Best-Practices

TL;DR DIP means depend on abstractions, not concrete implementations. Use interfaces and dependency injection to decouple business logic from details. DIP improves testability, flexibility, and maintainability in C# code. Avoid leaky abstractions, unnecessary interfaces, and service locator anti-patterns. Use C# 12 primary constructors and .NET 8 DI features for clean, modern architecture. The Dependency Inversion Principle helps you turn rigid, tightly-coupled code into flexible, testable systems. Rather than depending on concrete implementations, your high-level modules rely on abstractions. This goes beyond dependency injection, it’s about changing the direction of control flow. ...

Discover how the Dependency Inversion Principle makes your C# code flexible and testable. Learn to use ASP.NET Core DI to depend on abstractions, swap implementations, and build maintainable, scalable applications with real-world examples.

Discover why structs as dictionary keys can cause hidden allocations in C#. Learn how to implement IEquatable, use readonly and record structs, and write allocation-free, high-performance code for hot paths.

Discover how guard clauses in C# simplify validation and error handling. Learn to write fail-fast code, avoid nested conditionals, and keep business logic clean with modern language features and reusable helpers.

TL;DR Middleware order in ASP.NET Core directly affects authentication, CORS, routing, and logging. Register exception handling, HTTPS redirection, and logging middleware early in the pipeline. Place CORS before authentication and routing to avoid preflight and header issues. Authentication must come before authorization and routing for secure endpoints. Use tools like MiddlewareAnalysis and custom logging middleware to debug pipeline flow. Common mistakes include routing before authentication, CORS after auth, and late exception handling. Correct middleware order prevents security holes, debugging nightmares, and production outages. The Hidden Culprit Behind Mysterious Pipeline Failures Picture this: your ASP.NET Core API works perfectly in development, but authentication randomly fails in production. CORS headers appear inconsistently. Some endpoints return 404s that should work. The logs show everything should be working correctly. ...

Discover the optimal middleware order for ASP.NET Core. See why each step matters, how to avoid common pitfalls, and use a proven pipeline template for secure, fast, and maintainable web APIs.

TL;DR - Practical Tips for ASP.NET Core HTTP Logging Middleware Use EnableBuffering() to safely log request bodies and reset stream position after reading. Capture response bodies by swapping HttpResponse.Body with a MemoryStream and restoring after logging. Always filter or redact sensitive data before logging HTTP bodies. Set size limits and skip large or binary payloads to avoid performance issues. Filter logs by endpoint, HTTP method, or custom attributes for clarity. Built-in HttpLogging is simple; custom middleware offers full control and advanced filtering. Use structured logging and external services for production monitoring. Wrap middleware in extension methods for clean, configurable registration. Leverage PipeReader and System.IO.Pipelines for more efficient memory usage. Use Span<T> and ArrayPool<T> for zero-allocation processing of large payloads. Consider implementing request sampling in production to reduce log volume. Use a complete middleware implementation that combines all best practices. 1. How does EnableBuffering help you log request bodies in ASP.NET Core? EnableBuffering allows you to read request bodies multiple times without breaking the pipeline. ...

Protect your ASP.NET Core APIs from abuse with custom request throttling middleware using IMemoryCache and per-IP limits. Learn to implement, configure, and monitor rate limiting for robust, high-performance APIs.

Quick Reference Table Feature Abstract Class Interface When to Use Inheritance Single only Multiple allowed Abstract: shared logic; Interface: contracts Implementation Can provide Contract only Abstract: code reuse; Interface: flexibility Constructors Supported Not allowed Abstract: initialization; Interface: pure contracts State/Fields Yes No Abstract: data sharing; Interface: behavior only Performance Slightly faster Virtual dispatch Abstract: hot paths; Interface: most scenarios Testing Can be difficult Easy with mocks Abstract: integration tests; Interface: unit tests Common Pitfalls: ...

Master local HTTPS in .NET with dotnet dev-certs https. Learn how to create, trust, and troubleshoot development certificates, avoid common pitfalls, and follow best practices for secure, productive local development.