dotnet-clean-architecture

Clean Architecture in .NET uses a four-layer structure—Domain, Application, Infrastructure, and API—with dependencies pointing strictly inward. The Domain layer requires zero external dependencies to ensure decoupled, testable business logic.

To add a new feature using CQRS and MediatR, you create a Command and its corresponding Handler under the Application layer. This pattern separates read and write operations, reducing coupling and improving scalability across your .NET solution.

Correct dependency injection in a Clean Architecture .NET app requires registering MediatR handlers and infrastructure services at the API or Infrastructure layer. This setup ensures the Application and Domain layers remain decoupled from external concerns.

Yes, you can refactor an existing ASP.NET Core solution by reorganizing code into Domain, Application, Infrastructure, and API boundaries. This process involves moving business logic inward and configuring proper dependency injection to satisfy architecture guidelines.

No, the Domain layer in Clean Architecture requires zero external dependencies. MediatR command and query handlers belong in the Application layer, ensuring the core business logic remains isolated and fully testable.