Erweiterung des SingletonHostedService für Interface + Implementierung.

AMWD.Common.AspNetCore/Extensions/ServiceCollectionExtensions.cs

@@ -20,5 +20,21 @@ namespace Microsoft.Extensions.DependencyInjection
 			services.AddSingleton<IHostedService, BackgroundServiceStarter<TService>>();
 			return services;
 		}
+
+		/// <summary>
+		/// Adds a hosted service that is instanciated only once.
+		/// </summary>
+		/// <typeparam name="TService">The type of the service to add.</typeparam>
+		/// <typeparam name="TImplementation">The type of the implementation of the service to add.</typeparam>
+		/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
+		/// <returns>A reference to this instance after the operation has completed.</returns>
+		public static IServiceCollection AddSingletonHostedService<TService, TImplementation>(this IServiceCollection services)
+			where TService : class, IHostedService where TImplementation : class, TService
+		{
+			services.AddSingleton<TService, TImplementation>();
+			services.AddSingleton<IHostedService, BackgroundServiceStarter<TService>>();
+
+			return services;
+		}
 	}
 }