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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. ...

This guide covers how to effectively test ASP.NET Core middleware using unit tests, integration tests, and mocks. It includes examples of common middleware patterns, how to handle dependencies, and best practices for ensuring your middleware behaves correctly in production.

TL;DR ISP means interfaces should be small and focused on client needs. Avoid “God” interfaces that force clients to implement unused methods. Split large interfaces into cohesive, role-based interfaces. Use C# 12 features like default interface methods for flexibility. ISP improves maintainability, testability, and reduces coupling. Refactor fat interfaces by extracting related methods into separate interfaces. Interface Segregation Principle stops you from creating huge interfaces that force clients to implement methods they’ll never use. When interfaces get too big, your implementations end up filled with empty methods and unnecessary dependencies. ...

A comprehensive guide to diagnosing and fixing common EF Core performance issues, with practical code examples and real-world performance improvements.

Learn why experienced C# developers choose interfaces over abstract classes 95% of the time. Real-world examples, team benefits, and clean architecture tips.

Master IEquatable in C# to optimize equality checks, improve collection performance, and eliminate boxing overhead. Essential for value types and collections.

Polymorphism isn’t just a language feature, it’s a way to build systems that are easier to extend, change, and maintain. Learn how polymorphism powers design patterns like Template Method, Strategy, and Visitor in C#.

A practical guide to C# Default Interface Methods: how to use them, when to avoid them, and how they help you build future-proof APIs.

TL;DR LSP means you can use subtype objects anywhere you use base type objects without breaking code. Square/Rectangle inheritance that breaks existing code? That’s a classic LSP problem. Watch for subclasses that throw unexpected exceptions or silently change behavior. When behaviors are too different, reach for composition instead of inheritance. Make interfaces that clearly show what objects can and can’t do to avoid surprises. LSP violations often sneak past unit tests and show up as runtime bugs. The Liskov Substitution Principle isn’t just academic theory - it helps you avoid those “it worked yesterday” bugs that show up in production. When a subclass doesn’t behave like its parent promises, your code breaks in ways that unit tests often miss. ...

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.