How is dependency injection implemented in ASP.NET Core?

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In ASP.NET Core, Dependency Injection (DI) is a built-in, first-class feature used to achieve loose coupling and easier testing by injecting dependencies rather than hardcoding them.

How DI is implemented:

1. Service Registration:
   In the Startup.cs file (or Program.cs in minimal hosting), you register services in the IServiceCollection via the ConfigureServices method:You register interfaces with their concrete implementations and specify lifetimes.

2. Constructor Injection:
   ASP.NET Core uses constructor injection by default. Dependencies are requested via constructor parameters.The framework automatically resolves and injects the registered service when creating the controller.

3. Service Provider:
   Internally, ASP.NET Core builds a service provider (DI container) that manages object lifetimes and resolves dependencies at runtime.

4. Using DI in Middleware and Other Components:
   You can inject services into middleware, Razor pages, or other classes by constructor injection or method injection.

Summary:
ASP.NET Core implements DI by registering services and their lifetimes in a centralized container, then injecting these dependencies automatically into classes via constructors, enabling modular, testable, and maintainable code.

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