Use .Distinct on assembly

Emby.Server.Implementations/ApplicationHost.cs

@@ -1387,15 +1387,17 @@ namespace Emby.Server.Implementations
 
         public IEnumerable<Assembly> GetApiPluginAssemblies()
         {
-            var types = _allConcreteTypes
+            var assemblies = _allConcreteTypes
                 .Where(i => typeof(ControllerBase).IsAssignableFrom(i))
+                .Select(i => i.Assembly)
                 .Distinct();
 
-            foreach (var type in types)
+            foreach (var assembly in assemblies)
             {
-                Logger.LogDebug("Found API endpoints in plugin {name}", type.Assembly.FullName);
-                yield return type.Assembly;
+                Logger.LogDebug("Found API endpoints in plugin {name}", assembly.FullName);
             }
+
+            return assemblies;
         }
 
         public virtual void LaunchUrl(string url)

Jellyfin.Server/Extensions/ApiServiceCollectionExtensions.cs

@@ -136,9 +136,9 @@ namespace Jellyfin.Server.Extensions
         /// </summary>
         /// <param name="serviceCollection">The service collection.</param>
         /// <param name="baseUrl">The base url for the API.</param>
-        /// <param name="applicationHost">The application host.</param>
+        /// <param name="pluginAssemblies">An IEnumberable containing all plugin assemblies with API controllers.</param>
         /// <returns>The MVC builder.</returns>
-        public static IMvcBuilder AddJellyfinApi(this IServiceCollection serviceCollection, string baseUrl, IApplicationHost applicationHost)
+        public static IMvcBuilder AddJellyfinApi(this IServiceCollection serviceCollection, string baseUrl, IEnumerable<Assembly> pluginAssemblies)
         {
             IMvcBuilder mvcBuilder = serviceCollection
                 .AddCors(options =>
@@ -179,7 +179,7 @@ namespace Jellyfin.Server.Extensions
                     options.JsonSerializerOptions.PropertyNamingPolicy = jsonOptions.PropertyNamingPolicy;
                 });
 
-            foreach (Assembly pluginAssembly in applicationHost.GetApiPluginAssemblies())
+            foreach (Assembly pluginAssembly in pluginAssemblies)
             {
                 mvcBuilder.AddApplicationPart(pluginAssembly);
             }

Jellyfin.Server/Startup.cs

@@ -41,7 +41,7 @@ namespace Jellyfin.Server
         {
             services.AddResponseCompression();
             services.AddHttpContextAccessor();
-            services.AddJellyfinApi(_serverConfigurationManager.Configuration.BaseUrl.TrimStart('/'), _applicationHost);
+            services.AddJellyfinApi(_serverConfigurationManager.Configuration.BaseUrl.TrimStart('/'), _applicationHost.GetApiPluginAssemblies());
 
             services.AddJellyfinApiSwagger();