RadioDJViewer/RadioDJViewer/EmbeddedResourceHelper.cs

using System;
using System.IO;
using System.Linq;
using System.Reflection;

namespace RadioDJViewer
{
    public static class EmbeddedResourceHelper
    {
        /// <summary>
        /// Reads an embedded resource's text content by matching the resource name ending with the provided file name.
        /// Example: call Read("index.html") to load a resource named "RadioDJViewer.Web.index.html" or similar.
        /// </summary>
        public static string Read(string fileName)
        {
            if (string.IsNullOrEmpty(fileName))
                throw new ArgumentNullException(nameof(fileName));

            var asm = Assembly.GetExecutingAssembly();
            var resourceName = asm.GetManifestResourceNames()
                                  .FirstOrDefault(n => n.EndsWith(fileName, StringComparison.OrdinalIgnoreCase));

            if (resourceName == null)
            {
                var names = string.Join(", ", asm.GetManifestResourceNames());
                throw new FileNotFoundException($"Embedded resource '{fileName}' not found. Available resources: {names}");
            }

            using (var stream = asm.GetManifestResourceStream(resourceName))
            {
                if (stream == null)
                    throw new FileNotFoundException($"Resource stream '{resourceName}' is null.");

                using (var reader = new StreamReader(stream))
                {
                    return reader.ReadToEnd();
                }
            }
        }
    }
}