ASP.NET Core.NETArchitectureBackendClean ArchitectureC#

Clean Architecture in ASP.NET Core: A Practical Guide

Implementing Clean Architecture in real-world .NET applications. Covers project structure, dependency rules, domain modeling, infrastructure, testing strategies, and common pitfalls.

Alex Chen
14 min read

Clean Architecture in ASP.NET Core: A Practical Guide

Clean Architecture isn't about folders—it's about dependency direction. Let's build it properly.

Project Structure

src/
├── Domain/           # Enterprise business rules
├── Application/      # Application business rules
├── Infrastructure/   # Frameworks, databases, external services
├── WebApi/           # Controllers, middleware, DI setup
└── Tests/
    ├── Unit/
    └── Integration/

Dependency Rule

Inner layers must not depend on outer layers.

Dependency Injection Setup

Testing Strategy

  • Unit tests — Domain logic, application handlers
  • Integration tests — Repository implementations, API endpoints
  • Contract tests — External service boundaries

Common Pitfalls

  1. Anemic Domain Model — Logic leaks to services
  2. Leaky Abstractions — Infrastructure types in Domain
  3. Over-Engineering — Not every CRUD app needs this

Conclusion

Clean Architecture pays off in maintainability and testability. Start with the dependency rule, organize by feature, and let the structure emerge from your domain.

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