csharp-patterns

ASP.NET Core Web API structuring uses dependency injection for service lifetimes and middleware for request pipeline configuration. This approach creates a maintainable application foundation by properly separating cross-cutting concerns and core business logic.

Implementing validation and DTOs in an ASP.NET Core backend is best achieved using Data Transfer Objects to isolate API contracts and FluentValidation to enforce data integrity rules. This pattern prevents invalid data from reaching your core domain logic.

The minimal API approach in ASP.NET Core offers a lightweight alternative to traditional controllers, reducing boilerplate for simple endpoints. Controllers remain preferable for complex architectures requiring structured action filters and extensive dependency injection.

You can use the repository pattern with EF Core in C# to abstract data access operations. This implementation centralizes query logic, facilitates testability through mockable interfaces, and maintains clean separation between domain layers and database contexts.

Implement caching using IMemoryCache or Output Caching when reducing latency for frequent read operations, and deploy background services for asynchronous tasks. These ASP.NET Core capabilities optimize performance and prevent long-running operations from blocking API requests.