In Multiple inheritance, one class can have more than one superclass and inherit features from all its parent classes. As shown in the below diagram, class C inherits the features of class A and B.
But C# does not support multiple class inheritance. To overcome this problem we use interfaces to achieve multiple class inheritance. With the help of the interface, class C( as shown in the above diagram) can get the features of class A and B.
Example 1: First of all, we try to inherit the features of Geeks1 and Geeks2 class into GeeksforGeeks class, then the compiler will give an error because C# directly does not support multiple class inheritance.
prog.cs(61, 30): error CS1721: `GeeksforGeeks’: Classes cannot have multiple base classes (`Geeks1′ and `Geeks2′)
prog.cs(35, 7): (Location of the symbol related to previous error)
But we can indirectly inherit the features of Geeks1 and Geek2 class into GeeksforGeeks class using interfaces. As shown in the below diagram.
Example 2: Both GFG1 and GFG2 interfaces are implemented by Geeks1 and Geeks2 class. Now Geeks1 and Geeks2 class define languages() and courses() method. When a GeeksforGeeks class inherits GFG1 and GFG2 interfaces you need not to redefine languages() and courses() method just simply create the objects of Geeks1 and Geeks2 class and access the languages() and courses() method using these objects in GeeksforGeeks class.
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