Implementing Clean Architecture in .NET Core

Clean Architecture is a software design philosophy that separates the elements of a design into ring levels. The main rule of Clean Architecture is that code dependencies can only point inward.

Core Principles

The architecture is divided into layers:

1. **Domain Layer** - Contains enterprise business rules and entities

2. **Application Layer** - Contains application business rules and use cases

3. **Infrastructure Layer** - Contains external concerns like databases and APIs

4. **Presentation Layer** - Contains UI and API controllers

Benefits

**Independence of Frameworks** - The architecture doesn't depend on the existence of some library

**Testability** - Business rules can be tested without the UI, database, or any external element

**Independence of UI** - The UI can change easily without changing the rest of the system

**Independence of Database** - You can swap out SQL Server for MongoDB, or any other database

Implementation in .NET Core

Here's a basic structure for a Clean Architecture project in .NET Core:

Solution/
├── Domain/
│   ├── Entities/
│   ├── Interfaces/
│   └── ValueObjects/
├── Application/
│   ├── UseCases/
│   ├── DTOs/
│   └── Interfaces/
├── Infrastructure/
│   ├── Persistence/
│   ├── Services/
│   └── Repositories/
└── WebAPI/
    ├── Controllers/
    └── Middleware/

This structure ensures that your business logic remains independent of external concerns, making your application more maintainable and testable.