Here is the answer of the question: In which of these situations are interfaces better than abstract classes?
- When you need to define an object type’s characteristics, use an interface. When you need to define an object type’s capabilities, use an abstract class.
- Interfaces are a legacy of older versions of C#, and are interchangeable with the newer abstract class feature.
- When you need a list of capabilities and data that are classes-agnostic, use an interface. When you need a certain object type to share characteristics, use an abstract class.
- You should use both an interface and an abstract class when defining any complex object.
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