What is dependency injection and how is it implemented in .NET Core?

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Dependency Injection (DI) is a design pattern that helps achieve loose coupling between classes and their dependencies. Instead of a class creating its own dependencies, they are provided (injected) from the outside, making the code more modular, testable, and maintainable.

How DI works:

• A class declares its dependencies via constructor parameters or properties.

• An external system (called the container or injector) creates and provides these dependencies.

• The class focuses on its core logic, not on managing dependencies.

DI in .NET Core:

.NET Core has built-in support for DI with a lightweight container.

1. Register Services:
   In Startup.cs inside the ConfigureServices method, you register dependencies using:

2. Inject Services:
   In classes like controllers or other services, request the dependencies via constructor:

3. Framework provides dependencies automatically when creating objects like controllers.

Summary:

• DI promotes loose coupling and testability.

• .NET Core’s built-in DI container manages object lifetimes and injections.

• You register services in Startup.cs and consume them via constructor injection.

This makes it easy to swap implementations, mock dependencies for testing, and follow SOLID principles.

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