Abstract Class vs Interface in C#: Key Differences and When to Use Each

Abstract Class vs Interface in C# When designing class hierarchies in C#, you’ll often face a choice between using interfaces or abstract classes. Both serve as blueprints for other classes, but they have fundamental differences that affect how you design your application. Let me walk you through their key differences with practical examples, so you can make informed decisions in your code architecture. Implementation Capabilities Abstract Classes Abstract classes can contain a mix of implemented methods (with concrete code) and abstract methods (without implementation): ...

June 20, 2025 · 4 min · 756 words