The startup.cs class was purified by writing the extensions method in the field where services are registered in the startup.cs class.

src/Services/Identity/Identity.API/Extensions/StartupConfigurationExtensions.cs

@@ -0,0 +1,85 @@
+using IdentityServer4.Services;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.eShopOnContainers.Services.Identity.API;
+using Microsoft.eShopOnContainers.Services.Identity.API.Certificates;
+using Microsoft.eShopOnContainers.Services.Identity.API.Data;
+using Microsoft.eShopOnContainers.Services.Identity.API.Devspaces;
+using Microsoft.eShopOnContainers.Services.Identity.API.Models;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Reflection;
+using Microsoft.eShopOnContainers.Services.Identity.API.Services;
+
+namespace Identity.API.Extensions
+{
+    public static class StartupConfigurationExtensions
+    {
+        public static void RegisterAppInsights(this IServiceCollection services, IConfiguration configuration)
+        {
+            services.AddApplicationInsightsTelemetry(configuration);
+            services.AddApplicationInsightsKubernetesEnricher();
+        }
+        
+        // Add framework services.
+        public static void ConfigureDatabase(this IServiceCollection services, IConfiguration configuration)
+        {
+            services.AddDbContext<ApplicationDbContext>(options =>
+                   options.UseSqlServer(configuration["ConnectionString"],
+                   sqlServerOptionsAction: sqlOptions =>
+                   {
+                       sqlOptions.MigrationsAssembly(typeof(Startup).GetTypeInfo().Assembly.GetName().Name);
+                       //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
+                       sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
+                   }));
+
+            services.AddIdentity<ApplicationUser, IdentityRole>()
+                .AddEntityFrameworkStores<ApplicationDbContext>()
+                .AddDefaultTokenProviders();
+        }
+
+        // Adds IdentityServer
+        public static void ConfigureIdentityServer(this IServiceCollection services, IConfiguration configuration)
+        {
+            var connectionString = configuration["ConnectionString"];
+            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;
+
+            services.AddIdentityServer(x =>
+            {
+                x.IssuerUri = "null";
+                x.Authentication.CookieLifetime = TimeSpan.FromHours(2);
+            })
+            .AddDevspacesIfNeeded(configuration.GetValue("EnableDevspaces", false))
+            .AddSigningCredential(Certificate.Get())
+            .AddAspNetIdentity<ApplicationUser>()
+            .AddConfigurationStore(options =>
+            {
+                options.ConfigureDbContext = builder => builder.UseSqlServer(connectionString,
+                    sqlServerOptionsAction: sqlOptions =>
+                    {
+                        sqlOptions.MigrationsAssembly(migrationsAssembly);
+                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
+                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
+                    });
+            })
+            .AddOperationalStore(options =>
+            {
+                options.ConfigureDbContext = builder => builder.UseSqlServer(connectionString,
+                    sqlServerOptionsAction: sqlOptions =>
+                    {
+                        sqlOptions.MigrationsAssembly(migrationsAssembly);
+                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
+                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
+                    });
+            })
+            .Services.AddTransient<IProfileService, ProfileService>();
+        }
+
+        public static void ConfigureDependecyInjections(this IServiceCollection services)
+        {
+            services.AddTransient<ILoginService<ApplicationUser>, EFLoginService>();
+            services.AddTransient<IRedirectService, RedirectService>();
+        }
+    }
+}

src/Services/Identity/Identity.API/Startup.cs

@@ -1,18 +1,11 @@
 using Autofac;
 using Autofac.Extensions.DependencyInjection;
 using HealthChecks.UI.Client;
-using IdentityServer4.Services;
+using Identity.API.Extensions;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Diagnostics.HealthChecks;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.Identity;
-using Microsoft.EntityFrameworkCore;
-using Microsoft.eShopOnContainers.Services.Identity.API.Certificates;
-using Microsoft.eShopOnContainers.Services.Identity.API.Data;
-using Microsoft.eShopOnContainers.Services.Identity.API.Devspaces;
-using Microsoft.eShopOnContainers.Services.Identity.API.Models;
-using Microsoft.eShopOnContainers.Services.Identity.API.Services;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Diagnostics.HealthChecks;
@@ -20,37 +13,22 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using StackExchange.Redis;
 using System;
-using System.Reflection;
 
 namespace Microsoft.eShopOnContainers.Services.Identity.API
 {
     public class Startup
     {
-        public Startup(IConfiguration configuration)
-        {
-            Configuration = configuration;
-        }
+        public Startup(IConfiguration configuration) => (Configuration) = (configuration);
 
         public IConfiguration Configuration { get; }
 
         // This method gets called by the runtime. Use this method to add services to the container.
         public IServiceProvider ConfigureServices(IServiceCollection services)
         {
-            RegisterAppInsights(services);
+            services.RegisterAppInsights(Configuration);
 
             // Add framework services.
-            services.AddDbContext<ApplicationDbContext>(options =>
-                    options.UseSqlServer(Configuration["ConnectionString"],
-                    sqlServerOptionsAction: sqlOptions =>
-                    {
-                        sqlOptions.MigrationsAssembly(typeof(Startup).GetTypeInfo().Assembly.GetName().Name);
-                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
-                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
-                    }));
-
-            services.AddIdentity<ApplicationUser, IdentityRole>()
-                .AddEntityFrameworkStores<ApplicationDbContext>()
-                .AddDefaultTokenProviders();
+            services.ConfigureDatabase(Configuration);
 
             services.Configure<AppSettings>(Configuration);
 
@@ -69,42 +47,10 @@ namespace Microsoft.eShopOnContainers.Services.Identity.API
                     name: "IdentityDB-check",
                     tags: new string[] { "IdentityDB" });
 
-            services.AddTransient<ILoginService<ApplicationUser>, EFLoginService>();
-            services.AddTransient<IRedirectService, RedirectService>();
-
-            var connectionString = Configuration["ConnectionString"];
-            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;
+            services.ConfigureDependecyInjections();
 
             // Adds IdentityServer
-            services.AddIdentityServer(x =>
-            {
-                x.IssuerUri = "null";
-                x.Authentication.CookieLifetime = TimeSpan.FromHours(2);
-            })
-            .AddDevspacesIfNeeded(Configuration.GetValue("EnableDevspaces", false))
-            .AddSigningCredential(Certificate.Get())
-            .AddAspNetIdentity<ApplicationUser>()
-            .AddConfigurationStore(options =>
-            {
-                options.ConfigureDbContext = builder => builder.UseSqlServer(connectionString,
-                    sqlServerOptionsAction: sqlOptions =>
-                    {
-                        sqlOptions.MigrationsAssembly(migrationsAssembly);
-                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
-                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
-                    });
-            })
-            .AddOperationalStore(options =>
-            {
-                options.ConfigureDbContext = builder => builder.UseSqlServer(connectionString,
-                    sqlServerOptionsAction: sqlOptions =>
-                    {
-                        sqlOptions.MigrationsAssembly(migrationsAssembly);
-                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
-                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
-                    });
-            })
-            .Services.AddTransient<IProfileService, ProfileService>();
+            services.ConfigureIdentityServer(Configuration);
 
             //services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
             services.AddControllers();
@@ -174,11 +120,5 @@ namespace Microsoft.eShopOnContainers.Services.Identity.API
                 });
             });
         }
-
-        private void RegisterAppInsights(IServiceCollection services)
-        {
-            services.AddApplicationInsightsTelemetry(Configuration);
-            services.AddApplicationInsightsKubernetesEnricher();
-        }
     }
 }