Refactoring

AMWD.Common.AspNetCore/Extensions/ServiceCollectionExtensions.cs

@@ -0,0 +1,24 @@
+using Microsoft.Extensions.Hosting;
+
+namespace Microsoft.Extensions.DependencyInjection
+{
+	/// <summary>
+	/// Extensions for the <see cref="IServiceCollection"/>.
+	/// </summary>
+	public static class ServiceCollectionExtensions
+	{
+		/// <summary>
+		/// Adds a hosted service that is instanciated only once.
+		/// </summary>
+		/// <typeparam name="TService">The type 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>(this IServiceCollection services)
+			where TService : class, IHostedService
+		{
+			services.AddSingleton<TService>();
+			services.AddSingleton<IHostedService, BackgroundServiceStarter<TService>>();
+			return services;
+		}
+	}
+}