dotnet-backend-patterns

# .NET Backend Development Patterns Master C#/.NET patterns for building production-grade APIs, MCP servers, and enterprise backends with modern best practices (2024/2025). ## When to Use This Skill - Developing new .NET Web APIs or MCP servers - Reviewing C# code for quality and performance - Designing service architectures with dependency injection - Implementing caching strategies with Redis - Writing unit and integration tests - Optimizing database access with EF Core or Dapper - Configuring applications with IOptions pattern - Handling errors and implementing resilience patterns ## Core Concepts ### 1. Project Structure (Clean Architecture) ``` src/ ├── Domain/ # Core business logic (no dependencies) │ ├── Entities/ │ ├── Interfaces/ │ ├── Exceptions/ │ └── ValueObjects/ ├── Application/ # Use cases, DTOs, validation │ ├── Services/ │ ├── DTOs/ │ ├── Validators/ │ └── Interfaces/ ├── Infrastructure/ # External implementations │ ├── Data/ # EF Core, Dapper repositories │ ├── Caching/ # Redis, Memory cache │ ├── External/ # HTTP clients, third-party APIs │ └── DependencyInjection/ # Service registration └── Api/ # Entry point ├── Controllers/ # Or MinimalAPI endpoints ├── Middleware/ ├── Filters/ └── Program.cs ``` ### 2. Dependency Injection Patterns ```csharp // Service registration by lifetime ...