AspNetCore.Docs/aspnetcore/includes/combine-di.md

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Consider the following ConfigureServices method, which registers services and configures options:

[!code-csharp]

Related groups of registrations can be moved to an extension method to register services. For example, the configuration services are added to the following class:

[!code-csharp]

The remaining services are registered in a similar class. The following ConfigureServices method uses the new extension methods to register the services:

[!code-csharp]

Note: Each services.Add{GROUP_NAME} extension method adds and potentially configures services. For example, xref:Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddControllersWithViews%2A adds the services MVC controllers with views require, and xref:Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddRazorPages%2A adds the services Razor Pages requires. We recommended that apps follow the naming convention of creating extension methods in the xref:Microsoft.Extensions.DependencyInjection?displayProperty=fullName namespace. Creating extension methods in the Microsoft.Extensions.DependencyInjection namespace:

• Encapsulates groups of service registrations.
• Provides convenient IntelliSense access to the service.