IMvcCoreBuilder

IMvcCoreBuilder is an interface defined within the Microsoft.AspNetCore.Mvc.Core package in ASP.NET Core. It represents a builder for configuring the core MVC services in an ASP.NET Core application. This interface plays a crucial role in the dependency injection and service configuration process for Model-View-Controller (MVC) applications built on ASP.NET Core.

When you use the `AddMvcCore()` extension method on an `IMvcBuilder` or directly on an `IServiceCollection`, it returns an `IMvcCoreBuilder`. This returned builder allows you to further customize the MVC setup. Common configurations accessible through `IMvcCoreBuilder` include adding controllers, views, Razor pages, and specific MVC features like model binding, authorization, and formatters.

The purpose of `IMvcCoreBuilder` is to provide a fluent and organized way to register and configure the essential components that make up the MVC framework. Developers can chain calls to its methods to selectively enable or disable features, add custom implementations, and fine-tune how the MVC pipeline behaves. This granular control is essential for building flexible and performant web applications. Ultimately, `IMvcCoreBuilder` is a key component in the ASP.NET Core MVC extensibility model.