Make startup code compatible with .net core 3+

Author: Sergey Tregub

ProjectTemplates/ReferenceProject/Middleware/ExceptionMiddleware.cs

@@ -26,9 +26,9 @@ public class ExceptionMiddleware
 	{
 		RequestDelegate Next { get; }
 		ILogger Logger { get; }
-		IWebHostEnvironment Environment { get; }
+		IHostEnvironment Environment { get; }
 
-		public ExceptionMiddleware(RequestDelegate next, ILogger<ExceptionMiddleware> logger, IWebHostEnvironment environment)
+		public ExceptionMiddleware(RequestDelegate next, ILogger<ExceptionMiddleware> logger, IHostEnvironment environment)
 		{
 			Environment = environment ?? throw new ArgumentNullException(nameof(environment));
 			Logger = logger ?? throw new ArgumentNullException(nameof(logger));

ProjectTemplates/ReferenceProject/Program.cs

@@ -4,6 +4,7 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Configuration;
 using Serilog;
+using Microsoft.Extensions.Hosting;
 
 namespace ReferenceProject
 {
@@ -14,10 +15,9 @@ public static void Main(string[] args)
 			CreateHostBuilder(args).Build().Run();
 		}
 
-		// TODO: WebHost -> Host: https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.1&tabs=visual-studio#hostbuilder-replaces-webhostbuilder
-		public static IWebHostBuilder CreateHostBuilder(string[] args) =>
-			WebHost.CreateDefaultBuilder(args)
-				.ConfigureServices(services => services.AddAutofac())
+		public static IHostBuilder CreateHostBuilder(string[] args) =>
+			Host.CreateDefaultBuilder(args)
+				.UseServiceProviderFactory(new AutofacServiceProviderFactory())
 				.ConfigureLogging((context, logging) =>
 				{
 					logging.ClearProviders();
@@ -38,6 +38,9 @@ public static IWebHostBuilder CreateHostBuilder(string[] args) =>
 				{
 					x.AddEnvironmentVariables();
 				})
-				.UseStartup<Startup>();
+				.ConfigureWebHostDefaults(webBuilder =>
+				{
+					webBuilder.UseStartup<Startup>();
+				});
 	}
 }

ProjectTemplates/ReferenceProject/Startup.cs

@@ -28,11 +28,8 @@ namespace ReferenceProject
 {
     public class Startup
     {
-        ILogger<Startup> Logger { get; }
-
-        public Startup(IConfiguration configuration, IWebHostEnvironment env, ILogger<Startup> logger)
+        public Startup(IConfiguration configuration, IHostEnvironment env)
         {
-            Logger = logger;
             Startup.Configuration = configuration;
 
             // https://github.com/drwatson1/AspNet-Core-REST-Service/wiki#using-environment-variables-in-configuration-options
@@ -144,7 +141,7 @@ public void ConfigureProductionContainer(ContainerBuilder builder)
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app)
+        public void Configure(IApplicationBuilder app, ILogger<Startup> logger)
         {
             // Use an exception handler middleware before any other handlers
             // See: https://github.com/drwatson1/AspNet-Core-REST-Service/wiki#unhandled-exceptions-handling
@@ -168,7 +165,7 @@ public void Configure(IApplicationBuilder app)
 				endpoints.MapHealthChecks(Constants.Health.EndPoint); // TODO: Must be documented: https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/health-checks?view=aspnetcore-3.1
 			});
 
-			Logger.LogInformation("Server started");
+			logger.LogInformation("Server configuration is completed");
         }
     }
 }