dotnet clean architecture architecture beginners dotnet 101

Clean Architecture in C#

Build maintainable, testable .NET apps

Posted by Rodrigo Castro on February 23, 2025

Clean Architecture organizes your code into layers for long-term maintainability.

🏗️ Layers

  • Domain: Business logic (core)
  • Application: Use cases and business rules
  • Infrastructure: Database, external services
  • UI: Web, API, or GUI

🧭 Basic Project Structure

1
2
3
4

/Domain
/Application
/Infrastructure
/Web (or /Api)
  • The Domain layer has no dependencies on other project layers.
  • The Application layer depends only on Domain.

🔄 Dependency Rule

  • Dependencies point inward (UI → Infrastructure → Application → Domain)
  • Business rules are at the center and are independent.

🧪 Benefits

  • Easier to test
  • Adaptable to change
  • Clear separation of concerns

💡 Start Simple

  • Move common logic to the Domain layer
  • Use interfaces to decouple implementations

Congratulations! You’ve reached the end of the advanced .NET 101 topics.

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