added configuration

Author: enzian

.vscode/launch.json

@@ -11,7 +11,7 @@
             "preLaunchTask": "build",
             // If you have changed target frameworks, make sure to update the program path.
             "program": "${workspaceFolder}/src/StronglyTyped.SampleService/bin/Debug/netcoreapp2.2/StronglyTyped.SampleService.dll",
-            "args": [],
+            "args": ["/MySetting:SomeValue=123"],
             "cwd": "${workspaceFolder}/src/StronglyTyped.SampleService",
             "stopAtEntry": false,
             "launchBrowser": {

src/StronglyTyped.SampleService/Program.cs

@@ -19,6 +19,7 @@ public static void Main(string[] args)
 
         public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
             WebHost.CreateDefaultBuilder(args)
-                .UseStartup<Startup>();
+                .UseStartup<Startup>()
+                .ConfigureAppConfiguration(x => { x.AddCommandLine(args); });
     }
 }

src/StronglyTyped.SampleService/Startup.cs

@@ -15,9 +15,14 @@ namespace StronglyTyped.SampleService
 {
     public class Startup
     {
-        public Startup(IConfiguration configuration)
+        public Startup(IConfiguration configuration, IHostingEnvironment environment)
         {
-            Configuration = configuration;
+            Configuration = new ConfigurationBuilder()
+                .AddJsonFile("appsettings.json")
+                .AddJsonFile($"appsettings.{environment.EnvironmentName}", optional: true)
+                .AddEnvironmentVariables()
+                .AddConfiguration(configuration)
+                .Build();
         }
 
         public IConfiguration Configuration { get; }