How does Dependency Injection work in .NET core, and why is it important?

Question

Accepted Answer

Dependency Injection in .NET Core promotes loose coupling and enhances testability by managing object lifetimes and dependencies.

Inversion of Control: DI allows the framework to manage the creation and lifetime of objects, reducing the need for manual instantiation.
Service Registration: Services are registered in the Startup class using methods like AddSingleton, AddScoped, or AddTransient, defining their lifetimes.
Constructor Injection: Dependencies are typically provided through constructor parameters, making it clear what a class requires to function.
Improved Testability: By injecting dependencies, classes can be easily tested with mock objects, facilitating unit testing.
Example: A service class can be injected into a controller, allowing the controller to focus on handling requests without worrying about service instantiation.

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