What is the difference between abstract class and interface in .NET?

• Abstract class can have both abstract methods as well as concrete methods. But all interface methods are abstract in nature; they will not have any implementation.



• Abstract classes are meant to be inherited but interface doesn’t involve in inheritance. Interfaces can only be implemented and not inherited.
• A class can inherit from only one abstract class but a class can implement multiple interfaces.
• A class inheriting from an abstract class should override all abstract methods. However it is optional to override the concrete methods. But a class implementing an interface should implement all the interface methods.

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