTTSId is null ? cid : default);
                         break;
                 }
 
@@ -335,12 +335,12 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.LogVoicePresenceTTSId == null))
+                        || (logSetting.LogVoicePresenceTTSId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.VoicePresenceTTS)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     var str = "";
@@ -348,11 +348,11 @@ namespace NadekoBot.Modules.Administration.Services
                     {
                         str = GetText(logChannel.Guild, "log_vc_moved", usr.Username, beforeVch?.Name, afterVch?.Name);
                     }
-                    else if (beforeVch == null)
+                    else if (beforeVch is null)
                     {
                         str = GetText(logChannel.Guild, "log_vc_joined", usr.Username, afterVch.Name);
                     }
-                    else if (afterVch == null)
+                    else if (afterVch is null)
                     {
                         str = GetText(logChannel.Guild, "log_vc_left", usr.Username, beforeVch.Name);
                     }
@@ -375,12 +375,12 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserMutedId == null))
+                        || (logSetting.UserMutedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.UserMuted)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
                     var mutes = "";
                     var mutedLocalized = GetText(logChannel.Guild, "muted_sn");
@@ -419,12 +419,12 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserMutedId == null))
+                        || (logSetting.UserMutedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.UserMuted)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     var mutes = "";
@@ -471,11 +471,11 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(users.First().Guild.Id, out LogSetting logSetting)
-                        || (logSetting.LogOtherId == null))
+                        || (logSetting.LogOtherId is null))
                         return;
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(users.First().Guild, logSetting, LogType.Other)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     var punishment = "";
@@ -642,13 +642,13 @@ namespace NadekoBot.Modules.Administration.Services
                     var after = (IGuildChannel) cafter;
 
                     if (!GuildLogSettings.TryGetValue(before.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.ChannelUpdatedId == null)
+                        || (logSetting.ChannelUpdatedId is null)
                         || logSetting.IgnoredChannels.Any(ilc => ilc.ChannelId == after.Id))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(before.Guild, logSetting, LogType.ChannelUpdated)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     var embed = new EmbedBuilder().WithOkColor()
@@ -698,13 +698,13 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(ch.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.ChannelDestroyedId == null)
+                        || (logSetting.ChannelDestroyedId is null)
                         || logSetting.IgnoredChannels.Any(ilc => ilc.ChannelId == ch.Id))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(ch.Guild, logSetting, LogType.ChannelDestroyed)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
                     string title;
                     if (ch is IVoiceChannel)
@@ -738,12 +738,12 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(ch.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.ChannelCreatedId == null))
+                        || (logSetting.ChannelCreatedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(ch.Guild, logSetting, LogType.ChannelCreated)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
                     string title;
                     if (ch is IVoiceChannel)
@@ -783,12 +783,12 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.LogVoicePresenceId == null))
+                        || (logSetting.LogVoicePresenceId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.VoicePresence)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     string str = null;
@@ -799,14 +799,14 @@ namespace NadekoBot.Modules.Administration.Services
                             "👤" + Format.Bold(usr.Username + "#" + usr.Discriminator),
                             Format.Bold(beforeVch?.Name ?? ""), Format.Bold(afterVch?.Name ?? ""));
                     }
-                    else if (beforeVch == null)
+                    else if (beforeVch is null)
                     {
                         str = "🎙" + Format.Code(PrettyCurrentTime(usr.Guild)) + GetText(logChannel.Guild,
                             "user_vjoined",
                             "👤" + Format.Bold(usr.Username + "#" + usr.Discriminator),
                             Format.Bold(afterVch.Name ?? ""));
                     }
-                    else if (afterVch == null)
+                    else if (afterVch is null)
                     {
                         str = "🎙" + Format.Code(PrettyCurrentTime(usr.Guild)) + GetText(logChannel.Guild, "user_vleft",
                             "👤" + Format.Bold(usr.Username + "#" + usr.Discriminator),
@@ -836,16 +836,16 @@ namespace NadekoBot.Modules.Administration.Services
         //        {
         //            var guild = optGuild.GetValueOrDefault() ?? (usr as SocketGuildUser)?.Guild;
 
-        //            if (guild == null)
+        //            if (guild is null)
         //                return;
 
         //            if (!GuildLogSettings.TryGetValue(guild.Id, out LogSetting logSetting)
-        //                || (logSetting.LogUserPresenceId == null)
+        //                || (logSetting.LogUserPresenceId is null)
         //                || before.Status == after.Status)
         //                return;
 
         //            ITextChannel logChannel;
-        //            if ((logChannel = await TryGetLogChannel(guild, logSetting, LogType.UserPresence)) == null)
+        //            if ((logChannel = await TryGetLogChannel(guild, logSetting, LogType.UserPresence)) is null)
         //                return;
         //            string str = "";
         //            if (before.Status != after.Status)
@@ -878,12 +878,12 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserLeftId == null))
+                        || (logSetting.UserLeftId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.UserLeft)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
                     var embed = new EmbedBuilder()
                         .WithOkColor()
@@ -912,12 +912,12 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(usr.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserJoinedId == null))
+                        || (logSetting.UserJoinedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(usr.Guild, logSetting, LogType.UserJoined)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
 
                     var embed = new EmbedBuilder()
@@ -953,12 +953,12 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserUnbannedId == null))
+                        || (logSetting.UserUnbannedId is null))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(guild, logSetting, LogType.UserUnbanned)
-                        .ConfigureAwait(false)) == null)
+                        .ConfigureAwait(false)) is null)
                         return;
                     var embed = new EmbedBuilder()
                         .WithOkColor()
@@ -987,7 +987,7 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     if (!GuildLogSettings.TryGetValue(guild.Id, out LogSetting logSetting)
-                        || (logSetting.UserBannedId == null))
+                        || (logSetting.UserBannedId is null))
                         return;
 
                     ITextChannel logChannel;
@@ -1024,7 +1024,7 @@ namespace NadekoBot.Modules.Administration.Services
                 try
                 {
                     var msg = (optMsg.HasValue ? optMsg.Value : null) as IUserMessage;
-                    if (msg == null || msg.IsAuthor(_client))
+                    if (msg is null || msg.IsAuthor(_client))
                         return;
 
                     if (_ignoreMessageIds.Contains(msg.Id))
@@ -1034,13 +1034,13 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(channel.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.MessageDeletedId == null)
+                        || (logSetting.MessageDeletedId is null)
                         || logSetting.IgnoredChannels.Any(ilc => ilc.ChannelId == channel.Id))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(channel.Guild, logSetting, LogType.MessageDeleted)
-                        .ConfigureAwait(false)) == null || logChannel.Id == msg.Id)
+                        .ConfigureAwait(false)) is null || logChannel.Id == msg.Id)
                         return;
 
                     var resolvedMessage = msg.Resolve(userHandling: TagHandling.FullName);
@@ -1080,7 +1080,7 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     var before = (optmsg.HasValue ? optmsg.Value : null) as IUserMessage;
-                    if (before == null)
+                    if (before is null)
                         return;
 
                     if (!(ch is ITextChannel channel))
@@ -1093,13 +1093,13 @@ namespace NadekoBot.Modules.Administration.Services
                         return;
 
                     if (!GuildLogSettings.TryGetValue(channel.Guild.Id, out LogSetting logSetting)
-                        || (logSetting.MessageUpdatedId == null)
+                        || (logSetting.MessageUpdatedId is null)
                         || logSetting.IgnoredChannels.Any(ilc => ilc.ChannelId == channel.Id))
                         return;
 
                     ITextChannel logChannel;
                     if ((logChannel = await TryGetLogChannel(channel.Guild, logSetting, LogType.MessageUpdated)
-                        .ConfigureAwait(false)) == null || logChannel.Id == after.Channel.Id)
+                        .ConfigureAwait(false)) is null || logChannel.Id == after.Channel.Id)
                         return;
 
                     var embed = new EmbedBuilder()
@@ -1208,7 +1208,7 @@ namespace NadekoBot.Modules.Administration.Services
 
             var channel = await guild.GetTextChannelAsync(id.Value).ConfigureAwait(false);
 
-            if (channel == null)
+            if (channel is null)
             {
                 UnsetLogSetting(guild.Id, logChannelType);
                 return null;

src/NadekoBot/Modules/Administration/Services/MuteService.cs

@@ -159,7 +159,7 @@ namespace NadekoBot.Modules.Administration.Services
             {
                 MutedUsers.TryGetValue(usr.Guild.Id, out ConcurrentHashSet<ulong> muted);
 
-                if (muted == null || !muted.Contains(usr.Id))
+                if (muted is null || !muted.Contains(usr.Id))
                     return Task.CompletedTask;
                 var _ = Task.Run(() => MuteUser(usr, _client.CurrentUser, reason: "Sticky mute").ConfigureAwait(false));
             }
@@ -259,7 +259,7 @@ namespace NadekoBot.Modules.Administration.Services
             }
             else if (type == MuteType.Voice)
             {
-                if (usr == null)
+                if (usr is null)
                     return;
                 try
                 {
@@ -270,7 +270,7 @@ namespace NadekoBot.Modules.Administration.Services
             }
             else if (type == MuteType.Chat)
             {
-                if (usr == null)
+                if (usr is null)
                     return;
                 await usr.RemoveRoleAsync(await GetMuteRole(usr.Guild).ConfigureAwait(false)).ConfigureAwait(false);
                 UserUnmuted(usr, mod, MuteType.Chat, reason);
@@ -279,7 +279,7 @@ namespace NadekoBot.Modules.Administration.Services
 
         public async Task<IRole> GetMuteRole(IGuild guild)
         {
-            if (guild == null)
+            if (guild is null)
                 throw new ArgumentNullException(nameof(guild));
 
             const string defaultMuteRoleName = "nadeko-mute";
@@ -287,7 +287,7 @@ namespace NadekoBot.Modules.Administration.Services
             var muteRoleName = GuildMuteRoles.GetOrAdd(guild.Id, defaultMuteRoleName);
 
             var muteRole = guild.Roles.FirstOrDefault(r => r.Name == muteRoleName);
-            if (muteRole == null)
+            if (muteRole is null)
             {
 
                 //if it doesn't exist, create it

src/NadekoBot/Modules/Administration/Services/ProtectionService.cs

@@ -141,7 +141,7 @@ namespace NadekoBot.Modules.Administration.Services
                 _antiSpamGuilds[gc.GuildId] = new AntiSpamStats() { AntiSpamSettings = spam };
 
             var alt = gc.AntiAltSetting;
-            if (!(alt is null))
+            if (alt is not null)
                 _antiAltGuilds[gc.GuildId] = new AntiAltStats(alt);
         }
 

src/NadekoBot/Modules/Administration/Services/RoleCommandsService.cs

@@ -53,7 +53,7 @@ namespace NadekoBot.Modules.Administration.Services
 
                     var conf = confs.FirstOrDefault(x => x.MessageId == msg.Id);
 
-                    if (conf == null)
+                    if (conf is null)
                         return;
 
                     // compare emote names for backwards compatibility :facepalm:
@@ -129,7 +129,7 @@ namespace NadekoBot.Modules.Administration.Services
 
                     var conf = confs.FirstOrDefault(x => x.MessageId == msg.Id);
 
-                    if (conf == null)
+                    if (conf is null)
                         return;
 
                     var reactionRole = conf.ReactionRoles.FirstOrDefault(x => x.EmoteName == reaction.Emote.Name || x.EmoteName == reaction.Emote.ToString());
@@ -137,7 +137,7 @@ namespace NadekoBot.Modules.Administration.Services
                     if (reactionRole != null)
                     {
                         var role = gusr.Guild.GetRole(reactionRole.RoleId);
-                        if (role == null)
+                        if (role is null)
                             return;
                         await gusr.RemoveRoleAsync(role).ConfigureAwait(false);
                     }

src/NadekoBot/Modules/Administration/Services/SelfAssignedRolesService.cs

@@ -82,7 +82,7 @@ namespace NadekoBot.Modules.Administration.Services
             var (autoDelete, exclusive, roles) = GetAdAndRoles(guildUser.Guild.Id);
 
             var theRoleYouWant = roles.FirstOrDefault(r => r.RoleId == role.Id);
-            if (theRoleYouWant == null)
+            if (theRoleYouWant is null)
             {
                 return (AssignResult.Err_Not_Assignable, autoDelete, null);
             }
@@ -145,7 +145,7 @@ namespace NadekoBot.Modules.Administration.Services
                     if (toUpdate != null)
                         gc.SelfAssignableRoleGroupNames.Remove(toUpdate);
                 }
-                else if (toUpdate == null)
+                else if (toUpdate is null)
                 {
                     gc.SelfAssignableRoleGroupNames.Add(new GroupName
                     {
@@ -170,7 +170,7 @@ namespace NadekoBot.Modules.Administration.Services
         {
             var (autoDelete, _, roles) = GetAdAndRoles(guildUser.Guild.Id);
 
-            if (roles.FirstOrDefault(r => r.RoleId == role.Id) == null)
+            if (roles.FirstOrDefault(r => r.RoleId == role.Id) is null)
             {
                 return (RemoveResult.Err_Not_Assignable, autoDelete);
             }
@@ -261,7 +261,7 @@ namespace NadekoBot.Modules.Administration.Services
                 var roleModels = uow.SelfAssignableRoles.GetFromGuild(guild.Id);
                 roles = roleModels
                     .Select(x => (Model: x, Role: guild.GetRole(x.RoleId)));
-                uow.SelfAssignableRoles.RemoveRange(roles.Where(x => x.Role == null).Select(x => x.Model).ToArray());
+                uow.SelfAssignableRoles.RemoveRange(roles.Where(x => x.Role is null).Select(x => x.Model).ToArray());
                 uow.SaveChanges();
             }
 

src/NadekoBot/Modules/Administration/Services/SelfService.cs

@@ -74,7 +74,7 @@ namespace NadekoBot.Modules.Administration.Services
                     var server = _client.Guilds.FirstOrDefault(g => g.Id.ToString() == guildStr) ??
                                  _client.Guilds.FirstOrDefault(g => g.Name.Trim().ToUpperInvariant() == guildStr);
 
-                    if (server == null)
+                    if (server is null)
                     {
                         return;
                     }
@@ -205,7 +205,7 @@ namespace NadekoBot.Modules.Administration.Services
             var channels = await Task.WhenAll(_creds.OwnerIds.Select(id =>
             {
                 var user = _client.GetUser(id);
-                if (user == null)
+                if (user is null)
                     return Task.FromResult<IDMChannel>(null);
 
                 return user.GetOrCreateDMChannelAsync();

src/NadekoBot/Modules/Administration/Services/UserPunishService.cs

@@ -80,7 +80,7 @@ namespace NadekoBot.Modules.Administration.Services
             if (p != null)
             {
                 var user = await guild.GetUserAsync(userId).ConfigureAwait(false);
-                if (user == null)
+                if (user is null)
                     return null;
 
                 await ApplyPunishment(guild, user, mod, p.Punishment, p.Time, p.RoleId, "Warned too many times.");
@@ -146,7 +146,7 @@ namespace NadekoBot.Modules.Administration.Services
                     if (roleId is null)
                         return;
                     var role = guild.GetRole(roleId.Value);
-                    if (!(role is null))
+                    if (role is not null)
                     {
                         if (minutes == 0)
                             await user.AddRoleAsync(role).ConfigureAwait(false);
@@ -389,14 +389,14 @@ WHERE GuildId={guildId}
                     .AsQueryable()
                     .FirstOrDefault(x => x.GuildId == guildId);
 
-                if (text == null)
+                if (text is null)
                 {
                     if (template is null)
                         return;
                     
                     uow.Remove(template);
                 }
-                else if (template == null)
+                else if (template is null)
                 {
                     uow.BanTemplates.Add(new BanTemplate()
                     {

src/NadekoBot/Modules/Administration/Services/VcRoleService.cs

@@ -106,7 +106,7 @@ namespace NadekoBot.Modules.Administration.Services
         {
             await Task.Yield();
             var g = _client.GetGuild(gconf.GuildId);
-            if (g == null)
+            if (g is null)
                 return;
 
             var infos = new ConcurrentDictionary<ulong, IRole>();
@@ -115,7 +115,7 @@ namespace NadekoBot.Modules.Administration.Services
             foreach (var ri in gconf.VcRoleInfos)
             {
                 var role = g.GetRole(ri.RoleId);
-                if (role == null)
+                if (role is null)
                 {
                     missingRoles.Add(ri);
                     continue;
@@ -137,7 +137,7 @@ namespace NadekoBot.Modules.Administration.Services
 
         public void AddVcRole(ulong guildId, IRole role, ulong vcId)
         {
-            if (role == null)
+            if (role is null)
                 throw new ArgumentNullException(nameof(role));
 
             var guildVcRoles = VcRoles.GetOrAdd(guildId, new ConcurrentDictionary<ulong, IRole>());
@@ -184,7 +184,7 @@ namespace NadekoBot.Modules.Administration.Services
         {
 
             var gusr = usr as SocketGuildUser;
-            if (gusr == null)
+            if (gusr is null)
                 return Task.CompletedTask;
 
             var oldVc = oldState.VoiceChannel;

src/NadekoBot/Modules/Administration/TimeZoneCommands.cs

@@ -76,7 +76,7 @@ namespace NadekoBot.Modules.Administration
                 try { tz = TimeZoneInfo.FindSystemTimeZoneById(id); } catch { tz = null; }
 
 
-                if (tz == null)
+                if (tz is null)
                 {
                     await ReplyErrorLocalizedAsync("timezone_not_found").ConfigureAwait(false);
                     return;

src/NadekoBot/Modules/Administration/UserPunishCommands.cs

@@ -94,7 +94,7 @@ namespace NadekoBot.Modules.Administration
 
                 var embed = new EmbedBuilder()
                     .WithOkColor();
-                if (punishment == null)
+                if (punishment is null)
                 {
                     embed.WithDescription(GetText("user_warned",
                         Format.Bold(user.ToString())));
@@ -430,7 +430,7 @@ namespace NadekoBot.Modules.Administration
                     {
                         var defaultMessage = GetText("bandm", Format.Bold(ctx.Guild.Name), msg);
                         var embed = _service.GetBanUserDmEmbed(Context, guildUser, defaultMessage, msg, time.Time);
-                        if (!(embed is null))
+                        if (embed is not null)
                         {
                             var userChannel = await guildUser.GetOrCreateDMChannelAsync();
                             await userChannel.EmbedAsync(embed);
@@ -497,7 +497,7 @@ namespace NadekoBot.Modules.Administration
                 {
                     var defaultMessage = GetText("bandm", Format.Bold(ctx.Guild.Name), msg);
                     var embed = _service.GetBanUserDmEmbed(Context, user, defaultMessage, msg, null);
-                    if (!(embed is null))
+                    if (embed is not null)
                     {
                         var userChannel = await user.GetOrCreateDMChannelAsync();
                         await userChannel.EmbedAsync(embed);
@@ -613,7 +613,7 @@ namespace NadekoBot.Modules.Administration
 
                 var bun = bans.FirstOrDefault(x => x.User.ToString().ToLowerInvariant() == user.ToLowerInvariant());
 
-                if (bun == null)
+                if (bun is null)
                 {
                     await ReplyErrorLocalizedAsync("user_not_found").ConfigureAwait(false);
                     return;
@@ -632,7 +632,7 @@ namespace NadekoBot.Modules.Administration
 
                 var bun = bans.FirstOrDefault(x => x.User.Id == userId);
 
-                if (bun == null)
+                if (bun is null)
                 {
                     await ReplyErrorLocalizedAsync("user_not_found").ConfigureAwait(false);
                     return;

src/NadekoBot/Modules/Administration/VcRoleCommands.cs

@@ -41,13 +41,13 @@ namespace NadekoBot.Modules.Administration
 
                 var vc = user.VoiceChannel;
 
-                if (vc == null || vc.GuildId != user.GuildId)
+                if (vc is null || vc.GuildId != user.GuildId)
                 {
                     await ReplyErrorLocalizedAsync("must_be_in_voice").ConfigureAwait(false);
                     return;
                 }
 
-                if (role == null)
+                if (role is null)
                 {
                     if (_service.RemoveVcRole(ctx.Guild.Id, vc.Id))
                     {

src/NadekoBot/Modules/CustomReactions/CustomReactions.cs

@@ -23,7 +23,7 @@ namespace NadekoBot.Modules.CustomReactions
             _clientFactory = clientFactory;
         }
 
-        private bool AdminInGuildOrOwnerInDm() => (ctx.Guild == null && _creds.IsOwner(ctx.User))
+        private bool AdminInGuildOrOwnerInDm() => (ctx.Guild is null && _creds.IsOwner(ctx.User))
                                                   || (ctx.Guild != null && ((IGuildUser)ctx.User).GuildPermissions.Administrator);
 
         [NadekoCommand, Usage, Description, Aliases]
@@ -56,7 +56,7 @@ namespace NadekoBot.Modules.CustomReactions
             if (string.IsNullOrWhiteSpace(message) || id < 0)
                 return;
 
-            if ((channel == null && !_creds.IsOwner(ctx.User)) || (channel != null && !((IGuildUser)ctx.User).GuildPermissions.Administrator))
+            if ((channel is null && !_creds.IsOwner(ctx.User)) || (channel != null && !((IGuildUser)ctx.User).GuildPermissions.Administrator))
             {
                 await ReplyErrorLocalizedAsync("insuff_perms").ConfigureAwait(false);
                 return;
@@ -87,7 +87,7 @@ namespace NadekoBot.Modules.CustomReactions
 
             var customReactions = _service.GetCustomReactionsFor(ctx.Guild?.Id);
 
-            if (customReactions == null || !customReactions.Any())
+            if (customReactions is null || !customReactions.Any())
             {
                 await ReplyErrorLocalizedAsync("no_found").ConfigureAwait(false);
                 return;
@@ -139,7 +139,7 @@ namespace NadekoBot.Modules.CustomReactions
         {
             var found = _service.GetCustomReaction(ctx.Guild?.Id, (int)id);
 
-            if (found == null)
+            if (found is null)
             {
                 await ReplyErrorLocalizedAsync("no_found_id").ConfigureAwait(false);
                 return;

src/NadekoBot/Modules/CustomReactions/Extensions/Extensions.cs

@@ -37,7 +37,7 @@ namespace NadekoBot.Modules.CustomReactions.Extensions
 
                     var img = (elems.ElementAtOrDefault(new NadekoRandom().Next(0, elems.Length))?.Children?.FirstOrDefault() as IHtmlImageElement);
 
-                    if (img?.Source == null)
+                    if (img?.Source is null)
                         return "";
 
                     return " " + img.Source.Replace("b.", ".", StringComparison.InvariantCulture) + " ";

src/NadekoBot/Modules/CustomReactions/Services/CustomReactionsService.cs

@@ -237,7 +237,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
             using var uow = _db.GetDbContext();
             var cr = uow.CustomReactions.GetById(id);
 
-            if (cr == null || cr.GuildId != guildId)
+            if (cr is null || cr.GuildId != guildId)
                 return null;
 
             // disable allowtarget if message had target, but it was removed from it
@@ -268,7 +268,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
             if (toDelete is null)
                 return null;
             
-            if ((toDelete.IsGlobal() && guildId == null) || (guildId == toDelete.GuildId))
+            if ((toDelete.IsGlobal() && guildId is null) || (guildId == toDelete.GuildId))
             {
                 uow.CustomReactions.Remove(toDelete);
                 await uow.SaveChangesAsync();
@@ -309,7 +309,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
             if (_newGuildReactions.TryGetValue(channel.Guild.Id, out var reactions) && reactions.Length > 0)
             {
                 var cr = MatchCustomReactions(content, reactions);
-                if (!(cr is null))
+                if (cr is not null)
                     return cr;
             }
 
@@ -375,7 +375,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
                 return null;
 
             var cancelled = result.FirstOrDefault(x => x.Response == "-");
-            if (!(cancelled is null))
+            if (cancelled is not null)
                 return cancelled;
             
             return result[_rng.Next(0, result.Count)];
@@ -551,7 +551,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
             lock (_gcrWriteLock)
             {
                 var cr = Array.Find(_globalReactions, item => item.Id == id);
-                if (!(cr is null))
+                if (cr is not null)
                 {
                     return _pubSub.Pub(_gcrDeletedkey, cr.Id);
                 }
@@ -629,7 +629,7 @@ namespace NadekoBot.Modules.CustomReactions.Services
         {
             using var uow = _db.GetDbContext();
             var cr = uow.CustomReactions.GetById(id);
-            if (cr == null || cr.GuildId != guildId)
+            if (cr is null || cr.GuildId != guildId)
                 return null;
 
             return cr;

src/NadekoBot/Modules/Gambling/AnimalRacingCommands.cs

@@ -118,7 +118,7 @@ namespace NadekoBot.Modules.Gambling
 
                 var msg = raceMessage;
 
-                if (msg == null)
+                if (msg is null)
                     raceMessage = await ctx.Channel.SendConfirmAsync(text)
                         .ConfigureAwait(false);
                 else

src/NadekoBot/Modules/Gambling/Common/Blackjack/Blackjack.cs

@@ -345,7 +345,7 @@ namespace NadekoBot.Modules.Gambling.Common.Blackjack
 
         public Task PrintState()
         {
-            if (StateUpdated == null)
+            if (StateUpdated is null)
                 return Task.CompletedTask;
             return StateUpdated.Invoke(this);
         }

src/NadekoBot/Modules/Gambling/Common/Deck.cs

@@ -300,7 +300,7 @@ namespace NadekoBot.Modules.Gambling.Common
 
         public static string GetHandValue(List<Card> cards)
         {
-            if (handValues == null)
+            if (handValues is null)
                 InitHandValues();
             foreach (var kvp in handValues.Where(x => x.Value(cards)))
             {

src/NadekoBot/Modules/Gambling/Common/Events/ReactionEvent.cs

@@ -169,12 +169,12 @@ namespace NadekoBot.Modules.Gambling.Common.Events
                 if (_emote.Name != r.Emote.Name)
                     return;
                 var gu = (r.User.IsSpecified ? r.User.Value : null) as IGuildUser;
-                if (gu == null // no unknown users, as they could be bots, or alts
+                if (gu is null // no unknown users, as they could be bots, or alts
                     || msg.Id != _msg.Id // same message
                     || gu.IsBot // no bots
                     || (DateTime.UtcNow - gu.CreatedAt).TotalDays <= 5 // no recently created accounts
                     || (_noRecentlyJoinedServer && // if specified, no users who joined the server in the last 24h
-                        (gu.JoinedAt == null || (DateTime.UtcNow - gu.JoinedAt.Value).TotalDays < 1)))  // and no users for who we don't know when they joined
+                        (gu.JoinedAt is null || (DateTime.UtcNow - gu.JoinedAt.Value).TotalDays < 1)))  // and no users for who we don't know when they joined
                 {
                     return;
                 }

src/NadekoBot/Modules/Gambling/Connect4/Connect4.cs

@@ -98,7 +98,7 @@ namespace NadekoBot.Modules.Gambling.Common.Connect4
                 await _locker.WaitAsync().ConfigureAwait(false);
                 try
                 {
-                    if (_players[1] == null)
+                    if (_players[1] is null)
                     {
                         var __ = OnGameFailedToStart?.Invoke(this);
                         CurrentPhase = Phase.Ended;

src/NadekoBot/Modules/Gambling/Connect4Commands.cs

@@ -168,7 +168,7 @@ namespace NadekoBot.Modules.Gambling
                     .WithOkColor();
 
 
-                if (msg == null)
+                if (msg is null)
                     msg = await ctx.Channel.EmbedAsync(embed).ConfigureAwait(false);
                 else
                     await msg.ModifyAsync(x => x.Embed = embed.Build()).ConfigureAwait(false);

src/NadekoBot/Modules/Gambling/DrawCommands.cs

@@ -33,7 +33,7 @@ namespace NadekoBot.Modules.Gambling
                 if (num < 1 || num > 10)
                     throw new ArgumentOutOfRangeException(nameof(num));
 
-                Deck cards = guildId == null ? new Deck() : _allDecks.GetOrAdd(ctx.Guild, (s) => new Deck());
+                Deck cards = guildId is null ? new Deck() : _allDecks.GetOrAdd(ctx.Guild, (s) => new Deck());
                 var images = new List<Image<Rgba32>>();
                 var cardObjects = new List<Deck.Card>();
                 for (var i = 0; i < num; i++)

src/NadekoBot/Modules/Gambling/Gambling.cs

@@ -413,7 +413,7 @@ namespace NadekoBot.Modules.Gambling
 --
 ";
 
-                if (rdMsg == null)
+                if (rdMsg is null)
                 {
                     rdMsg = await ctx.Channel.EmbedAsync(embed)
                         .ConfigureAwait(false);

src/NadekoBot/Modules/Gambling/Services/CurrencyEventsService.cs

@@ -92,7 +92,7 @@ namespace NadekoBot.Modules.Gambling.Services
         {
             SocketGuild g = _client.GetGuild(guildId);
             SocketTextChannel ch = g?.GetChannel(channelId) as SocketTextChannel;
-            if (ch == null)
+            if (ch is null)
                 return false;
 
             ICurrencyEvent ce;

src/NadekoBot/Modules/Gambling/Services/PlantPickService.cs

@@ -182,7 +182,7 @@ namespace NadekoBot.Modules.Gambling.Services
         private Task PotentialFlowerGeneration(IUserMessage imsg)
         {
             var msg = imsg as SocketUserMessage;
-            if (msg == null || msg.Author.IsBot)
+            if (msg is null || msg.Author.IsBot)
                 return Task.CompletedTask;
 
             if (!(imsg.Channel is ITextChannel channel))
@@ -351,7 +351,7 @@ namespace NadekoBot.Modules.Gambling.Services
             {
                 // try to send the message with the currency image
                 var msgId = await SendPlantMessageAsync(gid, ch, user, amount, pass).ConfigureAwait(false);
-                if (msgId == null)
+                if (msgId is null)
                 {
                     // if it fails it will return null, if it returns null, refund
                     await _cs.AddAsync(uid, "Planted currency refund", amount, gamble: false);

src/NadekoBot/Modules/Gambling/Services/WaifuService.cs

@@ -49,7 +49,7 @@ namespace NadekoBot.Modules.Gambling.Services
                 var ownerUser = uow.GetOrCreateUser(owner);
 
                 // owner has to be the owner of the waifu
-                if (waifu == null || waifu.ClaimerId != ownerUser.Id)
+                if (waifu is null || waifu.ClaimerId != ownerUser.Id)
                     return false;
                 
                 // if waifu likes the person, gotta pay the penalty
@@ -97,7 +97,7 @@ namespace NadekoBot.Modules.Gambling.Services
             {
                 var waifu = uow.WaifuInfo.ByWaifuUserId(user.Id);
 
-                if (waifu == null)
+                if (waifu is null)
                     return settings.Waifu.MinPrice;
 
                 var divorces = uow.WaifuUpdates.Count(x => x.Old != null &&
@@ -168,7 +168,7 @@ namespace NadekoBot.Modules.Gambling.Services
             {
                 w = uow.WaifuInfo.ByWaifuUserId(target.Id);
                 isAffinity = (w?.Affinity?.UserId == user.Id);
-                if (w == null)
+                if (w is null)
                 {
                     var claimer = uow.GetOrCreateUser(user);
                     var waifu = uow.GetOrCreateUser(target);
@@ -257,14 +257,14 @@ namespace NadekoBot.Modules.Gambling.Services
             using (var uow = _db.GetDbContext())
             {
                 var w = uow.WaifuInfo.ByWaifuUserId(user.Id);
-                var newAff = target == null ? null : uow.GetOrCreateUser(target);
+                var newAff = target is null ? null : uow.GetOrCreateUser(target);
                 if (w?.Affinity?.UserId == target?.Id)
                 {
                 }
                 else if (!_cache.TryAddAffinityCooldown(user.Id, out remaining))
                 {
                 }
-                else if (w == null)
+                else if (w is null)
                 {
                     var thisUser = uow.GetOrCreateUser(user);
                     uow.WaifuInfo.Add(new WaifuInfo()
@@ -330,7 +330,7 @@ namespace NadekoBot.Modules.Gambling.Services
             {
                 w = uow.WaifuInfo.ByWaifuUserId(targetId);
                 var now = DateTime.UtcNow;
-                if (w?.Claimer == null || w.Claimer.UserId != user.Id)
+                if (w?.Claimer is null || w.Claimer.UserId != user.Id)
                     result = DivorceResult.NotYourWife;
                 else if (!_cache.TryAddDivorceCooldown(user.Id, out remaining))
                 {
@@ -383,7 +383,7 @@ namespace NadekoBot.Modules.Gambling.Services
                 var w = uow.WaifuInfo.ByWaifuUserId(giftedWaifu.Id, 
                     set => set.Include(x => x.Items)
                         .Include(x => x.Claimer));
-                if (w == null)
+                if (w is null)
                 {
                     uow.WaifuInfo.Add(w = new WaifuInfo()
                     {

src/NadekoBot/Modules/Gambling/ShopCommands.cs

@@ -104,7 +104,7 @@ namespace NadekoBot.Modules.Gambling
                     uow.SaveChanges();
                 }
 
-                if (entry == null)
+                if (entry is null)
                 {
                     await ReplyErrorLocalizedAsync("shop_item_not_found").ConfigureAwait(false);
                     return;
@@ -115,7 +115,7 @@ namespace NadekoBot.Modules.Gambling
                     var guser = (IGuildUser)ctx.User;
                     var role = ctx.Guild.GetRole(entry.RoleId);
 
-                    if (role == null)
+                    if (role is null)
                     {
                         await ReplyErrorLocalizedAsync("shop_role_not_found").ConfigureAwait(false);
                         return;
@@ -306,7 +306,7 @@ namespace NadekoBot.Modules.Gambling
                         }
                     }
                 }
-                if (entry == null)
+                if (entry is null)
                     await ReplyErrorLocalizedAsync("shop_item_not_found").ConfigureAwait(false);
                 else if (!rightType)
                     await ReplyErrorLocalizedAsync("shop_item_wrong_type").ConfigureAwait(false);
@@ -341,7 +341,7 @@ namespace NadekoBot.Modules.Gambling
                     }
                 }
 
-                if (removed == null)
+                if (removed is null)
                     await ReplyErrorLocalizedAsync("shop_item_not_found").ConfigureAwait(false);
                 else
                     await ctx.Channel.EmbedAsync(EntryToEmbed(removed)

src/NadekoBot/Modules/Gambling/WaifuClaimCommands.cs

@@ -187,11 +187,11 @@ namespace NadekoBot.Modules.Gambling
                     }
                     return;
                 }
-                if (u == null)
+                if (u is null)
                 {
                     await ReplyConfirmLocalizedAsync("waifu_affinity_reset");
                 }
-                else if (oldAff == null)
+                else if (oldAff is null)
                 {
                     await ReplyConfirmLocalizedAsync("waifu_affinity_set", Format.Bold(u.ToString()));
                 }
@@ -240,7 +240,7 @@ namespace NadekoBot.Modules.Gambling
             [Priority(1)]
             public Task WaifuInfo([Leftover]IUser target = null)
             {
-                if (target == null)
+                if (target is null)
                     target = ctx.User;
 
                 return InternalWaifuInfo(target.Id, target.ToString());

src/NadekoBot/Modules/Games/Common/PollRunner.cs

@@ -32,7 +32,7 @@ namespace NadekoBot.Modules.Games.Common
             {
                 // has to be a user message
                 // channel must be the same the poll started in
-                if (msg == null || msg.Author.IsBot || msg.Channel.Id != Poll.ChannelId)
+                if (msg is null || msg.Author.IsBot || msg.Channel.Id != Poll.ChannelId)
                     return false;
 
                 // has to be an integer
@@ -43,7 +43,7 @@ namespace NadekoBot.Modules.Games.Common
                     return false;
 
                 var usr = msg.Author as IGuildUser;
-                if (usr == null)
+                if (usr is null)
                     return false;
 
                 voteObj = new PollVote()

src/NadekoBot/Modules/Games/Common/TicTacToe.cs

@@ -81,7 +81,7 @@ namespace NadekoBot.Modules.Games.Common
             {
                 for (var j = 0; j < _state.GetLength(1); j++)
                 {
-                    sb.Append(_state[i, j] == null ? _numbers[i * 3 + j] : GetIcon(_state[i, j]));
+                    sb.Append(_state[i, j] is null ? _numbers[i * 3 + j] : GetIcon(_state[i, j]));
                     if (j < _state.GetLength(1) - 1)
                         sb.Append("┃");
                 }
@@ -102,7 +102,7 @@ namespace NadekoBot.Modules.Games.Common
             if (!string.IsNullOrWhiteSpace(title))
                 embed.WithTitle(title);
 
-            if (_winner == null)
+            if (_winner is null)
             {
                 if (_phase == Phase.Ended)
                     embed.WithFooter(efb => efb.WithText(GetText("ttt_no_moves")));
@@ -192,7 +192,7 @@ namespace NadekoBot.Modules.Games.Common
             {
                 for (var j = 0; j < 3; j++)
                 {
-                    if (_state[i, j] == null)
+                    if (_state[i, j] is null)
                         return false;
                 }
             }
@@ -213,7 +213,7 @@ namespace NadekoBot.Modules.Games.Common
                     if (int.TryParse(msg.Content, out var index) &&
                         --index >= 0 &&
                         index <= 9 &&
-                        _state[index / 3, index % 3] == null)
+                        _state[index / 3, index % 3] is null)
                     {
                         _state[index / 3, index % 3] = _curUserIndex;
 

src/NadekoBot/Modules/Games/Common/Trivia/TriviaGame.cs

@@ -210,7 +210,7 @@ namespace NadekoBot.Modules.Games.Common.Trivia
                     var umsg = imsg as SocketUserMessage;
 
                     var textChannel = umsg?.Channel as ITextChannel;
-                    if (textChannel == null || textChannel.Guild != Guild)
+                    if (textChannel is null || textChannel.Guild != Guild)
                         return;
 
                     var guildUser = (IGuildUser)umsg.Author;

src/NadekoBot/Modules/Games/Common/TypingGame.cs

@@ -143,10 +143,10 @@ namespace NadekoBot.Modules.Games.Common
                     if (imsg.Author.IsBot)
                         return;
                     var msg = imsg as SocketUserMessage;
-                    if (msg == null)
+                    if (msg is null)
                         return;
 
-                    if (this.Channel == null || this.Channel.Id != msg.Channel.Id) return;
+                    if (this.Channel is null || this.Channel.Id != msg.Channel.Id) return;
 
                     var guess = msg.Content;
 

src/NadekoBot/Modules/Games/Games.cs

@@ -61,7 +61,7 @@ namespace NadekoBot.Modules.Games
             var gr = _service.GirlRatings.GetOrAdd(usr.Id, GetGirl);
             var originalStream = await gr.Stream;
 
-            if (originalStream == null)
+            if (originalStream is null)
             {
                 await ReplyErrorLocalizedAsync("something_went_wrong").ConfigureAwait(false);
                 return;

src/NadekoBot/Modules/Games/HangmanCommands.cs

@@ -85,7 +85,7 @@ namespace NadekoBot.Modules.Games
 
             Task Hm_OnGameEnded(Hangman game, string winner)
             {
-                if (winner == null)
+                if (winner is null)
                 {
                     var loseEmbed = new EmbedBuilder().WithTitle($"Hangman Game ({game.TermType}) - Ended")
                                              .WithDescription(Format.Bold("You lose."))

src/NadekoBot/Modules/Games/NunchiCommands.cs

@@ -89,7 +89,7 @@ namespace NadekoBot.Modules.Games
                         game.Dispose();
                     }
 
-                    if (arg2 == null)
+                    if (arg2 is null)
                         return ConfirmLocalizedAsync("nunchi_ended_no_winner", Format.Bold(arg2));
                     else
                         return ConfirmLocalizedAsync("nunchi_ended", Format.Bold(arg2));

src/NadekoBot/Modules/Games/PollCommands.cs

@@ -33,7 +33,7 @@ namespace NadekoBot.Modules.Games
 
                 var poll = _service.CreatePoll(ctx.Guild.Id,
                     ctx.Channel.Id, arg);
-                if(poll == null)
+                if(poll is null)
                 {
                     await ReplyErrorLocalizedAsync("poll_invalid_input").ConfigureAwait(false);
                     return;
@@ -75,7 +75,7 @@ namespace NadekoBot.Modules.Games
                 var channel = (ITextChannel)ctx.Channel;
 
                 Poll p;
-                if ((p = _service.StopPoll(ctx.Guild.Id)) == null)
+                if ((p = _service.StopPoll(ctx.Guild.Id)) is null)
                     return;
 
                 var embed = GetStats(p, GetText("poll_closed"));

src/NadekoBot/Modules/Games/Services/ChatterbotService.cs

@@ -59,7 +59,7 @@ namespace NadekoBot.Modules.Games.Services
             var channel = msg.Channel as ITextChannel;
             cleverbot = null;
 
-            if (channel == null)
+            if (channel is null)
                 return null;
 
             if (!ChatterBotGuilds.TryGetValue(channel.Guild.Id, out Lazy<IChatterBotSession> lazyCleverbot))
@@ -110,7 +110,7 @@ namespace NadekoBot.Modules.Games.Services
             try
             {
                 var message = PrepareMessage(usrMsg, out IChatterBotSession cbs);
-                if (message == null || cbs == null)
+                if (message is null || cbs is null)
                     return false;
 
                 var pc = _perms.GetCacheFor(guild.Id);

src/NadekoBot/Modules/Games/Services/PollService.cs

@@ -108,7 +108,7 @@ namespace NadekoBot.Modules.Games.Services
 
         public async Task<bool> RunBehavior(DiscordSocketClient client, IGuild guild, IUserMessage msg)
         {
-            if (guild == null)
+            if (guild is null)
                 return false;
 
             if (!ActivePolls.TryGetValue(guild.Id, out var poll))

src/NadekoBot/Modules/Help/Help.cs

@@ -268,7 +268,7 @@ namespace NadekoBot.Modules.Help
         {
             var channel = ctx.Channel;
 
-            if (com == null)
+            if (com is null)
             {
                 IMessageChannel ch = channel is ITextChannel
                     ? await ((IGuildUser)ctx.User).GetOrCreateDMChannelAsync().ConfigureAwait(false)

src/NadekoBot/Modules/Help/Services/HelpService.cs

@@ -43,7 +43,7 @@ namespace NadekoBot.Modules.Help.Services
         public Task LateExecute(DiscordSocketClient client, IGuild guild, IUserMessage msg)
         {
             var settings = _bss.Data;
-            if (guild == null)
+            if (guild is null)
             {
                 if (string.IsNullOrWhiteSpace(settings.DmHelpText) || settings.DmHelpText == "-")
                     return Task.CompletedTask;
@@ -136,7 +136,7 @@ namespace NadekoBot.Modules.Help.Services
                 .FirstOrDefault(ca => ca is UserPermAttribute);
 
             string userPermString = string.Empty;
-            if (!(userPerm is null))
+            if (userPerm is not null)
             {
                 if (userPerm.UserPermissionAttribute.ChannelPermission is ChannelPermission cPerm)
                     userPermString = GetPreconditionString((ChannelPerm) cPerm);

src/NadekoBot/Modules/Music/Common/Resolvers/LocalTrackResolver.cs

@@ -64,7 +64,7 @@ namespace NadekoBot.Modules.Music.Resolvers
                 yield break;
             
             var firstData = await ResolveByQueryAsync(firstFile);
-            if (!(firstData is null))
+            if (firstData is not null)
                 yield return firstData;
 
             var fileChunks = files.Skip(1).Chunk(10);

src/NadekoBot/Modules/Music/Common/Resolvers/SoundcloudResolver.cs

@@ -81,7 +81,7 @@ namespace NadekoBot.Modules.Music.Resolvers
         public async Task<ITrackInfo?> ResolveByQueryAsync(string query)
         {
             var cached = await _trackCacher.GetCachedDataByQueryAsync(query, MusicPlatform.SoundCloud);
-            if (!(cached is null))
+            if (cached is not null)
                 return CachableDataToTrackInfo(cached);
             
             var svideo = !IsSoundCloudLink(query)

src/NadekoBot/Modules/Music/Common/_OldMusicPlayer.cs

@@ -199,7 +199,7 @@
 //                         //Log.Information("Buffered. Getting audio client...");
 //                         var ac = await GetAudioClient().ConfigureAwait(false);
 //                         Log.Information("Got Audio client");
-//                         if (ac == null)
+//                         if (ac is null)
 //                         {
 //                             Log.Information("Can't join");
 //                             await Task.Delay(900, cancelToken).ConfigureAwait(false);
@@ -371,7 +371,7 @@
 //
 //         private async Task<IAudioClient> GetAudioClient(bool reconnect = false)
 //         {
-//             if (_audioClient == null ||
+//             if (_audioClient is null ||
 //                 _audioClient.ConnectionState != ConnectionState.Connected ||
 //                 reconnect ||
 //                 newVoiceChannel)
@@ -529,7 +529,7 @@
 //         {
 //             lock (locker)
 //             {
-//                 if (PauseTaskSource == null)
+//                 if (PauseTaskSource is null)
 //                     PauseTaskSource = new TaskCompletionSource<bool>();
 //                 else
 //                 {

src/NadekoBot/Modules/Music/Common/_OldMusicQueue.cs

@@ -86,7 +86,7 @@
 //                 if (MaxQueueSize != 0 && Songs.Count >= MaxQueueSize)
 //                     throw new QueueFullException();
 //                 var curSong = Current.Song;
-//                 if (curSong == null)
+//                 if (curSong is null)
 //                 {
 //                     Songs.AddLast(song);
 //                     return Songs.Count;

src/NadekoBot/Modules/Music/Music.cs

@@ -285,7 +285,7 @@ namespace NadekoBot.Modules.Music
             {
                 string desc = string.Empty;
                 var current = mp.GetCurrentTrack(out var currentIndex);
-                if (!(current is null))
+                if (current is not null)
                 {
                     desc = $"`🔊` {current.PrettyFullName()}\n\n" + desc;
                 }
@@ -371,7 +371,7 @@ namespace NadekoBot.Modules.Music
             try
             {
                 var input = await GetUserInputAsync(ctx.User.Id, ctx.Channel.Id).ConfigureAwait(false);
-                if (input == null
+                if (input is null
                     || !int.TryParse(input, out var index)
                     || (index -= 1) < 0
                     || index >= videos.Count)
@@ -699,7 +699,7 @@ namespace NadekoBot.Modules.Music
              }
 
              var currentTrack = mp.GetCurrentTrack(out _);
-             if (currentTrack == null)
+             if (currentTrack is null)
                  return;
 
              var embed = new EmbedBuilder().WithOkColor()

src/NadekoBot/Modules/Music/PlaylistCommands.cs

@@ -213,7 +213,7 @@ namespace NadekoBot.Modules.Music
                         mpl = uow.MusicPlaylists.GetWithSongs(id);
                     }
 
-                    if (mpl == null)
+                    if (mpl is null)
                     {
                         await ReplyErrorLocalizedAsync("playlist_id_not_found").ConfigureAwait(false);
                         return;

src/NadekoBot/Modules/Music/Services/MusicService.cs

@@ -313,7 +313,7 @@ namespace NadekoBot.Modules.Music.Services
             {
                 var randomPlayingTrack = _players
                     .Select(x => x.Value.GetCurrentTrack(out _))
-                    .Where(x => !(x is null))
+                    .Where(x => x is not null)
                     .Shuffle()
                     .FirstOrDefault();
 
@@ -328,7 +328,7 @@ namespace NadekoBot.Modules.Music.Services
             {
                 var count = _players
                     .Select(x => x.Value.GetCurrentTrack(out _))
-                    .Count(x => !(x is null));
+                    .Count(x => x is not null);
 
                 return count.ToString();
             });

src/NadekoBot/Modules/Music/Services/_OldMusicService.cs

@@ -100,7 +100,7 @@
 //             string GetText(string text, params object[] replacements) =>
 //                 _strings.GetText(text, textCh.Guild.Id, replacements);
 //             
-//             if (voiceCh == null || voiceCh.Guild != textCh.Guild)
+//             if (voiceCh is null || voiceCh.Guild != textCh.Guild)
 //             {
 //                 if (textCh != null)
 //                 {
@@ -139,7 +139,7 @@
 //                         }
 //
 //                         var (Index, Current) = mp.Current;
-//                         if (Current == null
+//                         if (Current is null
 //                             && !mp.RepeatCurrentSong
 //                             && !mp.RepeatPlaylist
 //                             && !mp.FairPlay
@@ -161,7 +161,7 @@
 //                     //    // ignored
 //                     //}
 //                     var sender = player;
-//                     if (sender == null)
+//                     if (sender is null)
 //                         return;
 //                     try
 //                     {
@@ -215,7 +215,7 @@
 //                 return;
 //
 //             var si = await ResolveSong(related[new NadekoRandom().Next(related.Length)], _client.CurrentUser.ToString(), MusicType.YouTube).ConfigureAwait(false);
-//             if (si == null)
+//             if (si is null)
 //                 throw new SongNotFoundException();
 //             var mp = await GetOrCreatePlayer(txtCh.GuildId, vch, txtCh).ConfigureAwait(false);
 //             mp.Enqueue(si);
@@ -229,7 +229,7 @@
 //             var strategy = await resolverFactory.GetResolveStrategy(query, musicType).ConfigureAwait(false);
 //             var sinfo = await strategy.ResolveSong(query).ConfigureAwait(false);
 //
-//             if (sinfo == null)
+//             if (sinfo is null)
 //                 return null;
 //
 //             sinfo.QueuerName = queuerName;

src/NadekoBot/Modules/Music/_OldMusic.cs

@@ -51,13 +51,13 @@
 //         //    var t = Task.Run(() =>
 //         //    {
 //         //        var usr = iusr as SocketGuildUser;
-//         //        if (usr == null ||
+//         //        if (usr is null ||
 //         //            oldState.VoiceChannel == newState.VoiceChannel)
 //         //            return;
 //
 //         //        var player = _music.GetPlayerOrDefault(usr.Guild.Id);
 //
-//         //        if (player == null)
+//         //        if (player is null)
 //         //            return;
 //
 //         //        try
@@ -97,7 +97,7 @@
 //
 //         private async Task InternalQueue(MusicPlayer mp, SongInfo songInfo, bool silent, bool queueFirst = false, bool forcePlay = false)
 //         {
-//             if (songInfo == null)
+//             if (songInfo is null)
 //             {
 //                 if (!silent)
 //                     await ReplyErrorLocalizedAsync("song_not_found").ConfigureAwait(false);
@@ -216,7 +216,7 @@
 //             try
 //             {
 //                 var input = await GetUserInputAsync(ctx.User.Id, ctx.Channel.Id).ConfigureAwait(false);
-//                 if (input == null
+//                 if (input is null
 //                     || !int.TryParse(input, out var index)
 //                     || (index -= 1) < 0
 //                     || index >= videos.Length)
@@ -436,7 +436,7 @@
 //         public async Task SongRemove(All _)
 //         {
 //             var mp = _service.GetPlayerOrDefault(ctx.Guild.Id);
-//             if (mp == null)
+//             if (mp is null)
 //                 return;
 //             mp.Stop(true);
 //             await ReplyConfirmLocalizedAsync("queue_cleared").ConfigureAwait(false);
@@ -576,7 +576,7 @@
 //                     mpl = uow.MusicPlaylists.GetWithSongs(id);
 //                 }
 //
-//                 if (mpl == null)
+//                 if (mpl is null)
 //                 {
 //                     await ReplyErrorLocalizedAsync("playlist_id_not_found").ConfigureAwait(false);
 //                     return;
@@ -700,7 +700,7 @@
 //         {
 //             var mp = await _service.GetOrCreatePlayer(Context).ConfigureAwait(false);
 //             var (_, currentSong) = mp.Current;
-//             if (currentSong == null)
+//             if (currentSong is null)
 //                 return;
 //             try { await mp.UpdateSongDurationsAsync().ConfigureAwait(false); } catch { }
 //
@@ -744,7 +744,7 @@
 //                 Log.Warning(ex.Message);
 //             }
 //
-//             if (plId == null)
+//             if (plId is null)
 //             {
 //                 await ReplyErrorLocalizedAsync("no_search_results").ConfigureAwait(false);
 //                 return;
@@ -834,12 +834,12 @@
 //         {
 //             var vch = ((IGuildUser)ctx.User).VoiceChannel;
 //
-//             if (vch == null)
+//             if (vch is null)
 //                 return;
 //
 //             var mp = _service.GetPlayerOrDefault(ctx.Guild.Id);
 //
-//             if (mp == null)
+//             if (mp is null)
 //                 return;
 //
 //             await mp.SetVoiceChannel(vch).ConfigureAwait(false);
@@ -853,7 +853,7 @@
 //                 return;
 //
 //             MusicPlayer mp = _service.GetPlayerOrDefault(ctx.Guild.Id);
-//             if (mp == null)
+//             if (mp is null)
 //                 return;
 //
 //             fromto = fromto?.Trim();
@@ -862,7 +862,7 @@
 //             SongInfo s;
 //             if (fromtoArr.Length != 2 || !int.TryParse(fromtoArr[0], out var n1) ||
 //                 !int.TryParse(fromtoArr[1], out var n2) || n1 < 1 || n2 < 1 || n1 == n2
-//                 || (s = mp.MoveSong(--n1, --n2)) == null)
+//                 || (s = mp.MoveSong(--n1, --n2)) is null)
 //             {
 //                 await ReplyConfirmLocalizedAsync("invalid_input").ConfigureAwait(false);
 //                 return;
@@ -916,7 +916,7 @@
 //         {
 //             var mp = await _service.GetOrCreatePlayer(Context).ConfigureAwait(false);
 //             var (_, currentSong) = mp.Current;
-//             if (currentSong == null)
+//             if (currentSong is null)
 //                 return;
 //             var currentValue = mp.ToggleRepeatSong();
 //

src/NadekoBot/Modules/Nsfw/Nsfw.cs

@@ -55,13 +55,13 @@ namespace NadekoBot.Modules.NSFW
                 img = await _service.DapiSearch(tag, type, ctx.Guild?.Id, true).ConfigureAwait(false);
                 // if i can't find the image, ran out of providers, or tag is blacklisted
                 // return the error
-                if (img == null && !listOfProviders.Any())
+                if (img is null && !listOfProviders.Any())
                 {
                     await ReplyErrorLocalizedAsync("no_results").ConfigureAwait(false);
                     return;
                 }
 
-            } while (img == null);
+            } while (img is null);
 
             await channel.EmbedAsync(new EmbedBuilder().WithOkColor()
                 .WithImageUrl(img.FileUrl)
@@ -129,7 +129,7 @@ namespace NadekoBot.Modules.NSFW
             {
                 try
                 {
-                    if (tagsArr == null || tagsArr.Length == 0)
+                    if (tagsArr is null || tagsArr.Length == 0)
                         await InternalHentai(ctx.Channel, null).ConfigureAwait(false);
                     else
                         await InternalHentai(ctx.Channel, tagsArr[new NadekoRandom().Next(0, tagsArr.Length)]).ConfigureAwait(false);
@@ -252,7 +252,7 @@ namespace NadekoBot.Modules.NSFW
                                                 _service.DapiSearch(tag, DapiSearchType.Yandere, ctx.Guild?.Id, true)).ConfigureAwait(false);
 
                 var linksEnum = images?.Where(l => l != null).ToArray();
-                if (images == null || !linksEnum.Any())
+                if (images is null || !linksEnum.Any())
                 {
                     await ReplyErrorLocalizedAsync("no_results").ConfigureAwait(false);
                     return;
@@ -439,7 +439,7 @@ namespace NadekoBot.Modules.NSFW
 
             imgObj = await _service.DapiSearch(tag, type, ctx.Guild?.Id, forceExplicit).ConfigureAwait(false);
 
-            if (imgObj == null)
+            if (imgObj is null)
                 await ReplyErrorLocalizedAsync("no_results").ConfigureAwait(false);
             else
             {

src/NadekoBot/Modules/Permissions/Common/PermissionExtensions.cs

@@ -19,7 +19,7 @@ namespace NadekoBot.Modules.Permissions.Common
 
                 var result = perm.CheckPermission(message, commandName, moduleName);
 
-                if (result == null)
+                if (result is null)
                 {
                     continue;
                 }
@@ -55,13 +55,13 @@ namespace NadekoBot.Modules.Permissions.Common
                         return perm.State;
                     break;
                 case PrimaryPermissionType.Role:        
-                    if (guildUser == null)
+                    if (guildUser is null)
                         break;
                     if (guildUser.RoleIds.Contains(perm.PrimaryTargetId))
                         return perm.State;
                     break;
                 case PrimaryPermissionType.Server:
-                    if (guildUser == null)
+                    if (guildUser is null)
                         break;
                     return perm.State;
             }

src/NadekoBot/Modules/Permissions/FilterCommands.cs

@@ -77,7 +77,7 @@ namespace NadekoBot.Modules.Permissions
                     };
                     removed = config.FilterInvitesChannelIds.FirstOrDefault(fc => fc.Equals(match));
 
-                    if (removed == null)
+                    if (removed is null)
                     {
                         config.FilterInvitesChannelIds.Add(match);
                     }
@@ -88,7 +88,7 @@ namespace NadekoBot.Modules.Permissions
                     await uow.SaveChangesAsync();
                 }
 
-                if (removed == null)
+                if (removed is null)
                 {
                     _service.InviteFilteringChannels.Add(channel.Id);
                     await ReplyConfirmLocalizedAsync("invite_filter_channel_on").ConfigureAwait(false);
@@ -142,7 +142,7 @@ namespace NadekoBot.Modules.Permissions
                     };
                     removed = config.FilterLinksChannelIds.FirstOrDefault(fc => fc.Equals(match));
 
-                    if (removed == null)
+                    if (removed is null)
                     {
                         config.FilterLinksChannelIds.Add(match);
                     }
@@ -153,7 +153,7 @@ namespace NadekoBot.Modules.Permissions
                     await uow.SaveChangesAsync();
                 }
 
-                if (removed == null)
+                if (removed is null)
                 {
                     _service.LinkFilteringChannels.Add(channel.Id);
                     await ReplyConfirmLocalizedAsync("link_filter_channel_on").ConfigureAwait(false);
@@ -207,7 +207,7 @@ namespace NadekoBot.Modules.Permissions
                         ChannelId = channel.Id
                     };
                     removed = config.FilterWordsChannelIds.FirstOrDefault(fc => fc.Equals(match));
-                    if (removed == null)
+                    if (removed is null)
                     {
                         config.FilterWordsChannelIds.Add(match);
                     }
@@ -218,7 +218,7 @@ namespace NadekoBot.Modules.Permissions
                     await uow.SaveChangesAsync();
                 }
 
-                if (removed == null)
+                if (removed is null)
                 {
                     _service.WordFilteringChannels.Add(channel.Id);
                     await ReplyConfirmLocalizedAsync("word_filter_channel_on").ConfigureAwait(false);
@@ -248,7 +248,7 @@ namespace NadekoBot.Modules.Permissions
 
                     removed = config.FilteredWords.FirstOrDefault(fw => fw.Word.Trim().ToLowerInvariant() == word);
 
-                    if (removed == null)
+                    if (removed is null)
                         config.FilteredWords.Add(new FilteredWord() { Word = word });
                     else
                     {
@@ -260,7 +260,7 @@ namespace NadekoBot.Modules.Permissions
 
                 var filteredWords = _service.ServerFilteredWords.GetOrAdd(channel.Guild.Id, new ConcurrentHashSet<string>());
 
-                if (removed == null)
+                if (removed is null)
                 {
                     filteredWords.Add(word);
                     await ReplyConfirmLocalizedAsync("filter_word_add", Format.Code(word)).ConfigureAwait(false);

src/NadekoBot/Modules/Permissions/Permissions.cs

@@ -33,7 +33,7 @@ namespace NadekoBot.Modules.Permissions
             using (var uow = _db.GetDbContext())
             {
                 var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
-                if (action == null) action = new PermissionAction(!config.VerbosePermissions); // New behaviour, can toggle.
+                if (action is null) action = new PermissionAction(!config.VerbosePermissions); // New behaviour, can toggle.
                 config.VerbosePermissions = action.Value;
                 await uow.SaveChangesAsync();
                 _service.UpdateCache(config);
@@ -57,11 +57,11 @@ namespace NadekoBot.Modules.Permissions
             if (role != null && role == role.Guild.EveryoneRole)
                 return;
             
-            if (role == null)
+            if (role is null)
             {
                 var cache = _service.GetCacheFor(ctx.Guild.Id);
                 if (!ulong.TryParse(cache.PermRole, out var roleId) ||
-                    (role = ((SocketGuild)ctx.Guild).GetRole(roleId)) == null)
+                    (role = ((SocketGuild)ctx.Guild).GetRole(roleId)) is null)
                 {
                     await ReplyConfirmLocalizedAsync("permrole_not_set", Format.Bold(cache.PermRole)).ConfigureAwait(false);
                 }

src/NadekoBot/Modules/Permissions/Services/BlacklistService.cs

@@ -89,7 +89,7 @@ namespace NadekoBot.Modules.Permissions.Services
             var toRemove = uow.Blacklist
                 .FirstOrDefault(bi => bi.ItemId == id && bi.Type == type);
             
-            if (!(toRemove is null))
+            if (toRemove is not null)
                 uow.Blacklist.Remove(toRemove);
             
             uow.SaveChanges();

src/NadekoBot/Modules/Permissions/Services/FilterService.cs

@@ -114,7 +114,7 @@ namespace NadekoBot.Modules.Permissions.Services
                     var guild = (channel as ITextChannel)?.Guild;
                     var usrMsg = newMsg as IUserMessage;
 
-                    if (guild == null || usrMsg == null)
+                    if (guild is null || usrMsg is null)
                         return Task.CompletedTask;
 
                     return RunBehavior(null, guild, usrMsg);

src/NadekoBot/Modules/Permissions/Services/PermissionsService.cs

@@ -59,7 +59,7 @@ namespace NadekoBot.Modules.Permissions.Services
                     UpdateCache(config);
                 }
                 Cache.TryGetValue(guildId, out pc);
-                if (pc == null)
+                if (pc is null)
                     throw new Exception("Cache is null.");
             }
             return pc;
@@ -108,7 +108,7 @@ namespace NadekoBot.Modules.Permissions.Services
             var commandName = command.Name.ToLowerInvariant();
             
             await Task.Yield();
-            if (guild == null)
+            if (guild is null)
             {
                 return false;
             }
@@ -149,7 +149,7 @@ namespace NadekoBot.Modules.Permissions.Services
                         rid = 0;
                     string returnMsg;
                     IRole role;
-                    if (string.IsNullOrWhiteSpace(permRole) || (role = guild.GetRole(rid)) == null)
+                    if (string.IsNullOrWhiteSpace(permRole) || (role = guild.GetRole(rid)) is null)
                     {
                         returnMsg = $"You need Admin permissions in order to use permission commands.";
                         if (pc.Verbose)

src/NadekoBot/Modules/Searches/AnimeSearchCommands.cs

@@ -24,7 +24,7 @@ namespace NadekoBot.Modules.Searches
 
                 var novelData = await _service.GetNovelData(query).ConfigureAwait(false);
 
-                if (novelData == null)
+                if (novelData is null)
                 {
                     await ReplyErrorLocalizedAsync("failed_finding_novel").ConfigureAwait(false);
                     return;
@@ -63,7 +63,7 @@ namespace NadekoBot.Modules.Searches
                     var favorites = document.QuerySelectorAll("div.user-favorites > div.di-tc");
 
                     var favAnime = GetText("anime_no_fav");
-                    if (favorites.Length > 0 && favorites[0].QuerySelector("p") == null)
+                    if (favorites.Length > 0 && favorites[0].QuerySelector("p") is null)
                         favAnime = string.Join("\n", favorites[0].QuerySelectorAll("ul > li > div.di-tc.va-t > a")
                            .Shuffle()
                            .Take(3)
@@ -144,7 +144,7 @@ namespace NadekoBot.Modules.Searches
 
                 var animeData = await _service.GetAnimeData(query).ConfigureAwait(false);
 
-                if (animeData == null)
+                if (animeData is null)
                 {
                     await ReplyErrorLocalizedAsync("failed_finding_anime").ConfigureAwait(false);
                     return;
@@ -172,7 +172,7 @@ namespace NadekoBot.Modules.Searches
 
                 var mangaData = await _service.GetMangaData(query).ConfigureAwait(false);
 
-                if (mangaData == null)
+                if (mangaData is null)
                 {
                     await ReplyErrorLocalizedAsync("failed_finding_manga").ConfigureAwait(false);
                     return;

src/NadekoBot/Modules/Searches/CryptoCommands.cs

@@ -32,7 +32,7 @@ namespace NadekoBot.Modules.Searches
                     }
                 }
 
-                if (crypto == null)
+                if (crypto is null)
                 {
                     await ReplyErrorLocalizedAsync("crypto_not_found").ConfigureAwait(false);
                     return;

src/NadekoBot/Modules/Searches/Searches.cs

@@ -51,7 +51,7 @@ namespace NadekoBot.Modules.Searches
         public async Task Rip([Leftover] IGuildUser usr)
         {
             var av = usr.RealAvatarUrl(128);
-            if (av == null)
+            if (av is null)
                 return;
             using (var picStream = await _service.GetRipPictureAsync(usr.Nickname ?? usr.Username, av).ConfigureAwait(false))
             {
@@ -73,7 +73,7 @@ namespace NadekoBot.Modules.Searches
             var embed = new EmbedBuilder();
             var data = await _service.GetWeatherDataAsync(query).ConfigureAwait(false);
 
-            if (data == null)
+            if (data is null)
             {
                 embed.WithDescription(GetText("city_not_found"))
                     .WithErrorColor();
@@ -115,7 +115,7 @@ namespace NadekoBot.Modules.Searches
             await ctx.Channel.TriggerTypingAsync().ConfigureAwait(false);
 
             var (data, err) = await _service.GetTimeDataAsync(query).ConfigureAwait(false);
-            if (!(err is null))
+            if (err is not null)
             {
                 string errorKey;
                 switch (err)
@@ -177,7 +177,7 @@ namespace NadekoBot.Modules.Searches
             await ctx.Channel.TriggerTypingAsync().ConfigureAwait(false);
 
             var movie = await _service.GetMovieDataAsync(query).ConfigureAwait(false);
-            if (movie == null)
+            if (movie is null)
             {
                 await ReplyErrorLocalizedAsync("imdb_fail").ConfigureAwait(false);
                 return;
@@ -247,7 +247,7 @@ namespace NadekoBot.Modules.Searches
 
                     var img = (elems.ElementAtOrDefault(new NadekoRandom().Next(0, elems.Count))?.Children?.FirstOrDefault() as IHtmlImageElement);
 
-                    if (img?.Source == null)
+                    if (img?.Source is null)
                         return;
 
                     var source = img.Source.Replace("b.", ".", StringComparison.InvariantCulture);
@@ -406,7 +406,7 @@ namespace NadekoBot.Modules.Searches
             await ctx.Channel.TriggerTypingAsync().ConfigureAwait(false);
             var card = await _service.GetMtgCardAsync(search).ConfigureAwait(false);
 
-            if (card == null)
+            if (card is null)
             {
                 await ReplyErrorLocalizedAsync("card_not_found").ConfigureAwait(false);
                 return;
@@ -439,7 +439,7 @@ namespace NadekoBot.Modules.Searches
             await ctx.Channel.TriggerTypingAsync().ConfigureAwait(false);
             var card = await _service.GetHearthstoneCardDataAsync(name).ConfigureAwait(false);
 
-            if (card == null)
+            if (card is null)
             {
                 await ReplyErrorLocalizedAsync("card_not_found").ConfigureAwait(false);
                 return;
@@ -560,7 +560,7 @@ namespace NadekoBot.Modules.Searches
             using (var http = _httpFactory.CreateClient())
             {
                 var response = await http.GetStringAsync("https://catfact.ninja/fact").ConfigureAwait(false);
-                if (response == null)
+                if (response is null)
                     return;
 
                 var fact = JObject.Parse(response)["fact"].ToString();
@@ -573,11 +573,11 @@ namespace NadekoBot.Modules.Searches
         [RequireContext(ContextType.Guild)]
         public async Task Revav([Leftover] IGuildUser usr = null)
         {
-            if (usr == null)
+            if (usr is null)
                 usr = (IGuildUser)ctx.User;
 
             var av = usr.RealAvatarUrl();
-            if (av == null)
+            if (av is null)
                 return;
 
             await ctx.Channel.SendConfirmAsync($"https://images.google.com/searchbyimage?image_url={av}").ConfigureAwait(false);
@@ -649,12 +649,12 @@ namespace NadekoBot.Modules.Searches
         [RequireContext(ContextType.Guild)]
         public async Task Avatar([Leftover] IGuildUser usr = null)
         {
-            if (usr == null)
+            if (usr is null)
                 usr = (IGuildUser)ctx.User;
 
             var avatarUrl = usr.RealAvatarUrl(2048);
 
-            if (avatarUrl == null)
+            if (avatarUrl is null)
             {
                 await ReplyErrorLocalizedAsync("avatar_none", usr.ToString()).ConfigureAwait(false);
                 return;
@@ -725,7 +725,7 @@ namespace NadekoBot.Modules.Searches
             catch
             {
             }
-            if (obj.Error != null || obj.Verses == null || obj.Verses.Length == 0)
+            if (obj.Error != null || obj.Verses is null || obj.Verses.Length == 0)
                 await ctx.Channel.SendErrorAsync(obj.Error ?? "No verse found.").ConfigureAwait(false);
             else
             {
@@ -773,7 +773,7 @@ namespace NadekoBot.Modules.Searches
 
             var imgObj = await _service.DapiSearch(tag, type, ctx.Guild?.Id).ConfigureAwait(false);
 
-            if (imgObj == null)
+            if (imgObj is null)
                 await channel.SendErrorAsync(umsg.Author.Mention + " " + GetText("no_results")).ConfigureAwait(false);
             else
                 await channel.EmbedAsync(new EmbedBuilder().WithOkColor()

src/NadekoBot/Modules/Searches/Services/AnimeSearchService.cs

@@ -67,7 +67,7 @@ namespace NadekoBot.Modules.Searches.Services
                     using (var document = await BrowsingContext.New(config).OpenAsync(link).ConfigureAwait(false))
                     {
                         var imageElem = document.QuerySelector("div.seriesimg > img");
-                        if (imageElem == null)
+                        if (imageElem is null)
                             return null;
                         var imageUrl = ((IHtmlImageElement)imageElem).Source;
 

src/NadekoBot/Modules/Searches/Services/CryptoService.cs

@@ -40,7 +40,7 @@ namespace NadekoBot.Modules.Searches.Services
                     || x.Symbol.ToUpperInvariant() == name);
 
             (CryptoResponseData Elem, int Distance)? nearest = null;
-            if (crypto == null)
+            if (crypto is null)
             {
                 nearest = cryptos.Select(x => (x, Distance: x.Name.ToUpperInvariant().LevenshteinDistance(name)))
                     .OrderBy(x => x.Distance)

src/NadekoBot/Modules/Searches/Services/FeedsService.cs

@@ -118,7 +118,7 @@ namespace NadekoBot.Modules.Searches.Services
                                 var previewElement = afi.Element.Elements()
                                     .FirstOrDefault(x => x.Name.LocalName == "preview");
 
-                                if (previewElement == null)
+                                if (previewElement is null)
                                 {
                                     previewElement = afi.Element.Elements()
                                         .FirstOrDefault(x => x.Name.LocalName == "thumbnail");

src/NadekoBot/Modules/Searches/Services/SearchesService.cs

@@ -226,7 +226,7 @@ namespace NadekoBot.Modules.Searches.Services
                         $"appid=42cd627dd60debf25a5739e50a217d74&" +
                         $"units=metric").ConfigureAwait(false);
 
-                    if (data == null)
+                    if (data is null)
                         return null;
 
                     return JsonConvert.DeserializeObject<WeatherData>(data);
@@ -504,7 +504,7 @@ namespace NadekoBot.Modules.Searches.Services
                 search,
                 TimeSpan.FromDays(1)).ConfigureAwait(false);
 
-            if (data == null || data.Length == 0)
+            if (data is null || data.Length == 0)
                 return null;
 
             return data[_rng.Next(0, data.Length)];
@@ -543,7 +543,7 @@ namespace NadekoBot.Modules.Searches.Services
                     .ConfigureAwait(false);
 
                 var responseObject = JsonConvert.DeserializeObject<MtgResponse>(response);
-                if (responseObject == null)
+                if (responseObject is null)
                     return new MtgData[0];
 
                 var cards = responseObject.Cards.Take(5).ToArray();
@@ -582,12 +582,12 @@ namespace NadekoBot.Modules.Searches.Services
                     var response = await http.GetStringAsync($"https://omgvamp-hearthstone-v1.p.rapidapi.com/" +
                         $"cards/search/{Uri.EscapeUriString(name)}").ConfigureAwait(false);
                     var objs = JsonConvert.DeserializeObject<HearthstoneCardData[]>(response);
-                    if (objs == null || objs.Length == 0)
+                    if (objs is null || objs.Length == 0)
                         return null;
                     var data = objs.FirstOrDefault(x => x.Collectible)
                         ?? objs.FirstOrDefault(x => !string.IsNullOrEmpty(x.PlayerClass))
                         ?? objs.FirstOrDefault();
-                    if (data == null)
+                    if (data is null)
                         return null;
                     if (!string.IsNullOrWhiteSpace(data.Img))
                     {
@@ -624,7 +624,7 @@ namespace NadekoBot.Modules.Searches.Services
                 var res = await http.GetStringAsync(string.Format("https://omdbapi.nadeko.bot/?t={0}&y=&plot=full&r=json",
                     name.Trim().Replace(' ', '+'))).ConfigureAwait(false);
                 var movie = JsonConvert.DeserializeObject<OmdbMovie>(res);
-                if (movie?.Title == null)
+                if (movie?.Title is null)
                     return null;
                 movie.Poster = await _google.ShortenUrl(movie.Poster).ConfigureAwait(false);
                 return movie;
@@ -671,7 +671,7 @@ namespace NadekoBot.Modules.Searches.Services
                 }
             }, default(string), TimeSpan.FromHours(24));
 
-            if (gamesMap == null)
+            if (gamesMap is null)
                 return -1;
 
 
@@ -780,7 +780,7 @@ namespace NadekoBot.Modules.Searches.Services
                     var href = (children[0].QuerySelector("a") as IHtmlAnchorElement)?.Href;
                     var name = children[0].QuerySelector("h3")?.TextContent;
                     
-                    if (href == null || name == null)
+                    if (href is null || name is null)
                         return null;
 
                     var txt = children[1].TextContent;

src/NadekoBot/Modules/Searches/Services/YtTrackService.cs

@@ -94,7 +94,7 @@ namespace NadekoBot.Modules.Searches.Services
         //         var oldObj = gc.YtFollowedChannels
         //             .FirstOrDefault(x => x.ChannelId == channelId && x.YtChannelId == ytChannelId);
         //
-        //         if(!(oldObj is null))
+        //         if(oldObj is not null)
         //         {
         //             return false;
         //         }

src/NadekoBot/Modules/Utility/InfoCommands.cs

@@ -36,7 +36,7 @@ namespace NadekoBot.Modules.Utility
                     guild = (SocketGuild)channel.Guild;
                 else
                     guild = _client.Guilds.FirstOrDefault(g => g.Name.ToUpperInvariant() == guildName.ToUpperInvariant());
-                if (guild == null)
+                if (guild is null)
                     return;
                 var ownername = guild.GetUser(guild.OwnerId);
                 var textchn = guild.TextChannels.Count();
@@ -79,7 +79,7 @@ namespace NadekoBot.Modules.Utility
             public async Task ChannelInfo(ITextChannel channel = null)
             {
                 var ch = channel ?? (ITextChannel)ctx.Channel;
-                if (ch == null)
+                if (ch is null)
                     return;
                 var createdAt = new DateTime(2015, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(ch.Id >> 22);
                 var usercount = (await ch.GetUsersAsync().FlattenAsync().ConfigureAwait(false)).Count();
@@ -99,7 +99,7 @@ namespace NadekoBot.Modules.Utility
             {
                 var user = usr ?? ctx.User as IGuildUser;
 
-                if (user == null)
+                if (user is null)
                     return;
 
                 var embed = new EmbedBuilder()

src/NadekoBot/Modules/Utility/QuoteCommands.cs

@@ -75,7 +75,7 @@ namespace NadekoBot.Modules.Utility
                     //}
                 }
 
-                if (quote == null)
+                if (quote is null)
                     return;
 
                 var rep = new ReplacementBuilder()
@@ -141,7 +141,7 @@ namespace NadekoBot.Modules.Utility
                     keywordquote = await uow.Quotes.SearchQuoteKeywordTextAsync(ctx.Guild.Id, keyword, text);
                 }
 
-                if (keywordquote == null)
+                if (keywordquote is null)
                     return;
 
                 await ctx.Channel.SendMessageAsync($"`#{keywordquote.Id}` 💬 " + keyword.ToLowerInvariant() + ":  " +

src/NadekoBot/Modules/Utility/RemindCommands.cs

@@ -48,7 +48,7 @@ namespace NadekoBot.Modules.Utility
                 
                 ulong target;
                 target = meorhere == MeOrHere.Me ? ctx.User.Id : ctx.Channel.Id;
-                if (!await RemindInternal(target, meorhere == MeOrHere.Me || ctx.Guild == null, remindData.Time, remindData.What)
+                if (!await RemindInternal(target, meorhere == MeOrHere.Me || ctx.Guild is null, remindData.Time, remindData.What)
                     .ConfigureAwait(false))
                 {
                     await ReplyErrorLocalizedAsync("remind_too_long").ConfigureAwait(false);
@@ -144,7 +144,7 @@ namespace NadekoBot.Modules.Utility
                     }
                 }
 
-                if (rem == null)
+                if (rem is null)
                 {
                     await ReplyErrorLocalizedAsync("reminder_not_exist").ConfigureAwait(false);
                 }
@@ -186,7 +186,7 @@ namespace NadekoBot.Modules.Utility
                     await uow.SaveChangesAsync();
                 }
 
-                var gTime = ctx.Guild == null
+                var gTime = ctx.Guild is null
                     ? time
                     : TimeZoneInfo.ConvertTime(time, _tz.GetTimeZoneOrUtc(ctx.Guild.Id));
                 try

src/NadekoBot/Modules/Utility/Services/CommandMapService.cs

@@ -65,7 +65,7 @@ namespace NadekoBot.Modules.Utility.Services
         {
             await Task.Yield();
 
-            if (guild == null || string.IsNullOrWhiteSpace(input))
+            if (guild is null || string.IsNullOrWhiteSpace(input))
                 return input;
 
             if (guild != null)

src/NadekoBot/Modules/Utility/Services/PatreonRewardsService.cs

@@ -84,7 +84,7 @@ namespace NadekoBot.Modules.Utility.Services
                         data = JsonConvert.DeserializeObject<PatreonData>(res);
                         var pledgers = data.Data.Where(x => x["type"].ToString() == "pledge");
                         rewards.AddRange(pledgers.Select(x => JsonConvert.DeserializeObject<PatreonPledge>(x.ToString()))
-                            .Where(x => x.attributes.declined_since == null));
+                            .Where(x => x.attributes.declined_since is null));
                         if (data.Included != null)
                         {
                             users.AddRange(data.Included
@@ -141,7 +141,7 @@ namespace NadekoBot.Modules.Utility.Services
                         var users = uow.Set<RewardedUser>();
                         var usr = users.FirstOrDefault(x => x.PatreonUserId == data.User.id);
 
-                        if (usr == null)
+                        if (usr is null)
                         {
                             users.Add(new RewardedUser()
                             {