From f62adb6d725eade2b6fa47a081c2805c01bf14fe Mon Sep 17 00:00:00 2001
From: Andreas Mueller <webmaster@am-wd.de>
Date: Mon, 15 Nov 2021 00:02:43 +0100
Subject: [PATCH] =?UTF-8?q?Erweiterung=20des=20SingletonHostedService=20f?=
 =?UTF-8?q?=C3=BCr=20Interface=20+=20Implementierung.?=
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---
 .../Extensions/ServiceCollectionExtensions.cs    | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/AMWD.Common.AspNetCore/Extensions/ServiceCollectionExtensions.cs b/AMWD.Common.AspNetCore/Extensions/ServiceCollectionExtensions.cs
index 674b07e..5d24a0a 100644
--- a/AMWD.Common.AspNetCore/Extensions/ServiceCollectionExtensions.cs
+++ b/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;
+		}
 	}
 }