10 Bad Practices to Avoid in ASP.NET Core API Controllers

When developing controllers in ASP.NET Core, there are certain practices that should be avoided to ensure maintainability, performance, and adherence to best practices. Here are 10 things we should avoid in our controllers.

1. Tight coupling

Avoid tightly coupling in controllers with specific dependencies or frameworks. Instead, use dependency injection to inject dependencies into controllers. This promotes loose coupling and makes the code more testable and maintainable.

// Avoid:
[ApiController]
[Route("[controller]")]
public class ProductController : ControllerBase
{
    ProductService productService = …

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