C# Beginner to advanced - Lesson 28 - Abstract Classes part 1

Abstract class:

The abstract keyword is used to create abstract classes.

Abstract class cannot be instantiated because it is incomplete.

Abstract class can only be used as base class.

Abstract class cannot be sealed.

An abstract class may contain abstract members like methods , properties, indexers and events, but it’s not mandatory to have members.

A non-abstract class derived from an abstract class must provide implementations for all inherited abstract members.

Abstract class inheritance :

If a class inheriting abstract class then, there are two options available for that class:

Provide implementation for all the abstract members inherited from the base abstract class

If the class does not wish to provide implementation for all the abstract members inherited from the abstract class, then the class has to be marked as abstract.

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