Using pattern matching for nulls where applicable, discarded unused lambda parameters, cleaned up some classes. Unignored ServerLog commands which was mistakenly ignored due to a .gitignore rule

src/NadekoBot/Bot.cs

@@ -315,7 +315,7 @@ public sealed class Bot
 
     private Task Client_Log(LogMessage arg)
     {
-        if (arg.Exception != null)
+        if (arg.Exception is not null)
             Log.Warning(arg.Exception, "{ErrorSource} | {ErrorMessage}", arg.Source, arg.Message);
         else
             Log.Warning("{ErrorSource} | {ErrorMessage}", arg.Source, arg.Message);

src/NadekoBot/Common/Collections/ConcurrentHashSet.cs

@@ -342,7 +342,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
         // The Volatile.Read ensures that the load of the fields of 'n' doesn't move before the load from buckets[i].
         var current = Volatile.Read(ref tables.Buckets[bucketNo]);
 
-        while (current != null)
+        while (current is not null)
         {
             if (hashcode == current.Hashcode && _comparer.Equals(current.Item, item))
                 return true;
@@ -410,7 +410,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
             // The Volatile.Read ensures that the load of the fields of 'current' doesn't move before the load from buckets[i].
             var current = Volatile.Read(ref buckets[i]);
 
-            while (current != null)
+            while (current is not null)
             {
                 yield return current.Item;
                 current = current.Next;
@@ -454,7 +454,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
                 if (tables != _tables) continue;
 
                 Node previous = null;
-                for (var current = tables.Buckets[bucketNo]; current != null; current = current.Next)
+                for (var current = tables.Buckets[bucketNo]; current is not null; current = current.Next)
                 {
                     Debug.Assert((previous is null && current == tables.Buckets[bucketNo]) || previous.Next == current);
 
@@ -504,7 +504,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
 
                 // Try to find this item in the bucket
                 Node previous = null;
-                for (var current = tables.Buckets[bucketNo]; current != null; current = current.Next)
+                for (var current = tables.Buckets[bucketNo]; current is not null; current = current.Next)
                 {
                     Debug.Assert((previous is null && current == tables.Buckets[bucketNo]) || previous.Next == current);
                     if (hashcode == current.Hashcode && _comparer.Equals(current.Item, item))
@@ -656,7 +656,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
             for (var i = 0; i < tables.Buckets.Length; i++)
             {
                 var current = tables.Buckets[i];
-                while (current != null)
+                while (current is not null)
                 {
                     var next = current.Next;
                     GetBucketAndLockNo(current.Hashcode,
@@ -741,7 +741,7 @@ public sealed class ConcurrentHashSet<T> : IReadOnlyCollection<T>, ICollection<T
     {
         var buckets = _tables.Buckets;
         for (var i = 0; i < buckets.Length; i++)
-        for (var current = buckets[i]; current != null; current = current.Next)
+        for (var current = buckets[i]; current is not null; current = current.Next)
         {
             array[index] = current.Item;
             index++; //this should never flow, CopyToItems is only called when there's no overflow risk

src/NadekoBot/Common/OptionsParser.cs

@@ -17,7 +17,7 @@ public static class OptionsParser
             x.HelpWriter = null;
         });
         var res = p.ParseArguments<T>(args);
-        options = res.MapResult(x => x, x => options);
+        options = res.MapResult(x => x, _ => options);
         options.NormalizeOptions();
         return (options, res.Tag == ParserResultType.Parsed);
     }

src/NadekoBot/Common/Replacements/ReplacementBuilder.cs

@@ -62,7 +62,7 @@ public class ReplacementBuilder
             () =>
             {
                 var to = TimeZoneInfo.Local;
-                if (g != null)
+                if (g is not null)
                     if (GuildTimezoneService.AllServices.TryGetValue(client.CurrentUser.Id, out var tz))
                         to = tz.GetTimeZoneOrDefault(g.Id) ?? TimeZoneInfo.Local;
 

src/NadekoBot/Common/Replacements/Replacer.cs

@@ -50,13 +50,13 @@ public class Replacer
             Image = Replace(embedData.Image),
             Url = Replace(embedData.Url)
         };
-        if (embedData.Author != null)
+        if (embedData.Author is not null)
             newEmbedData.Author = new()
             {
                 Name = Replace(embedData.Author.Name), IconUrl = Replace(embedData.Author.IconUrl)
             };
 
-        if (embedData.Fields != null)
+        if (embedData.Fields is not null)
         {
             var fields = new List<SmartTextEmbedField>();
             foreach (var f in embedData.Fields)
@@ -71,7 +71,7 @@ public class Replacer
             newEmbedData.Fields = fields.ToArray();
         }
 
-        if (embedData.Footer != null)
+        if (embedData.Footer is not null)
             newEmbedData.Footer = new()
             {
                 Text = Replace(embedData.Footer.Text), IconUrl = Replace(embedData.Footer.IconUrl)

src/NadekoBot/Common/SmartText/SmartEmbedText.cs

@@ -22,7 +22,7 @@ public sealed record SmartEmbedText : SmartText
            || !string.IsNullOrWhiteSpace(Url)
            || !string.IsNullOrWhiteSpace(Thumbnail)
            || !string.IsNullOrWhiteSpace(Image)
-           || (Footer != null
+           || (Footer is not null
                && (!string.IsNullOrWhiteSpace(Footer.Text) || !string.IsNullOrWhiteSpace(Footer.IconUrl)))
            || Fields is { Length: > 0 };
 
@@ -62,10 +62,10 @@ public sealed record SmartEmbedText : SmartText
         if (!string.IsNullOrWhiteSpace(Description))
             embed.WithDescription(Description);
 
-        if (Url != null && Uri.IsWellFormedUriString(Url, UriKind.Absolute))
+        if (Url is not null && Uri.IsWellFormedUriString(Url, UriKind.Absolute))
             embed.WithUrl(Url);
 
-        if (Footer != null)
+        if (Footer is not null)
             embed.WithFooter(efb =>
             {
                 efb.WithText(Footer.Text);
@@ -73,13 +73,13 @@ public sealed record SmartEmbedText : SmartText
                     efb.WithIconUrl(Footer.IconUrl);
             });
 
-        if (Thumbnail != null && Uri.IsWellFormedUriString(Thumbnail, UriKind.Absolute))
+        if (Thumbnail is not null && Uri.IsWellFormedUriString(Thumbnail, UriKind.Absolute))
             embed.WithThumbnailUrl(Thumbnail);
 
-        if (Image != null && Uri.IsWellFormedUriString(Image, UriKind.Absolute))
+        if (Image is not null && Uri.IsWellFormedUriString(Image, UriKind.Absolute))
             embed.WithImageUrl(Image);
 
-        if (Author != null && !string.IsNullOrWhiteSpace(Author.Name))
+        if (Author is not null && !string.IsNullOrWhiteSpace(Author.Name))
         {
             if (!Uri.IsWellFormedUriString(Author.IconUrl, UriKind.Absolute))
                 Author.IconUrl = null;
@@ -89,7 +89,7 @@ public sealed record SmartEmbedText : SmartText
             embed.WithAuthor(Author.Name, Author.IconUrl, Author.Url);
         }
 
-        if (Fields != null)
+        if (Fields is not null)
             foreach (var f in Fields)
                 if (!string.IsNullOrWhiteSpace(f.Name) && !string.IsNullOrWhiteSpace(f.Value))
                     embed.AddField(f.Name, f.Value, f.Inline);

src/NadekoBot/Common/TypeReaders/GuildTypeReader.cs

@@ -16,7 +16,7 @@ public sealed class GuildTypeReader : NadekoTypeReader<IGuild>
                     ?? //by id
                     guilds.FirstOrDefault(g => g.Name.Trim().ToUpperInvariant() == input); //by name
 
-        if (guild != null)
+        if (guild is not null)
             return Task.FromResult(TypeReaderResult.FromSuccess(guild));
 
         return Task.FromResult(

src/NadekoBot/Common/Yml/CommentGatheringTypeInspector.cs

@@ -57,7 +57,7 @@ public class CommentGatheringTypeInspector : TypeInspectorSkeleton
         public IObjectDescriptor Read(object target)
         {
             var comment = baseDescriptor.GetCustomAttribute<CommentAttribute>();
-            return comment != null
+            return comment is not null
                 ? new CommentsObjectDescriptor(baseDescriptor.Read(target), comment.Comment)
                 : baseDescriptor.Read(target);
         }

src/NadekoBot/Db/Extensions/PollExtensions.cs

@@ -17,13 +17,13 @@ public static class PollExtensions
         if (p is null)
             return;
 
-        if (p.Votes != null)
+        if (p.Votes is not null)
         {
             ctx.RemoveRange(p.Votes);
             p.Votes.Clear();
         }
 
-        if (p.Answers != null)
+        if (p.Answers is not null)
         {
             ctx.RemoveRange(p.Answers);
             p.Answers.Clear();

src/NadekoBot/Db/Extensions/QuoteExtensions.cs

@@ -31,7 +31,7 @@ public static class QuoteExtensions
     {
         var rng = new NadekoRandom();
         return (await quotes.AsQueryable().Where(q => q.GuildId == guildId && q.Keyword == keyword).ToListAsync())
-               .OrderBy(q => rng.Next())
+               .OrderBy(_ => rng.Next())
                .FirstOrDefault();
     }
 
@@ -48,7 +48,7 @@ public static class QuoteExtensions
                                         && EF.Functions.Like(q.Text.ToUpper(), $"%{text.ToUpper()}%")
                                 // && q.Text.Contains(text, StringComparison.OrdinalIgnoreCase)
                             )
-                            .ToListAsync()).OrderBy(q => rngk.Next())
+                            .ToListAsync()).OrderBy(_ => rngk.Next())
                                            .FirstOrDefault();
     }
 

src/NadekoBot/Db/Models/Waifu.cs

@@ -25,7 +25,7 @@ public class WaifuInfo : DbEntity
         var waifuUsername = Waifu.Username.TrimTo(20);
         var claimerUsername = Claimer?.Username.TrimTo(20);
 
-        if (ClaimerId != null) claimer = $"{claimerUsername}#{Claimer.Discriminator}";
+        if (ClaimerId is not null) claimer = $"{claimerUsername}#{Claimer.Discriminator}";
         if (AffinityId is null)
             status = $"... but {waifuUsername}'s heart is empty";
         else if (AffinityId == ClaimerId)
@@ -58,7 +58,7 @@ public class WaifuLbResult
         var waifuUsername = Username.TrimTo(20);
         var claimerUsername = Claimer?.TrimTo(20);
 
-        if (Claimer != null) claimer = $"{claimerUsername}#{ClaimerDiscrim}";
+        if (Claimer is not null) claimer = $"{claimerUsername}#{ClaimerDiscrim}";
         if (Affinity is null)
             status = $"... but {waifuUsername}'s heart is empty";
         else if (Affinity + AffinityDiscrim == Claimer + ClaimerDiscrim)

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

@@ -16,7 +16,7 @@ public class GameVoiceChannelService : INService
         _db = db;
         _client = client;
 
-        GameVoiceChannels = new(bot.AllGuildConfigs.Where(gc => gc.GameVoiceChannel != null)
+        GameVoiceChannels = new(bot.AllGuildConfigs.Where(gc => gc.GameVoiceChannel is not null)
                                    .Select(gc => gc.GameVoiceChannel.Value));
 
         _client.UserVoiceStateUpdated += Client_UserVoiceStateUpdated;
@@ -62,7 +62,7 @@ public class GameVoiceChannelService : INService
         }
         else
         {
-            if (gc.GameVoiceChannel != null)
+            if (gc.GameVoiceChannel is not null)
                 GameVoiceChannels.TryRemove(gc.GameVoiceChannel.Value);
             GameVoiceChannels.Add(vchId);
             id = gc.GameVoiceChannel = vchId;

src/NadekoBot/Modules/Administration/GreetBye/GreetService.cs

@@ -240,7 +240,7 @@ public class GreetService : INService
                 if (conf.SendChannelGreetMessage)
                 {
                     var channel = await user.Guild.GetTextChannelAsync(conf.GreetMessageChannelId);
-                    if (channel != null)
+                    if (channel is not null)
                     {
                         if (GroupGreets)
                         {

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

@@ -176,7 +176,7 @@ public class MuteService : INService
         await using var uow = _db.GetDbContext();
         var config = uow.GuildConfigsForId(guildId, set => set);
         config.MuteRoleName = name;
-        GuildMuteRoles.AddOrUpdate(guildId, name, (id, old) => name);
+        GuildMuteRoles.AddOrUpdate(guildId, name, (_, _) => name);
         await uow.SaveChangesAsync();
     }
 
@@ -243,7 +243,7 @@ public class MuteService : INService
                     set => set.Include(gc => gc.MutedUsers).Include(gc => gc.UnmuteTimers));
                 var match = new MutedUserId { UserId = usrId };
                 var toRemove = config.MutedUsers.FirstOrDefault(x => x.Equals(match));
-                if (toRemove != null) uow.Remove(toRemove);
+                if (toRemove is not null) uow.Remove(toRemove);
                 if (MutedUsers.TryGetValue(guildId, out var muted))
                     muted.TryRemove(usrId);
 
@@ -252,7 +252,7 @@ public class MuteService : INService
                 await uow.SaveChangesAsync();
             }
 
-            if (usr != null)
+            if (usr is not null)
             {
                 try { await usr.ModifyAsync(x => x.Mute = false); }
                 catch { }
@@ -405,7 +405,7 @@ public class MuteService : INService
                         RemoveTimerFromDb(guildId, userId, type);
                         StopTimer(guildId, userId, type);
                         var guild = _client.GetGuild(guildId); // load the guild
-                        if (guild != null) await guild.RemoveBanAsync(userId);
+                        if (guild is not null) await guild.RemoveBanAsync(userId);
                     }
                     catch (Exception ex)
                     {
@@ -419,7 +419,7 @@ public class MuteService : INService
                         var guild = _client.GetGuild(guildId);
                         var user = guild?.GetUser(userId);
                         var role = guild.GetRole(roleId.Value);
-                        if (guild != null && user != null && user.Roles.Contains(role))
+                        if (guild is not null && user is not null && user.Roles.Contains(role))
                             await user.RemoveRoleAsync(role);
                     }
                     catch (Exception ex)
@@ -444,8 +444,8 @@ public class MuteService : INService
 
         //add it, or stop the old one and add this one
         userUnTimers.AddOrUpdate((userId, type),
-            key => toAdd,
-            (key, old) =>
+            _ => toAdd,
+            (_, old) =>
             {
                 old.Change(Timeout.Infinite, Timeout.Infinite);
                 return toAdd;
@@ -475,7 +475,7 @@ public class MuteService : INService
             toDelete = config.UnbanTimer.FirstOrDefault(x => x.UserId == userId);
         }
 
-        if (toDelete != null) uow.Remove(toDelete);
+        if (toDelete is not null) uow.Remove(toDelete);
         uow.SaveChanges();
     }
 }

src/NadekoBot/Modules/Administration/Protection/ProtectionCommands.cs

@@ -219,10 +219,10 @@ public partial class Administration
 
             var embed = _eb.Create().WithOkColor().WithTitle(GetText(strs.prot_active));
 
-            if (spam != null)
+            if (spam is not null)
                 embed.AddField("Anti-Spam", GetAntiSpamString(spam).TrimTo(1024), true);
 
-            if (raid != null)
+            if (raid is not null)
                 embed.AddField("Anti-Raid", GetAntiRaidString(raid).TrimTo(1024), true);
 
             if (alt is not null)

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

@@ -122,13 +122,13 @@ public class ProtectionService : INService
         var raid = gc.AntiRaidSetting;
         var spam = gc.AntiSpamSetting;
 
-        if (raid != null)
+        if (raid is not null)
         {
             var raidStats = new AntiRaidStats { AntiRaidSettings = raid };
             _antiRaidGuilds[gc.GuildId] = raidStats;
         }
 
-        if (spam != null)
+        if (spam is not null)
             _antiSpamGuilds[gc.GuildId] = new() { AntiSpamSettings = spam };
 
         var alt = gc.AntiAltSetting;
@@ -212,8 +212,8 @@ public class ProtectionService : INService
                     return;
 
                 var stats = spamSettings.UserStats.AddOrUpdate(msg.Author.Id,
-                    id => new(msg),
-                    (id, old) =>
+                    _ => new(msg),
+                    (_, old) =>
                     {
                         old.ApplyNextMessage(msg);
                         return old;
@@ -292,7 +292,7 @@ public class ProtectionService : INService
             }
         };
 
-        _antiRaidGuilds.AddOrUpdate(guildId, stats, (key, old) => stats);
+        _antiRaidGuilds.AddOrUpdate(guildId, stats, (_, _) => stats);
 
         await using var uow = _db.GetDbContext();
         var gc = uow.GuildConfigsForId(guildId, set => set.Include(x => x.AntiRaidSetting));
@@ -362,7 +362,7 @@ public class ProtectionService : INService
 
         stats = _antiSpamGuilds.AddOrUpdate(guildId,
             stats,
-            (key, old) =>
+            (_, old) =>
             {
                 stats.AntiSpamSettings.IgnoredChannels = old.AntiSpamSettings.IgnoredChannels;
                 return stats;
@@ -371,7 +371,7 @@ public class ProtectionService : INService
         await using var uow = _db.GetDbContext();
         var gc = uow.GuildConfigsForId(guildId, set => set.Include(x => x.AntiSpamSetting));
 
-        if (gc.AntiSpamSetting != null)
+        if (gc.AntiSpamSetting is not null)
         {
             gc.AntiSpamSetting.Action = stats.AntiSpamSettings.Action;
             gc.AntiSpamSetting.MessageThreshold = stats.AntiSpamSettings.MessageThreshold;

src/NadekoBot/Modules/Administration/Prune/PruneCommands.cs

@@ -41,7 +41,7 @@ public partial class Administration
             if (parameter is "-s" or "--safe")
                 await _service.PruneWhere((ITextChannel)ctx.Channel, count, x => !x.IsPinned);
             else
-                await _service.PruneWhere((ITextChannel)ctx.Channel, count, x => true);
+                await _service.PruneWhere((ITextChannel)ctx.Channel, count, _ => true);
         }
 
         //prune @user [x]

src/NadekoBot/Modules/Administration/Role/RoleCommands.cs

@@ -46,7 +46,7 @@ public partial class Administration
                                      var emote = x.Last().ToIEmote();
                                      return new { role, emote };
                                  })
-                                 .Where(x => x != null)
+                                 .Where(x => x is not null)
                                  .WhenAll();
 
             if (!all.Any())

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

@@ -54,7 +54,7 @@ public class RoleCommandsService : INService
             var reactionRole = conf.ReactionRoles.FirstOrDefault(x
                 => x.EmoteName == reaction.Emote.Name || x.EmoteName == reaction.Emote.ToString());
 
-            if (reactionRole != null)
+            if (reactionRole is not null)
             {
                 if (!conf.Exclusive)
                 {
@@ -125,7 +125,7 @@ public class RoleCommandsService : INService
                 var reactionRole = conf.ReactionRoles.FirstOrDefault(x
                     => x.EmoteName == reaction.Emote.Name || x.EmoteName == reaction.Emote.ToString());
 
-                if (reactionRole != null)
+                if (reactionRole is not null)
                 {
                     var role = gusr.Guild.GetRole(reactionRole.RoleId);
                     if (role is null)
@@ -181,7 +181,7 @@ public class RoleCommandsService : INService
     {
         var toAdd = user.Guild.GetRole(dbRero.RoleId);
 
-        return toAdd != null && !user.Roles.Contains(toAdd) ? user.AddRoleAsync(toAdd) : Task.CompletedTask;
+        return toAdd is not null && !user.Roles.Contains(toAdd) ? user.AddRoleAsync(toAdd) : Task.CompletedTask;
     }
 
     /// <summary>
@@ -208,7 +208,7 @@ public class RoleCommandsService : INService
         var roleIds = dbReroMsg.ReactionRoles.Select(x => x.RoleId)
                                .Where(x => x != dbRero.RoleId)
                                .Select(x => user.Guild.GetRole(x))
-                               .Where(x => x != null);
+                               .Where(x => x is not null);
 
         var removeReactionsTask = RemoveOldReactionsAsync(reactionMessage, user, reaction, cToken);
 

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

@@ -147,8 +147,8 @@ public sealed class SelfService : ILateExecutor, IReadyExecutor, INService
         {
             var autos = _autoCommands.GetOrAdd(cmd.GuildId, new ConcurrentDictionary<int, Timer>());
             autos.AddOrUpdate(cmd.Id,
-                key => TimerFromAutoCommand(cmd),
-                (key, old) =>
+                _ => TimerFromAutoCommand(cmd),
+                (_, old) =>
                 {
                     old.Change(Timeout.Infinite, Timeout.Infinite);
                     return TimerFromAutoCommand(cmd);
@@ -179,7 +179,7 @@ public sealed class SelfService : ILateExecutor, IReadyExecutor, INService
             return user.CreateDMChannelAsync();
         }));
 
-        ownerChannels = channels.Where(x => x != null)
+        ownerChannels = channels.Where(x => x is not null)
                                 .ToDictionary(x => x.Recipient.Id, x => x)
                                 .ToImmutableDictionary();
 
@@ -244,7 +244,7 @@ public sealed class SelfService : ILateExecutor, IReadyExecutor, INService
         using var uow = _db.GetDbContext();
         cmd = uow.AutoCommands.AsNoTracking().Where(x => x.Interval == 0).Skip(index).FirstOrDefault();
 
-        if (cmd != null)
+        if (cmd is not null)
         {
             uow.Remove(cmd);
             uow.SaveChanges();
@@ -259,7 +259,7 @@ public sealed class SelfService : ILateExecutor, IReadyExecutor, INService
         using var uow = _db.GetDbContext();
         cmd = uow.AutoCommands.AsNoTracking().Where(x => x.Interval >= 5).Skip(index).FirstOrDefault();
 
-        if (cmd != null)
+        if (cmd is not null)
         {
             uow.Remove(cmd);
             if (_autoCommands.TryGetValue(cmd.GuildId, out var autos))

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

@@ -77,7 +77,7 @@ public class SelfAssignedRolesService : INService
             foreach (var roleId in sameRoles)
             {
                 var sameRole = guildUser.Guild.GetRole(roleId);
-                if (sameRole != null)
+                if (sameRole is not null)
                     try
                     {
                         await guildUser.RemoveRoleAsync(sameRole);
@@ -111,7 +111,7 @@ public class SelfAssignedRolesService : INService
 
         if (string.IsNullOrWhiteSpace(name))
         {
-            if (toUpdate != null)
+            if (toUpdate is not null)
                 gc.SelfAssignableRoleGroupNames.Remove(toUpdate);
         }
         else if (toUpdate is null)
@@ -174,7 +174,7 @@ public class SelfAssignedRolesService : INService
         using var uow = _db.GetDbContext();
         var roles = uow.SelfAssignableRoles.GetFromGuild(guildId);
         var sar = roles.FirstOrDefault(x => x.RoleId == role.Id);
-        if (sar != null)
+        if (sar is not null)
         {
             sar.LevelRequirement = level;
             uow.SaveChanges();
@@ -216,6 +216,6 @@ public class SelfAssignedRolesService : INService
             uow.SaveChanges();
         }
 
-        return (exclusive, roles.Where(x => x.Role != null), groupNames);
+        return (exclusive, roles.Where(x => x.Role is not null), groupNames);
     }
 }

src/NadekoBot/Modules/Administration/ServerLog/DummyLogCommandService.cs

@@ -0,0 +1,22 @@
+using NadekoBot.Services.Database.Models;
+
+namespace NadekoBot.Modules.Administration;
+
+public sealed class DummyLogCommandService : ILogCommandService
+{
+    public void AddDeleteIgnore(ulong xId)
+    {
+    }
+
+    public Task LogServer(ulong guildId, ulong channelId, bool actionValue)
+        => Task.CompletedTask;
+
+    public bool LogIgnore(ulong guildId, ulong itemId, IgnoredItemType itemType)
+        => false;
+
+    public LogSetting? GetGuildLogSettings(ulong guildId)
+        => default;
+
+    public bool Log(ulong guildId, ulong? channelId, LogType type)
+        => false;
+}

src/NadekoBot/Modules/Administration/ServerLog/ServerLogCommands.cs

@@ -0,0 +1,157 @@
+using NadekoBot.Common.TypeReaders.Models;
+using NadekoBot.Services.Database.Models;
+
+namespace NadekoBot.Modules.Administration;
+
+public partial class Administration
+{
+    [Group]
+    [NoPublicBot]
+    public partial class LogCommands : NadekoSubmodule<ILogCommandService>
+    {
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task LogServer(PermissionAction action)
+        {
+            await _service.LogServer(ctx.Guild.Id, ctx.Channel.Id, action.Value);
+            if (action.Value)
+                await ReplyConfirmLocalizedAsync(strs.log_all);
+            else
+                await ReplyConfirmLocalizedAsync(strs.log_disabled);
+        }
+
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task LogIgnore()
+        {
+            var settings = _service.GetGuildLogSettings(ctx.Guild.Id);
+
+            var chs = settings?.LogIgnores.Where(x => x.ItemType == IgnoredItemType.Channel).ToList()
+                      ?? new List<IgnoredLogItem>();
+            var usrs = settings?.LogIgnores.Where(x => x.ItemType == IgnoredItemType.User).ToList()
+                       ?? new List<IgnoredLogItem>();
+
+            var eb = _eb.Create(ctx)
+                        .WithOkColor()
+                        .AddField(GetText(strs.log_ignored_channels),
+                            chs.Count == 0
+                                ? "-"
+                                : string.Join('\n', chs.Select(x => $"{x.LogItemId} | <#{x.LogItemId}>")))
+                        .AddField(GetText(strs.log_ignored_users),
+                            usrs.Count == 0
+                                ? "-"
+                                : string.Join('\n', usrs.Select(x => $"{x.LogItemId} | <@{x.LogItemId}>")));
+
+            await ctx.Channel.EmbedAsync(eb);
+        }
+
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task LogIgnore([Leftover] ITextChannel target)
+        {
+            var removed = _service.LogIgnore(ctx.Guild.Id, target.Id, IgnoredItemType.Channel);
+
+            if (!removed)
+                await ReplyConfirmLocalizedAsync(
+                    strs.log_ignore_chan(Format.Bold(target.Mention + "(" + target.Id + ")")));
+            else
+                await ReplyConfirmLocalizedAsync(
+                    strs.log_not_ignore_chan(Format.Bold(target.Mention + "(" + target.Id + ")")));
+        }
+
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task LogIgnore([Leftover] IUser target)
+        {
+            var removed = _service.LogIgnore(ctx.Guild.Id, target.Id, IgnoredItemType.User);
+
+            if (!removed)
+                await ReplyConfirmLocalizedAsync(
+                    strs.log_ignore_user(Format.Bold(target.Mention + "(" + target.Id + ")")));
+            else
+                await ReplyConfirmLocalizedAsync(
+                    strs.log_not_ignore_user(Format.Bold(target.Mention + "(" + target.Id + ")")));
+        }
+
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task LogEvents()
+        {
+            var logSetting = _service.GetGuildLogSettings(ctx.Guild.Id);
+            var str = string.Join("\n",
+                Enum.GetNames(typeof(LogType))
+                    .Select(x =>
+                    {
+                        var val = logSetting is null ? null : GetLogProperty(logSetting, Enum.Parse<LogType>(x));
+                        if (val is not null)
+                            return $"{Format.Bold(x)} <#{val}>";
+                        return Format.Bold(x);
+                    }));
+
+            await SendConfirmAsync(Format.Bold(GetText(strs.log_events)) + "\n" + str);
+        }
+
+        private static ulong? GetLogProperty(LogSetting l, LogType type)
+        {
+            switch (type)
+            {
+                case LogType.Other:
+                    return l.LogOtherId;
+                case LogType.MessageUpdated:
+                    return l.MessageUpdatedId;
+                case LogType.MessageDeleted:
+                    return l.MessageDeletedId;
+                case LogType.UserJoined:
+                    return l.UserJoinedId;
+                case LogType.UserLeft:
+                    return l.UserLeftId;
+                case LogType.UserBanned:
+                    return l.UserBannedId;
+                case LogType.UserUnbanned:
+                    return l.UserUnbannedId;
+                case LogType.UserUpdated:
+                    return l.UserUpdatedId;
+                case LogType.ChannelCreated:
+                    return l.ChannelCreatedId;
+                case LogType.ChannelDestroyed:
+                    return l.ChannelDestroyedId;
+                case LogType.ChannelUpdated:
+                    return l.ChannelUpdatedId;
+                case LogType.UserPresence:
+                    return l.LogUserPresenceId;
+                case LogType.VoicePresence:
+                    return l.LogVoicePresenceId;
+                case LogType.VoicePresenceTTS:
+                    return l.LogVoicePresenceTTSId;
+                case LogType.UserMuted:
+                    return l.UserMutedId;
+                default:
+                    return null;
+            }
+        }
+
+        [Cmd]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [OwnerOnly]
+        public async partial Task Log(LogType type)
+        {
+            var val = _service.Log(ctx.Guild.Id, ctx.Channel.Id, type);
+
+            if (val)
+                await ReplyConfirmLocalizedAsync(strs.log(Format.Bold(type.ToString())));
+            else
+                await ReplyConfirmLocalizedAsync(strs.log_stop(Format.Bold(type.ToString())));
+        }
+    }
+}

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

@@ -13,12 +13,12 @@ public class GuildTimezoneService : INService
     public GuildTimezoneService(DiscordSocketClient client, Bot bot, DbService db)
     {
         _timezones = bot.AllGuildConfigs.Select(GetTimzezoneTuple)
-                        .Where(x => x.Timezone != null)
+                        .Where(x => x.Timezone is not null)
                         .ToDictionary(x => x.GuildId, x => x.Timezone)
                         .ToConcurrent();
 
         var curUser = client.CurrentUser;
-        if (curUser != null)
+        if (curUser is not null)
             AllServices.TryAdd(curUser.Id, this);
         _db = db;
 
@@ -28,7 +28,7 @@ public class GuildTimezoneService : INService
     private Task Bot_JoinedGuild(GuildConfig arg)
     {
         var (guildId, tz) = GetTimzezoneTuple(arg);
-        if (tz != null)
+        if (tz is not null)
             _timezones.TryAdd(guildId, tz);
         return Task.CompletedTask;
     }
@@ -69,7 +69,7 @@ public class GuildTimezoneService : INService
         if (tz is null)
             _timezones.TryRemove(guildId, out tz);
         else
-            _timezones.AddOrUpdate(guildId, tz, (key, old) => tz);
+            _timezones.AddOrUpdate(guildId, tz, (_, _) => tz);
     }
 
     public TimeZoneInfo GetTimeZoneOrUtc(ulong guildId)

src/NadekoBot/Modules/Administration/UserPunish/UserPunishCommands.cs

@@ -392,12 +392,12 @@ public partial class Administration
 
             var guildUser = await ((DiscordSocketClient)Context.Client).Rest.GetGuildUserAsync(ctx.Guild.Id, user.Id);
 
-            if (guildUser != null && !await CheckRoleHierarchy(guildUser))
+            if (guildUser is not null && !await CheckRoleHierarchy(guildUser))
                 return;
 
             var dmFailed = false;
 
-            if (guildUser != null)
+            if (guildUser is not null)
                 try
                 {
                     var defaultMessage = GetText(strs.bandm(Format.Bold(ctx.Guild.Name), msg));

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

@@ -80,7 +80,7 @@ public class UserPunishService : INService
 
         var p = ps.FirstOrDefault(x => x.Count == warnings);
 
-        if (p != null)
+        if (p is not null)
         {
             var user = await guild.GetUserAsync(userId);
             if (user is null)
@@ -305,9 +305,9 @@ WHERE GuildId={guildId}
         IRole role = null)
     {
         // these 3 don't make sense with time
-        if (punish is PunishmentAction.Softban or PunishmentAction.Kick or PunishmentAction.RemoveRoles && time != null)
+        if (punish is PunishmentAction.Softban or PunishmentAction.Kick or PunishmentAction.RemoveRoles && time is not null)
             return false;
-        if (number <= 0 || (time != null && time.Time > TimeSpan.FromDays(49)))
+        if (number <= 0 || (time is not null && time.Time > TimeSpan.FromDays(49)))
             return false;
 
         using var uow = _db.GetDbContext();
@@ -336,7 +336,7 @@ WHERE GuildId={guildId}
         var ps = uow.GuildConfigsForId(guildId, set => set.Include(x => x.WarnPunishments)).WarnPunishments;
         var p = ps.FirstOrDefault(x => x.Count == number);
 
-        if (p != null)
+        if (p is not null)
         {
             uow.Remove(p);
             uow.SaveChanges();

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

@@ -137,7 +137,7 @@ public class VcRoleService : INService
         using var uow = _db.GetDbContext();
         var conf = uow.GuildConfigsForId(guildId, set => set.Include(x => x.VcRoleInfos));
         var toDelete = conf.VcRoleInfos.FirstOrDefault(x => x.VoiceChannelId == vcId); // remove old one
-        if (toDelete != null) uow.Remove(toDelete);
+        if (toDelete is not null) uow.Remove(toDelete);
         conf.VcRoleInfos.Add(new() { VoiceChannelId = vcId, RoleId = role.Id }); // add new one
         uow.SaveChanges();
     }
@@ -178,10 +178,10 @@ public class VcRoleService : INService
                     if (VcRoles.TryGetValue(guildId, out var guildVcRoles))
                     {
                         //remove old
-                        if (oldVc != null && guildVcRoles.TryGetValue(oldVc.Id, out var role))
+                        if (oldVc is not null && guildVcRoles.TryGetValue(oldVc.Id, out var role))
                             Assign(false, gusr, role);
                         //add new
-                        if (newVc != null && guildVcRoles.TryGetValue(newVc.Id, out role)) Assign(true, gusr, role);
+                        if (newVc is not null && guildVcRoles.TryGetValue(newVc.Id, out role)) Assign(true, gusr, role);
                     }
                 }
             }

src/NadekoBot/Modules/CustomReactions/CustomReactions.cs

@@ -21,7 +21,7 @@ public partial class CustomReactions : NadekoModule<CustomReactionsService>
 
     private bool AdminInGuildOrOwnerInDm()
         => (ctx.Guild is null && _creds.IsOwner(ctx.User))
-           || (ctx.Guild != null && ((IGuildUser)ctx.User).GuildPermissions.Administrator);
+           || (ctx.Guild is not null && ((IGuildUser)ctx.User).GuildPermissions.Administrator);
 
     [Cmd]
     public async partial Task AddCustReact(string key, [Leftover] string message)
@@ -55,14 +55,14 @@ public partial class CustomReactions : NadekoModule<CustomReactionsService>
             return;
 
         if ((channel is null && !_creds.IsOwner(ctx.User))
-            || (channel != null && !((IGuildUser)ctx.User).GuildPermissions.Administrator))
+            || (channel is not null && !((IGuildUser)ctx.User).GuildPermissions.Administrator))
         {
             await ReplyErrorLocalizedAsync(strs.insuff_perms);
             return;
         }
 
         var cr = await _service.EditAsync(ctx.Guild?.Id, id, message);
-        if (cr != null)
+        if (cr is not null)
             await ctx.Channel.EmbedAsync(_eb.Create()
                                             .WithOkColor()
                                             .WithTitle(GetText(strs.edited_cust_react))
@@ -140,7 +140,7 @@ public partial class CustomReactions : NadekoModule<CustomReactionsService>
 
         var cr = await _service.DeleteAsync(ctx.Guild?.Id, id);
 
-        if (cr != null)
+        if (cr is not null)
             await ctx.Channel.EmbedAsync(_eb.Create()
                                             .WithOkColor()
                                             .WithTitle(GetText(strs.deleted))

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

@@ -351,7 +351,7 @@ public sealed class CustomReactionsService : IEarlyBehavior, IReadyExecutor
         if (maybeGuildId is { } guildId)
             _newGuildReactions.AddOrUpdate(guildId,
                 new[] { cr },
-                (key, old) =>
+                (_, old) =>
                 {
                     var newArray = old.ToArray();
                     for (var i = 0; i < newArray.Length; i++)
@@ -375,7 +375,7 @@ public sealed class CustomReactionsService : IEarlyBehavior, IReadyExecutor
         cr.Trigger = cr.Trigger.Replace(MentionPh, _client.CurrentUser.Mention);
 
         if (maybeGuildId is { } guildId)
-            _newGuildReactions.AddOrUpdate(guildId, new[] { cr }, (key, old) => old.With(cr));
+            _newGuildReactions.AddOrUpdate(guildId, new[] { cr }, (_, old) => old.With(cr));
         else
             return _pubSub.Pub(_gcrAddedKey, cr);
 
@@ -492,7 +492,7 @@ public sealed class CustomReactionsService : IEarlyBehavior, IReadyExecutor
     {
         using var uow = _db.GetDbContext();
         var cr = uow.CustomReactions.GetByGuildIdAndInput(guildId, input);
-        return cr != null;
+        return cr is not null;
     }
 
     public string ExportCrs(ulong? guildId)

src/NadekoBot/Modules/Gambling/BlackJackCommands.cs

@@ -73,7 +73,7 @@ public partial class Gambling
         {
             try
             {
-                if (_msg != null)
+                if (_msg is not null)
                 {
                     var _ = _msg.DeleteAsync();
                 }
@@ -97,7 +97,7 @@ public partial class Gambling
                                .WithTitle("BlackJack")
                                .AddField($"{dealerIcon} Dealer's Hand | Value: {bj.Dealer.GetHandValue()}", cStr);
 
-                if (bj.CurrentUser != null) embed.WithFooter($"Player to make a choice: {bj.CurrentUser.DiscordUser}");
+                if (bj.CurrentUser is not null) embed.WithFooter($"Player to make a choice: {bj.CurrentUser.DiscordUser}");
 
                 foreach (var p in bj.Players)
                 {

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

@@ -140,7 +140,7 @@ public class Blackjack
     {
         var cu = CurrentUser;
 
-        if (cu != null && cu.DiscordUser == u)
+        if (cu is not null && cu.DiscordUser == u)
             return await Stand(cu);
 
         return false;
@@ -221,7 +221,7 @@ public class Blackjack
     {
         var cu = CurrentUser;
 
-        if (cu != null && cu.DiscordUser == u)
+        if (cu is not null && cu.DiscordUser == u)
             return await Double(cu);
 
         return false;
@@ -268,7 +268,7 @@ public class Blackjack
     {
         var cu = CurrentUser;
 
-        if (cu != null && cu.DiscordUser == u)
+        if (cu is not null && cu.DiscordUser == u)
             return await Hit(cu);
 
         return false;

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

@@ -78,8 +78,8 @@ public class GameStatusEvent : ICurrencyEvent
         try
         {
             await _cs.AddBulkAsync(toAward,
-                toAward.Select(x => "GameStatus Event"),
-                toAward.Select(x => _amount),
+                toAward.Select(_ => "GameStatus Event"),
+                toAward.Select(_ => _amount),
                 true);
 
             if (_isPotLimited)

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

@@ -73,7 +73,7 @@ public class ReactionEvent : ICurrencyEvent
 
         try
         {
-            await _cs.AddBulkAsync(toAward, toAward.Select(x => "Reaction Event"), toAward.Select(x => _amount), true);
+            await _cs.AddBulkAsync(toAward, toAward.Select(_ => "Reaction Event"), toAward.Select(_ => _amount), true);
 
             if (_isPotLimited)
                 await _msg.ModifyAsync(m =>

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

@@ -133,7 +133,7 @@ public sealed class Connect4Game : IDisposable
             }
 
             CurrentPhase = Phase.P1Move; //start the game
-            _playerTimeoutTimer = new(async state =>
+            _playerTimeoutTimer = new(async _ =>
                 {
                     await _locker.WaitAsync();
                     try
@@ -347,7 +347,7 @@ public sealed class Connect4Game : IDisposable
             return;
         }
 
-        if (winId != null)
+        if (winId is not null)
             _cs.AddAsync(winId.Value, "Connnect4-win", (long)(_options.Bet * 1.98), true);
     }
 

src/NadekoBot/Modules/Gambling/CurrencyRaffleCommands.cs

@@ -38,7 +38,7 @@ public partial class Gambling
 
             var res = await _service.JoinOrCreateGame(ctx.Channel.Id, ctx.User, amount, mixed, OnEnded);
 
-            if (res.Item1 != null)
+            if (res.Item1 is not null)
             {
                 await SendConfirmAsync(GetText(strs.rafflecur(res.Item1.GameType.ToString())),
                     string.Join("\n", res.Item1.Users.Select(x => $"{x.DiscordUser} ({x.Amount})")),

src/NadekoBot/Modules/Gambling/DrawCommands.cs

@@ -22,7 +22,7 @@ public partial class Gambling
             if (num is < 1 or > 10)
                 throw new ArgumentOutOfRangeException(nameof(num));
 
-            var cards = guildId is null ? new() : _allDecks.GetOrAdd(ctx.Guild, s => new());
+            var cards = guildId is null ? new() : _allDecks.GetOrAdd(ctx.Guild, _ => new());
             var images = new List<Image<Rgba32>>();
             var cardObjects = new List<Deck.Card>();
             for (var i = 0; i < num; i++)
@@ -53,7 +53,7 @@ public partial class Gambling
             if (cardObjects.Count == 5)
                 toSend += $" drew `{Deck.GetHandValue(cardObjects)}`";
 
-            if (guildId != null)
+            if (guildId is not null)
                 toSend += "\n" + GetText(strs.cards_left(Format.Bold(cards.CardPool.Count.ToString())));
 
             return (img.ToStream(), toSend);
@@ -97,8 +97,8 @@ public partial class Gambling
             //var channel = (ITextChannel)ctx.Channel;
 
             _allDecks.AddOrUpdate(ctx.Guild,
-                g => new(),
-                (g, c) =>
+                _ => new(),
+                (_, c) =>
                 {
                     c.Restart();
                     return c;

src/NadekoBot/Modules/Gambling/Gambling.cs

@@ -110,7 +110,7 @@ public partial class Gambling : GamblingModule<GamblingService>
         }
 
         TimeSpan? rem;
-        if ((rem = _cache.AddTimelyClaim(ctx.User.Id, period)) != null)
+        if ((rem = _cache.AddTimelyClaim(ctx.User.Id, period)) is not null)
         {
             await ReplyErrorLocalizedAsync(strs.timely_already_claimed(rem?.ToString(@"dd\d\ hh\h\ mm\m\ ss\s")));
             return;
@@ -308,8 +308,8 @@ public partial class Gambling : GamblingModule<GamblingService>
         var users = (await ctx.Guild.GetUsersAsync()).Where(u => u.GetRoles().Contains(role)).ToList();
 
         await _cs.AddBulkAsync(users.Select(x => x.Id),
-            users.Select(x => $"Awarded by bot owner to **{role.Name}** role. ({ctx.User.Username}/{ctx.User.Id})"),
-            users.Select(x => amount),
+            users.Select(_ => $"Awarded by bot owner to **{role.Name}** role. ({ctx.User.Username}/{ctx.User.Id})"),
+            users.Select(_ => amount),
             true);
 
         await ReplyConfirmLocalizedAsync(strs.mass_award(n(amount),
@@ -326,8 +326,8 @@ public partial class Gambling : GamblingModule<GamblingService>
         var users = (await role.GetMembersAsync()).ToList();
 
         await _cs.RemoveBulkAsync(users.Select(x => x.Id),
-            users.Select(x => $"Taken by bot owner from **{role.Name}** role. ({ctx.User.Username}/{ctx.User.Id})"),
-            users.Select(x => amount),
+            users.Select(_ => $"Taken by bot owner from **{role.Name}** role. ({ctx.User.Username}/{ctx.User.Id})"),
+            users.Select(_ => amount),
             true);
 
         await ReplyConfirmLocalizedAsync(strs.mass_take(n(amount),
@@ -532,7 +532,7 @@ public partial class Gambling : GamblingModule<GamblingService>
             await _tracker.EnsureUsersDownloadedAsync(ctx.Guild);
 
             var sg = (SocketGuild)ctx.Guild;
-            cleanRichest = cleanRichest.Where(x => sg.GetUser(x.UserId) != null).ToList();
+            cleanRichest = cleanRichest.Where(x => sg.GetUser(x.UserId) is not null).ToList();
         }
         else
         {

src/NadekoBot/Modules/Gambling/PlantAndPickCommands.cs

@@ -89,7 +89,7 @@ public partial class Gambling
             var enabledIn = _service.GetAllGeneratingChannels();
 
             return ctx.SendPaginatedConfirmAsync(page,
-                cur =>
+                _ =>
                 {
                     var items = enabledIn.Skip(page * 9).Take(9);
 

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

@@ -81,7 +81,7 @@ public class PlantPickService : INService
         else
         {
             var toDelete = guildConfig.GenerateCurrencyChannelIds.FirstOrDefault(x => x.Equals(toAdd));
-            if (toDelete != null) uow.Remove(toDelete);
+            if (toDelete is not null) uow.Remove(toDelete);
             _generationChannels.TryRemove(cid);
             enabled = false;
         }

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

@@ -66,7 +66,7 @@ public class VoteRewardService : INService, IReadyExecutor
 
                         await _currencyService.AddBulkAsync(ids,
                             data.Select(_ => "top.gg vote reward"),
-                            data.Select(x => _gamb.Data.VoteReward),
+                            data.Select(_ => _gamb.Data.VoteReward),
                             true);
 
                         Log.Information("Rewarding {Count} top.gg voters", ids.Count());
@@ -95,7 +95,7 @@ public class VoteRewardService : INService, IReadyExecutor
 
                         await _currencyService.AddBulkAsync(ids,
                             data.Select(_ => "discords.com vote reward"),
-                            data.Select(x => _gamb.Data.VoteReward),
+                            data.Select(_ => _gamb.Data.VoteReward),
                             true);
 
                         Log.Information("Rewarding {Count} discords.com voters", ids.Count());

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

@@ -125,7 +125,7 @@ public class WaifuService : INService
 
         //wives stay though
 
-        uow.SaveChanges();
+        await uow.SaveChangesAsync();
 
         return true;
     }
@@ -236,7 +236,7 @@ public class WaifuService : INService
             }
             else
             {
-                if (w.Affinity != null)
+                if (w.Affinity is not null)
                     oldAff = w.Affinity;
                 w.Affinity = newAff;
                 success = true;
@@ -270,11 +270,10 @@ public class WaifuService : INService
         DivorceResult result;
         TimeSpan? remaining = null;
         long amount = 0;
-        WaifuInfo w = null;
+        WaifuInfo w;
         await using (var uow = _db.GetDbContext())
         {
             w = uow.WaifuInfo.ByWaifuUserId(targetId);
-            var now = DateTime.UtcNow;
             if (w?.Claimer is null || w.Claimer.UserId != user.Id)
             {
                 result = DivorceResult.NotYourWife;
@@ -373,7 +372,7 @@ public class WaifuService : INService
     public WaifuInfoStats GetFullWaifuInfoAsync(IGuildUser target)
     {
         using var uow = _db.GetDbContext();
-        var du = uow.GetOrCreateUser(target);
+        _ = uow.GetOrCreateUser(target);
 
         return GetFullWaifuInfoAsync(target.Id);
     }

src/NadekoBot/Modules/Gambling/ShopCommands.cs

@@ -181,7 +181,7 @@ public partial class Gambling
                                                                                       .ThenInclude(x => x.Items))
                                                                               .ShopEntries);
                             entry = entries.ElementAtOrDefault(index);
-                            if (entry != null)
+                            if (entry is not null)
                                 if (entry.Items.Add(item))
                                     uow.SaveChanges();
                         }
@@ -281,7 +281,7 @@ public partial class Gambling
                                                                           .ThenInclude(x => x.Items))
                                                                   .ShopEntries);
                 entry = entries.ElementAtOrDefault(index);
-                if (entry != null && (rightType = entry.Type == ShopEntryType.List))
+                if (entry is not null && (rightType = entry.Type == ShopEntryType.List))
                     if (added = entry.Items.Add(item))
                         uow.SaveChanges();
             }
@@ -312,7 +312,7 @@ public partial class Gambling
 
                 var entries = new IndexedCollection<ShopEntry>(config.ShopEntries);
                 removed = entries.ElementAtOrDefault(index);
-                if (removed != null)
+                if (removed is not null)
                 {
                     uow.RemoveRange(removed.Items);
                     uow.Remove(removed);

src/NadekoBot/Modules/Gambling/WaifuClaimCommands.cs

@@ -159,7 +159,7 @@ public partial class Gambling
             var (oldAff, sucess, remaining) = await _service.ChangeAffinityAsync(ctx.User, u);
             if (!sucess)
             {
-                if (remaining != null)
+                if (remaining is not null)
                     await ReplyErrorLocalizedAsync(strs.waifu_affinity_cooldown(
                         Format.Bold(((int)remaining?.TotalHours).ToString()),
                         Format.Bold(remaining?.Minutes.ToString())));

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

@@ -66,7 +66,7 @@ public sealed class NunchiGame : IDisposable
                 return false;
             }
 
-            _killTimer = new(async state =>
+            _killTimer = new(async _ =>
                 {
                     await _locker.WaitAsync();
                     try
@@ -151,7 +151,7 @@ public sealed class NunchiGame : IDisposable
         _killTimer.Change(_killTimeout, _killTimeout);
         CurrentNumber = new NadekoRandom().Next(0, 100); // reset the counter
         _passed.Clear(); // reset all users who passed (new round starts)
-        if (failure != null)
+        if (failure is not null)
             _participants.Remove(failure.Value); // remove the dude who failed from the list of players
 
         var __ = OnRoundEnded?.Invoke(this, failure);

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

@@ -140,14 +140,14 @@ public class TicTacToe
                         return;
 
                     _phase = Phase.Ended;
-                    if (_users[1] != null)
+                    if (_users[1] is not null)
                     {
                         _winner = _users[_curUserIndex ^= 1];
                         var del = _previousMessage?.DeleteAsync();
                         try
                         {
                             await _channel.EmbedAsync(GetEmbed(GetText(strs.ttt_time_expired)));
-                            if (del != null)
+                            if (del is not null)
                                 await del;
                         }
                         catch { }
@@ -266,7 +266,7 @@ public class TicTacToe
 
                         try
                         {
-                            if (del2 != null) await del2;
+                            if (del2 is not null) await del2;
                         }
                         catch { }
                     });

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

@@ -220,7 +220,7 @@ public class TriviaGame
                         && CurrentQuestion.IsAnswerCorrect(umsg.Content)
                         && !_triviaCancelSource.IsCancellationRequested)
                     {
-                        Users.AddOrUpdate(guildUser, 1, (gu, old) => ++old);
+                        Users.AddOrUpdate(guildUser, 1, (_, old) => ++old);
                         guess = true;
                     }
                 }

src/NadekoBot/Modules/Games/PollCommands.cs

@@ -71,7 +71,7 @@ public partial class Games
 
         public IEmbedBuilder GetStats(Poll poll, string title)
         {
-            var results = poll.Votes.GroupBy(kvp => kvp.VoteIndex).ToDictionary(x => x.Key, x => x.Sum(kvp => 1));
+            var results = poll.Votes.GroupBy(kvp => kvp.VoteIndex).ToDictionary(x => x.Key, x => x.Sum(_ => 1));
 
             var totalVotesCast = results.Sum(x => x.Value);
 

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

@@ -41,7 +41,7 @@ public class ChatterBotService : IEarlyBehavior
 
         ChatterBotGuilds = new(bot.AllGuildConfigs.Where(gc => gc.CleverbotEnabled)
                                   .ToDictionary(gc => gc.GuildId,
-                                      gc => new Lazy<IChatterBotSession>(() => CreateSession(), true)));
+                                      _ => new Lazy<IChatterBotSession>(() => CreateSession(), true)));
     }
 
     public IChatterBotSession CreateSession()

src/NadekoBot/Modules/Games/SpeedTypingCommands.cs

@@ -27,7 +27,7 @@ public partial class Games
             var channel = (ITextChannel)ctx.Channel;
 
             var game = _service.RunningContests.GetOrAdd(ctx.Guild.Id,
-                id => new(_games, _client, channel, Prefix, options, _eb));
+                _ => new(_games, _client, channel, Prefix, options, _eb));
 
             if (game.IsActive)
                 await SendErrorAsync($"Contest already running in {game.Channel.Mention} channel.");

src/NadekoBot/Modules/Games/TicTacToeCommands.cs

@@ -39,7 +39,7 @@ public partial class Games
                 _service.TicTacToeGames.Add(channel.Id, game);
                 await ReplyConfirmLocalizedAsync(strs.ttt_created);
 
-                game.OnEnded += g =>
+                game.OnEnded += _ =>
                 {
                     _service.TicTacToeGames.Remove(channel.Id);
                     _sem.Dispose();

src/NadekoBot/Modules/Help/Help.cs

@@ -219,7 +219,7 @@ public partial class Help : NadekoModule<HelpService>
         }
 
         var cnt = 0;
-        var groups = cmdsWithGroup.GroupBy(x => cnt++ / 48).ToArray();
+        var groups = cmdsWithGroup.GroupBy(_ => cnt++ / 48).ToArray();
         var embed = _eb.Create().WithOkColor();
         foreach (var g in groups)
         {
@@ -259,7 +259,7 @@ public partial class Help : NadekoModule<HelpService>
     {
         var prefixless =
             _cmds.Commands.FirstOrDefault(x => x.Aliases.Any(cmdName => cmdName.ToLowerInvariant() == fail));
-        if (prefixless != null)
+        if (prefixless is not null)
         {
             await H(prefixless);
             return;
@@ -316,7 +316,7 @@ public partial class Help : NadekoModule<HelpService>
                                          var opt = ((NadekoOptionsAttribute)com.Attributes.FirstOrDefault(x
                                                  => x is NadekoOptionsAttribute))
                                              ?.OptionType;
-                                         if (opt != null) optHelpStr = HelpService.GetCommandOptionHelpList(opt);
+                                         if (opt is not null) optHelpStr = HelpService.GetCommandOptionHelpList(opt);
 
                                          return new CommandJsonObject
                                          {

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

@@ -60,7 +60,7 @@ public class HelpService : ILateExecutor, INService
 
         var str = $"**`{prefix + com.Aliases.First()}`**";
         var alias = com.Aliases.Skip(1).FirstOrDefault();
-        if (alias != null)
+        if (alias is not null)
             str += $" **/ `{prefix + alias}`**";
         var em = _eb.Create().AddField(str, $"{com.RealSummary(_strings, guild?.Id, prefix)}", true);
 
@@ -75,7 +75,7 @@ public class HelpService : ILateExecutor, INService
           .WithOkColor();
 
         var opt = ((NadekoOptionsAttribute)com.Attributes.FirstOrDefault(x => x is NadekoOptionsAttribute))?.OptionType;
-        if (opt != null)
+        if (opt is not null)
         {
             var hs = GetCommandOptionHelp(opt);
             if (!string.IsNullOrWhiteSpace(hs))
@@ -96,7 +96,7 @@ public class HelpService : ILateExecutor, INService
     {
         var strs = opt.GetProperties()
                       .Select(x => x.GetCustomAttributes(true).FirstOrDefault(a => a is OptionAttribute))
-                      .Where(x => x != null)
+                      .Where(x => x is not null)
                       .Cast<OptionAttribute>()
                       .Select(x =>
                       {

src/NadekoBot/Modules/Music/PlaylistCommands.cs

@@ -68,7 +68,7 @@ public sealed partial class Music
                 await using var uow = _db.GetDbContext();
                 var pl = uow.MusicPlaylists.FirstOrDefault(x => x.Id == id);
 
-                if (pl != null)
+                if (pl is not null)
                     if (_creds.IsOwner(ctx.User) || pl.AuthorId == ctx.User.Id)
                     {
                         uow.MusicPlaylists.Remove(pl);
@@ -212,7 +212,7 @@ public sealed partial class Music
                 await mp.EnqueueManyAsync(mpl.Songs.Select(x => (x.Query, (MusicPlatform)x.ProviderType)),
                     ctx.User.ToString());
 
-                if (msg != null) await msg.ModifyAsync(m => m.Content = GetText(strs.playlist_queue_complete));
+                if (msg is not null) await msg.ModifyAsync(m => m.Content = GetText(strs.playlist_queue_complete));
             }
             finally
             {

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

@@ -176,7 +176,7 @@ public sealed class AyuVoiceStateService : INService
             }
 
             var current = _voiceProxies.AddOrUpdate(guildId,
-                gid => new VoiceProxy(CreateVoiceGatewayLocal()),
+                _ => new VoiceProxy(CreateVoiceGatewayLocal()),
                 (gid, currentProxy) =>
                 {
                     _ = currentProxy.StopGateway();

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

@@ -214,7 +214,7 @@ public sealed class MusicService : IMusicService
     }
 
     private Func<IMusicPlayer, Task> OnQueueStopped(ulong guildId)
-        => mp =>
+        => _ =>
         {
             if (_settings.TryGetValue(guildId, out var settings))
                 if (settings.AutoDisconnect)
@@ -355,7 +355,7 @@ public sealed class MusicService : IMusicService
             },
             channelId);
 
-        _outputChannels.AddOrUpdate(guildId, (channel, channel), (key, old) => (old.Default, channel));
+        _outputChannels.AddOrUpdate(guildId, (channel, channel), (_, old) => (old.Default, channel));
 
         return true;
     }

src/NadekoBot/Modules/Nsfw/Nsfw.cs

@@ -75,7 +75,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
         if (interval < 20)
             return;
 
-        t = new(async state =>
+        t = new(async _ =>
             {
                 try
                 {
@@ -101,7 +101,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
 
         _service.AutoHentaiTimers.AddOrUpdate(ctx.Channel.Id,
             t,
-            (key, old) =>
+            (_, old) =>
             {
                 old.Change(Timeout.Infinite, Timeout.Infinite);
                 return t;
@@ -130,7 +130,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
         if (interval < 20)
             return;
 
-        t = new(async state =>
+        t = new(async _ =>
             {
                 try
                 {
@@ -147,7 +147,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
 
         _service.AutoBoobTimers.AddOrUpdate(ctx.Channel.Id,
             t,
-            (key, old) =>
+            (_, old) =>
             {
                 old.Change(Timeout.Infinite, Timeout.Infinite);
                 return t;
@@ -176,7 +176,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
         if (interval < 20)
             return;
 
-        t = new(async state =>
+        t = new(async _ =>
             {
                 try
                 {
@@ -193,7 +193,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
 
         _service.AutoButtTimers.AddOrUpdate(ctx.Channel.Id,
             t,
-            (key, old) =>
+            (_, old) =>
             {
                 old.Change(Timeout.Infinite, Timeout.Infinite);
                 return t;
@@ -222,7 +222,7 @@ public partial class NSFW : NadekoModule<ISearchImagesService>
                 _service.Konachan(ctx.Guild?.Id, true, tags),
                 _service.Gelbooru(ctx.Guild?.Id, true, tags));
 
-            var linksEnum = images.Where(l => l != null).ToArray();
+            var linksEnum = images.Where(l => l is not null).ToArray();
             if (!linksEnum.Any())
             {
                 await ReplyErrorLocalizedAsync(strs.no_results);

src/NadekoBot/Modules/Permissions/CmdCdsCommands.cs

@@ -45,7 +45,7 @@ public partial class Permissions
                 var localSet = CommandCooldowns.GetOrAdd(channel.Guild.Id, new ConcurrentHashSet<CommandCooldown>());
 
                 var toDelete = config.CommandCooldowns.FirstOrDefault(cc => cc.CommandName == name);
-                if (toDelete != null)
+                if (toDelete is not null)
                     uow.Set<CommandCooldown>().Remove(toDelete);
                 localSet.RemoveWhere(cc => cc.CommandName == name);
                 if (secs != 0)

src/NadekoBot/Modules/Permissions/Permissions.cs

@@ -42,7 +42,7 @@ public partial class Permissions : NadekoModule<PermissionService>
     [Priority(0)]
     public async partial Task PermRole([Leftover] IRole role = null)
     {
-        if (role != null && role == role.Guild.EveryoneRole)
+        if (role is not null && role == role.Guild.EveryoneRole)
             return;
 
         if (role is null)

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

@@ -38,7 +38,7 @@ public sealed class BlacklistService : IEarlyBehavior
     {
         foreach (var bl in _blacklist)
         {
-            if (guild != null && bl.Type == BlacklistType.Server && bl.ItemId == guild.Id)
+            if (guild is not null && bl.Type == BlacklistType.Server && bl.ItemId == guild.Id)
             {
                 Log.Information("Blocked input from blacklisted guild: {GuildName} [{GuildId}]", guild.Name, guild.Id);
 

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

@@ -22,10 +22,10 @@ public class CmdCdService : ILateBlocker, INService
 
         var cmdcds = CommandCooldowns.GetOrAdd(guild.Id, new ConcurrentHashSet<CommandCooldown>());
         CommandCooldown cdRule;
-        if ((cdRule = cmdcds.FirstOrDefault(cc => cc.CommandName == commandName)) != null)
+        if ((cdRule = cmdcds.FirstOrDefault(cc => cc.CommandName == commandName)) is not null)
         {
             var activeCdsForGuild = ActiveCooldowns.GetOrAdd(guild.Id, new ConcurrentHashSet<ActiveCooldown>());
-            if (activeCdsForGuild.FirstOrDefault(ac => ac.UserId == user.Id && ac.Command == commandName) != null)
+            if (activeCdsForGuild.FirstOrDefault(ac => ac.UserId == user.Id && ac.Command == commandName) is not null)
                 return Task.FromResult(true);
 
             activeCdsForGuild.Add(new() { UserId = user.Id, Command = commandName });

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

@@ -82,7 +82,7 @@ public class PermissionService : ILateBlocker, INService
                 PermRole = config.PermissionRole,
                 Verbose = config.VerbosePermissions
             },
-            (id, old) =>
+            (_, old) =>
             {
                 old.Permissions = new(config.Permissions);
                 old.PermRole = config.PermissionRole;

src/NadekoBot/Modules/Searches/Searches.cs

@@ -700,7 +700,7 @@ public partial class Searches : NadekoModule<SearchesService>
         {
         }
 
-        if (obj.Error != null || obj.Verses is null || obj.Verses.Length == 0)
+        if (obj.Error is not null || obj.Verses is null || obj.Verses.Length == 0)
         {
             await SendErrorAsync(obj.Error ?? "No verse found.");
         }

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

@@ -72,13 +72,13 @@ public class AnimeSearchService : INService
 
                 var genres = document.QuerySelector("div#seriesgenre")
                                      .Children.Select(x => x as IHtmlAnchorElement)
-                                     .Where(x => x != null)
+                                     .Where(x => x is not null)
                                      .Select(x => $"[{x.InnerHtml}]({x.Href})")
                                      .ToArray();
 
                 var authors = document.QuerySelector("div#showauthors")
                                       .Children.Select(x => x as IHtmlAnchorElement)
-                                      .Where(x => x != null)
+                                      .Where(x => x is not null)
                                       .Select(x => $"[{x.InnerHtml}]({x.Href})")
                                       .ToArray();
 

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

@@ -45,7 +45,7 @@ public class CryptoService : INService
             crypto = nearest?.Elem;
         }
 
-        if (nearest != null) return (null, crypto);
+        if (nearest is not null) return (null, crypto);
 
         return (crypto, null);
     }

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

@@ -108,10 +108,10 @@ public class FeedsService : INService
                                 previewElement = afi.Element.Elements()
                                                     .FirstOrDefault(x => x.Name.LocalName == "thumbnail");
 
-                            if (previewElement != null)
+                            if (previewElement is not null)
                             {
                                 var urlAttribute = previewElement.Attribute("url");
-                                if (urlAttribute != null
+                                if (urlAttribute is not null
                                     && !string.IsNullOrWhiteSpace(urlAttribute.Value)
                                     && Uri.IsWellFormedUriString(urlAttribute.Value, UriKind.Absolute))
                                 {
@@ -129,10 +129,10 @@ public class FeedsService : INService
                             embed.WithDescription(desc.TrimTo(2048));
 
                         //send the created embed to all subscribed channels
-                        var feedSendTasks = kvp.Value.Where(x => x.GuildConfig != null)
+                        var feedSendTasks = kvp.Value.Where(x => x.GuildConfig is not null)
                                                .Select(x => _client.GetGuild(x.GuildConfig.GuildId)
                                                                    ?.GetTextChannel(x.ChannelId))
-                                               .Where(x => x != null)
+                                               .Where(x => x is not null)
                                                .Select(x => x.EmbedAsync(embed));
 
                         allSendTasks.Add(feedSendTasks.WhenAll());
@@ -174,7 +174,7 @@ public class FeedsService : INService
         foreach (var feed in gc.FeedSubs)
             _subs.AddOrUpdate(feed.Url.ToLower(),
                 new HashSet<FeedSub> { feed },
-                (k, old) =>
+                (_, old) =>
                 {
                     old.Add(feed);
                     return old;
@@ -198,7 +198,7 @@ public class FeedsService : INService
         var toRemove = items[index];
         _subs.AddOrUpdate(toRemove.Url.ToLower(),
             new HashSet<FeedSub>(),
-            (key, old) =>
+            (_, old) =>
             {
                 old.Remove(toRemove);
                 return old;

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

@@ -549,7 +549,7 @@ public class SearchesService : INService
 
                                return new GoogleSearchResult(name, href, txt);
                            })
-                           .Where(x => x != null)
+                           .Where(x => x is not null)
                            .ToList();
 
         return new(results.AsReadOnly(), fullQueryLink, totalResults);
@@ -596,7 +596,7 @@ public class SearchesService : INService
 
                                return new GoogleSearchResult(name, href, txt);
                            })
-                           .Where(x => x != null)
+                           .Where(x => x is not null)
                            .ToList();
 
         return new(results.AsReadOnly(), fullQueryLink, "0");

src/NadekoBot/Modules/Utility/CommandMapCommands.cs

@@ -54,7 +54,7 @@ public partial class Utility
                     var config = uow.GuildConfigsForId(ctx.Guild.Id, set => set.Include(x => x.CommandAliases));
                     var toAdd = new CommandAlias { Mapping = mapping, Trigger = trigger };
                     var tr = config.CommandAliases.FirstOrDefault(x => x.Trigger == trigger);
-                    if (tr != null)
+                    if (tr is not null)
                         uow.Set<CommandAlias>().Remove(tr);
                     uow.SaveChanges();
                 }
@@ -91,7 +91,7 @@ public partial class Utility
                         uow.SaveChanges();
                     }
 
-                    map.AddOrUpdate(trigger, mapping, (key, old) => mapping);
+                    map.AddOrUpdate(trigger, mapping, (_, _) => mapping);
                     return map;
                 });
 

src/NadekoBot/Modules/Utility/InfoCommands.cs

@@ -103,7 +103,7 @@ public partial class Utility
                  .WithOkColor();
 
             var av = user.RealAvatarUrl();
-            if (av != null && av.IsAbsoluteUri)
+            if (av is not null && av.IsAbsoluteUri)
                 embed.WithThumbnailUrl(av.ToString());
             await ctx.Channel.EmbedAsync(embed);
         }

src/NadekoBot/Modules/Utility/QuoteCommands.cs

@@ -83,7 +83,7 @@ public partial class Utility
             await using (var uow = _db.GetDbContext())
             {
                 quote = await uow.Quotes.GetRandomQuoteByKeywordAsync(ctx.Guild.Id, keyword);
-                //if (quote != null)
+                //if (quote is not null)
                 //{
                 //    quote.UseCount += 1;
                 //    uow.Complete();

src/NadekoBot/Modules/Utility/RemindCommands.cs

@@ -181,7 +181,7 @@ public partial class Utility
             if (ts > TimeSpan.FromDays(60))
                 return false;
 
-            if (ctx.Guild != null)
+            if (ctx.Guild is not null)
             {
                 var perms = ((IGuildUser)ctx.User).GetPermissions((IGuildChannel)ctx.Channel);
                 if (!perms.MentionEveryone) message = message.SanitizeAllMentions();

src/NadekoBot/Modules/Utility/RepeatCommands.cs

@@ -102,7 +102,7 @@ public partial class Utility
                 interval?.Time ?? (startTimeOfDay is null ? TimeSpan.FromMinutes(5) : TimeSpan.FromDays(1));
 
             if (string.IsNullOrWhiteSpace(message)
-                || (interval != null
+                || (interval is not null
                     && (interval.Time > TimeSpan.FromMinutes(25000) || interval.Time < TimeSpan.FromMinutes(1))))
                 return;
 

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

@@ -56,7 +56,7 @@ public class CommandMapService : IInputTransformer, INService
         if (guild is null || string.IsNullOrWhiteSpace(input))
             return input;
 
-        if (guild != null)
+        if (guild is not null)
             if (AliasMaps.TryGetValue(guild.Id, out var maps))
             {
                 var keys = maps.Keys.OrderByDescending(x => x.Length);

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

@@ -212,7 +212,7 @@ where ((guildid >> 22) % {_creds.TotalShards}) == {_client.ShardId};")
             try
             {
                 var lastMsgInChannel = await channel.GetMessagesAsync(2).Flatten().FirstAsync();
-                if (lastMsgInChannel != null && lastMsgInChannel.Id == repeater.LastMessageId)
+                if (lastMsgInChannel is not null && lastMsgInChannel.Id == repeater.LastMessageId)
                     return;
             }
             catch (Exception ex)
@@ -228,7 +228,7 @@ where ((guildid >> 22) % {_creds.TotalShards}) == {_client.ShardId};")
             try
             {
                 var oldMsg = await channel.GetMessageAsync(lastMessageId);
-                if (oldMsg != null) await oldMsg.DeleteAsync();
+                if (oldMsg is not null) await oldMsg.DeleteAsync();
             }
             catch (Exception ex)
             {

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

@@ -21,7 +21,7 @@ public sealed class RunningRepeater
 
     private DateTime CalculateInitialExecution()
     {
-        if (Repeater.StartTimeOfDay != null)
+        if (Repeater.StartTimeOfDay is not null)
         {
             // if there was a start time of day
             // calculate whats the next time of day repeat should trigger at

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

@@ -77,7 +77,7 @@ public class StreamRoleService : INService
                 if (action == AddRemove.Rem)
                 {
                     var toDelete = streamRoleSettings.Whitelist.FirstOrDefault(x => x.Equals(userObj));
-                    if (toDelete != null)
+                    if (toDelete is not null)
                     {
                         uow.Remove(toDelete);
                         success = true;
@@ -95,7 +95,7 @@ public class StreamRoleService : INService
                 if (action == AddRemove.Rem)
                 {
                     var toRemove = streamRoleSettings.Blacklist.FirstOrDefault(x => x.Equals(userObj));
-                    if (toRemove != null)
+                    if (toRemove is not null)
                     {
                         success = true;
                         success = streamRoleSettings.Blacklist.Remove(toRemove);
@@ -299,5 +299,5 @@ public class StreamRoleService : INService
     }
 
     private void UpdateCache(ulong guildId, StreamRoleSettings setting)
-        => guildSettings.AddOrUpdate(guildId, key => setting, (key, old) => setting);
+        => guildSettings.AddOrUpdate(guildId, _ => setting, (_, _) => setting);
 }

src/NadekoBot/Modules/Utility/Utility.cs

@@ -90,7 +90,7 @@ public partial class Utility : NadekoModule
                                                   .Where(u => u.Activities.FirstOrDefault()?.Name?.ToUpperInvariant()
                                                               == game)
                                                   .Select(u => u.Username)
-                                                  .OrderBy(x => rng.Next())
+                                                  .OrderBy(_ => rng.Next())
                                                   .Take(60)
                                                   .ToArray());
 
@@ -100,7 +100,7 @@ public partial class Utility : NadekoModule
         else
             await SendConfirmAsync("```css\n"
                                    + string.Join("\n",
-                                       arr.GroupBy(item => i++ / 2)
+                                       arr.GroupBy(_ => i++ / 2)
                                           .Select(ig => string.Concat(ig.Select(el => $"• {el,-27}"))))
                                    + "\n```");
     }
@@ -198,7 +198,7 @@ public partial class Utility : NadekoModule
         if (page is < 1 or > 100)
             return;
 
-        if (target != null)
+        if (target is not null)
         {
             var roles = target.GetRoles()
                               .Except(new[] { guild.EveryoneRole })

src/NadekoBot/Modules/Xp/Club.cs

@@ -18,7 +18,7 @@ public partial class Xp
         {
             var club = _service.TransferClub(ctx.User, newOwner);
 
-            if (club != null)
+            if (club is not null)
                 await ReplyConfirmLocalizedAsync(strs.club_transfered(Format.Bold(club.Name),
                     Format.Bold(newOwner.ToString())));
             else
@@ -66,7 +66,7 @@ public partial class Xp
         [Cmd]
         public async partial Task ClubIcon([Leftover] string url = null)
         {
-            if ((!Uri.IsWellFormedUriString(url, UriKind.Absolute) && url != null)
+            if ((!Uri.IsWellFormedUriString(url, UriKind.Absolute) && url is not null)
                 || !await _service.SetClubIcon(ctx.User.Id, url is null ? null : new Uri(url)))
             {
                 await ReplyErrorLocalizedAsync(strs.club_icon_error);
@@ -166,7 +166,7 @@ public partial class Xp
             var bans = club.Bans.Select(x => x.User).ToArray();
 
             return ctx.SendPaginatedConfirmAsync(page,
-                curPage =>
+                _ =>
                 {
                     var toShow = string.Join("\n", bans.Skip(page * 10).Take(10).Select(x => x.ToString()));
 
@@ -193,7 +193,7 @@ public partial class Xp
             var apps = club.Applicants.Select(x => x.User).ToArray();
 
             return ctx.SendPaginatedConfirmAsync(page,
-                curPage =>
+                _ =>
                 {
                     var toShow = string.Join("\n", apps.Skip(page * 10).Take(10).Select(x => x.ToString()));
 

src/NadekoBot/Modules/Xp/Services/ClubService.cs

@@ -88,7 +88,7 @@ public class ClubService : INService
 
     public async Task<bool> SetClubIcon(ulong ownerUserId, Uri url)
     {
-        if (url != null)
+        if (url is not null)
         {
             using var http = _httpFactory.CreateClient();
             using var temp = await http.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
@@ -134,7 +134,7 @@ public class ClubService : INService
         var du = uow.GetOrCreateUser(user);
         uow.SaveChanges();
 
-        if (du.Club != null
+        if (du.Club is not null
             || new LevelStats(du.TotalXp).Level < club.MinimumLevelReq
             || club.Bans.Any(x => x.UserId == du.Id)
             || club.Applicants.Any(x => x.UserId == du.Id))
@@ -258,7 +258,7 @@ public class ClubService : INService
         club.Users.Remove(usr);
 
         var app = club.Applicants.FirstOrDefault(x => x.UserId == usr.Id);
-        if (app != null)
+        if (app is not null)
             club.Applicants.Remove(app);
 
         uow.SaveChanges();
@@ -299,7 +299,7 @@ public class ClubService : INService
 
         club.Users.Remove(usr);
         var app = club.Applicants.FirstOrDefault(x => x.UserId == usr.Id);
-        if (app != null)
+        if (app is not null)
             club.Applicants.Remove(app);
         uow.SaveChanges();
 

src/NadekoBot/Modules/Xp/Services/XpService.cs

@@ -90,7 +90,7 @@ public class XpService : INService
                 });
 
         //load settings
-        var allGuildConfigs = bot.AllGuildConfigs.Where(x => x.XpSettings != null).ToList();
+        var allGuildConfigs = bot.AllGuildConfigs.Where(x => x.XpSettings is not null).ToList();
 
         _excludedChannels = allGuildConfigs.ToDictionary(x => x.GuildId,
                                                x => new ConcurrentHashSet<ulong>(x.XpSettings.ExclusionList
@@ -156,7 +156,7 @@ public class XpService : INService
                         var oldGuildLevelData = new LevelStats(usr.Xp + usr.AwardedXp);
                         usr.Xp += xp;
                         du.TotalXp += xp;
-                        if (du.Club != null) du.Club.Xp += xp;
+                        if (du.Club is not null) du.Club.Xp += xp;
                         var newGuildLevelData = new LevelStats(usr.Xp + usr.AwardedXp);
 
                         if (oldGlobalLevelData.Level < newGlobalLevelData.Level)
@@ -194,7 +194,7 @@ public class XpService : INService
                             for (var i = oldGuildLevelData.Level + 1; i <= newGuildLevelData.Level; i++)
                             {
                                 var rrew = rrews.FirstOrDefault(x => x.Level == i);
-                                if (rrew != null)
+                                if (rrew is not null)
                                 {
                                     var role = first.User.Guild.GetRole(rrew.RoleId);
                                     if (role is not null)
@@ -208,7 +208,7 @@ public class XpService : INService
 
                                 //get currency reward for this level
                                 var crew = crews.FirstOrDefault(x => x.Level == i);
-                                if (crew != null)
+                                if (crew is not null)
                                     //give the user the reward if it exists
                                     await _cs.AddAsync(item.Key.User.Id, "Level-up Reward", crew.Amount);
                             }
@@ -228,7 +228,7 @@ public class XpService : INService
                                                       Format.Bold(x.Level.ToString()),
                                                       Format.Bold(x.Guild.ToString() ?? "-")),
                                                   x.Guild.Id));
-                                      else if (x.MessageChannel != null) // channel
+                                      else if (x.MessageChannel is not null) // channel
                                           await x.MessageChannel.SendConfirmAsync(_eb,
                                               _strings.GetText(strs.level_up_channel(x.User.Mention,
                                                       Format.Bold(x.Level.ToString())),
@@ -289,7 +289,7 @@ public class XpService : INService
         if (amount <= 0)
         {
             var toRemove = settings.CurrencyRewards.FirstOrDefault(x => x.Level == level);
-            if (toRemove != null)
+            if (toRemove is not null)
             {
                 uow.Remove(toRemove);
                 settings.CurrencyRewards.Remove(toRemove);
@@ -299,7 +299,7 @@ public class XpService : INService
         {
             var rew = settings.CurrencyRewards.FirstOrDefault(x => x.Level == level);
 
-            if (rew != null)
+            if (rew is not null)
                 rew.Amount = amount;
             else
                 settings.CurrencyRewards.Add(new() { Level = level, Amount = amount });
@@ -326,7 +326,7 @@ public class XpService : INService
         var settings = uow.XpSettingsFor(guildId);
 
         var toRemove = settings.RoleRewards.FirstOrDefault(x => x.Level == level);
-        if (toRemove != null)
+        if (toRemove is not null)
         {
             uow.Remove(toRemove);
             settings.RoleRewards.Remove(toRemove);
@@ -347,7 +347,7 @@ public class XpService : INService
 
         var rew = settings.RoleRewards.FirstOrDefault(x => x.Level == level);
 
-        if (rew != null)
+        if (rew is not null)
         {
             rew.RoleId = roleId;
             rew.Remove = remove;
@@ -424,9 +424,9 @@ public class XpService : INService
 
         var _ = Task.Run(() =>
         {
-            if (before.VoiceChannel != null) ScanChannelForVoiceXp(before.VoiceChannel);
+            if (before.VoiceChannel is not null) ScanChannelForVoiceXp(before.VoiceChannel);
 
-            if (after.VoiceChannel != null && after.VoiceChannel != before.VoiceChannel)
+            if (after.VoiceChannel is not null && after.VoiceChannel != before.VoiceChannel)
                 ScanChannelForVoiceXp(after.VoiceChannel);
             else if (after.VoiceChannel is null)
                 // In this case, the user left the channel and the previous for loops didn't catch
@@ -634,7 +634,7 @@ public class XpService : INService
         roles.TryRemove(rId);
 
         var toDelete = xpSetting.ExclusionList.FirstOrDefault(x => x.Equals(excludeObj));
-        if (toDelete != null)
+        if (toDelete is not null)
         {
             uow.Remove(toDelete);
             uow.SaveChanges();
@@ -822,7 +822,7 @@ public class XpService : INService
                         new(_template.User.TimeOnLevel.Guild.Pos.X, _template.User.TimeOnLevel.Guild.Pos.Y)));
             //avatar
 
-            if (stats.User.AvatarId != null && _template.User.Icon.Show)
+            if (stats.User.AvatarId is not null && _template.User.Icon.Show)
                 try
                 {
                     var avatarUrl = stats.User.RealAvatarUrl();

src/NadekoBot/Modules/Xp/Xp.cs

@@ -247,13 +247,13 @@ public partial class Xp : NadekoModule<XpService>
         var serverExcluded = _service.IsServerExcluded(ctx.Guild.Id);
         var roles = _service.GetExcludedRoles(ctx.Guild.Id)
                             .Select(x => ctx.Guild.GetRole(x))
-                            .Where(x => x != null)
+                            .Where(x => x is not null)
                             .Select(x => $"`role`   {x.Mention}")
                             .ToList();
 
         var chans = (await _service.GetExcludedChannels(ctx.Guild.Id)
                                    .Select(x => ctx.Guild.GetChannelAsync(x))
-                                   .WhenAll()).Where(x => x != null)
+                                   .WhenAll()).Where(x => x is not null)
                                               .Select(x => $"`channel` <#{x.Id}>")
                                               .ToList();
 

src/NadekoBot/Services/CommandHandler.cs

@@ -61,7 +61,7 @@ public class CommandHandler : INService
             GLOBAL_COMMANDS_COOLDOWN,
             GLOBAL_COMMANDS_COOLDOWN);
 
-        _prefixes = bot.AllGuildConfigs.Where(x => x.Prefix != null)
+        _prefixes = bot.AllGuildConfigs.Where(x => x.Prefix is not null)
                        .ToDictionary(x => x.GuildId, x => x.Prefix)
                        .ToConcurrent();
     }
@@ -111,7 +111,7 @@ public class CommandHandler : INService
 
     public async Task ExecuteExternal(ulong? guildId, ulong channelId, string commandText)
     {
-        if (guildId != null)
+        if (guildId is not null)
         {
             var guild = _client.GetGuild(guildId.Value);
             if (guild?.GetChannel(channelId) is not SocketTextChannel channel)
@@ -210,7 +210,7 @@ public class CommandHandler : INService
             {
 #if !GLOBAL_NADEKO
                 // track how many messagges each user is sending
-                UserMessagesSent.AddOrUpdate(usrMsg.Author.Id, 1, (key, old) => ++old);
+                UserMessagesSent.AddOrUpdate(usrMsg.Author.Id, 1, (_, old) => ++old);
 #endif
 
                 var channel = msg.Channel;
@@ -221,7 +221,7 @@ public class CommandHandler : INService
             catch (Exception ex)
             {
                 Log.Warning(ex, "Error in CommandHandler");
-                if (ex.InnerException != null)
+                if (ex.InnerException is not null)
                     Log.Warning(ex.InnerException, "Inner Exception of the error in CommandHandler");
             }
         });
@@ -260,10 +260,10 @@ public class CommandHandler : INService
                 return;
             }
 
-            if (error != null)
+            if (error is not null)
             {
                 LogErroredExecution(error, usrMsg, channel as ITextChannel, blockTime, startTime);
-                if (guild != null)
+                if (guild is not null)
                     await CommandErrored(info, channel as ITextChannel, error);
             }
         }
@@ -384,7 +384,7 @@ public class CommandHandler : INService
         var chosenOverload = successfulParses[0];
         var execResult = (ExecuteResult)await chosenOverload.Key.ExecuteAsync(context, chosenOverload.Value, services);
 
-        if (execResult.Exception != null
+        if (execResult.Exception is not null
             && (execResult.Exception is not HttpException he
                 || he.DiscordCode != DiscordErrorCode.InsufficientPermissions))
             Log.Warning(execResult.Exception, "Command Error");

src/NadekoBot/Services/Impl/Localization.cs

@@ -40,7 +40,7 @@ public class Localization : ILocalization, INService
 
                                                         return cultureInfo;
                                                     })
-                                                .Where(x => x.Value != null));
+                                                .Where(x => x.Value is not null));
     }
 
     public void SetGuildCulture(IGuild guild, CultureInfo ci)
@@ -61,7 +61,7 @@ public class Localization : ILocalization, INService
             uow.SaveChanges();
         }
 
-        GuildCultureInfos.AddOrUpdate(guildId, ci, (id, old) => ci);
+        GuildCultureInfos.AddOrUpdate(guildId, ci, (_, _) => ci);
     }
 
     public void RemoveGuildCulture(IGuild guild)

src/NadekoBot/Services/Impl/RedisCache.cs

@@ -38,7 +38,7 @@ public class RedisCache : IDataCache
     {
         var _db = Redis.GetDatabase();
         byte[] x = await _db.StringGetAsync("image_" + key);
-        return (x != null, x);
+        return (x is not null, x);
     }
 
     public Task SetImageDataAsync(Uri key, byte[] data)
@@ -51,7 +51,7 @@ public class RedisCache : IDataCache
     {
         var _db = Redis.GetDatabase();
         string x = await _db.StringGetAsync("anime_" + key);
-        return (x != null, x);
+        return (x is not null, x);
     }
 
     public Task SetAnimeDataAsync(string key, string data)
@@ -64,7 +64,7 @@ public class RedisCache : IDataCache
     {
         var _db = Redis.GetDatabase();
         string x = await _db.StringGetAsync("novel_" + key);
-        return (x != null, x);
+        return (x is not null, x);
     }
 
     public Task SetNovelDataAsync(string key, string data)
@@ -156,7 +156,7 @@ public class RedisCache : IDataCache
     public bool TryGetEconomy(out string data)
     {
         var _db = Redis.GetDatabase();
-        if ((data = _db.StringGet($"{_redisKey}_economy")) != null) return true;
+        if ((data = _db.StringGet($"{_redisKey}_economy")) is not null) return true;
 
         return false;
     }

src/NadekoBot/Services/Impl/StatsService.cs

@@ -132,7 +132,7 @@ public class StatsService : IStatsService, IReadyExecutor, INService, IDisposabl
             return Task.CompletedTask;
         };
 
-        _botlistTimer = new(async state =>
+        _botlistTimer = new(async _ =>
             {
                 if (string.IsNullOrWhiteSpace(_creds.BotListToken))
                     return;

src/NadekoBot/Services/Impl/YtdlOperation.cs

@@ -67,7 +67,7 @@ public class YtdlOperation
         process.Start();
 
         string line;
-        while ((line = await process.StandardOutput.ReadLineAsync()) != null)
+        while ((line = await process.StandardOutput.ReadLineAsync()) is not null)
             yield return line;
     }
 }

src/NadekoBot/_Extensions/Extensions.cs

@@ -139,7 +139,7 @@ public static class Extensions
 
     public static IEmbedBuilder AddPaginatedFooter(this IEmbedBuilder embed, int curPage, int? lastPage)
     {
-        if (lastPage != null)
+        if (lastPage is not null)
             return embed.WithFooter($"{curPage + 1} / {lastPage + 1}");
         return embed.WithFooter(curPage.ToString());
     }
@@ -196,7 +196,7 @@ public static class Extensions
         Task.Run(async () =>
         {
             await Task.Delay(seconds * 1000);
-            if (logService != null) logService.AddDeleteIgnore(msg.Id);
+            if (logService is not null) logService.AddDeleteIgnore(msg.Id);
 
             try { await msg.DeleteAsync(); }
             catch { }
@@ -206,7 +206,7 @@ public static class Extensions
 
     public static ModuleInfo GetTopLevelModule(this ModuleInfo module)
     {
-        while (module.Parent != null) module = module.Parent;
+        while (module.Parent is not null) module = module.Parent;
 
         return module;
     }
@@ -269,7 +269,7 @@ public static class Extensions
     }
 
     public static IEnumerable<IRole> GetRoles(this IGuildUser user)
-        => user.RoleIds.Select(r => user.Guild.GetRole(r)).Where(r => r != null);
+        => user.RoleIds.Select(r => user.Guild.GetRole(r)).Where(r => r is not null);
 
     public static bool IsImage(this HttpResponseMessage msg)
         => IsImage(msg, out _);

src/NadekoBot/_Extensions/IMessageChannelExtensions.cs

@@ -40,7 +40,7 @@ public static class MessageChannelExtensions
     {
         var embed = eb.Create().WithErrorColor().WithDescription(error).WithTitle(title);
 
-        if (url != null && Uri.IsWellFormedUriString(url, UriKind.Absolute))
+        if (url is not null && Uri.IsWellFormedUriString(url, UriKind.Absolute))
             embed.WithUrl(url);
 
         if (!string.IsNullOrWhiteSpace(footer))
@@ -65,7 +65,7 @@ public static class MessageChannelExtensions
     {
         var embed = eb.Create().WithOkColor().WithDescription(text).WithTitle(title);
 
-        if (url != null && Uri.IsWellFormedUriString(url, UriKind.Absolute))
+        if (url is not null && Uri.IsWellFormedUriString(url, UriKind.Absolute))
             embed.WithUrl(url);
 
         if (!string.IsNullOrWhiteSpace(footer))

src/NadekoBot/_Extensions/StringExtensions.cs

@@ -1,5 +1,6 @@
 using NadekoBot.Common.Yml;
 using Newtonsoft.Json;
+using System.Diagnostics.CodeAnalysis;
 using System.Text;
 using System.Text.RegularExpressions;