Polymorphism in C#

Polymorphism in C#

Polymorphism means the same operation may behave differently on different classes.
Example of Compile Time Polymorphism: Method Overloading

Example of Run Time Polymorphism: Method Overriding

Example of Compile Time Polymorphism

Method Overloading: Method with same name but with different arguments is called method overloading.

Method Overloading forms compile-time polymorphism.
Example of Method Overloading
class A1  
{ 
    void hello() 
    { 
        Console.WriteLine("Hello"); 
    } 
    void hello(string s)  
    { 
        Console.WriteLine("Hello {0}", s); 
    } 
} 
Example of Run Time Polymorphism
Method Overriding: Method overriding occurs when child class declares a method that has the same type arguments as a method declared by one of its superclass.

Method overriding forms Run-time polymorphism.

Note

By default functions are not virtual in C# and so you need to write “virtual” explicitly. While by default in Java each function are virtual.

Example of Method Overriding
Class parent  
{ 
    virtual void hello() 
    { 
        Console.WriteLine("A D Patel"); 
    } 
} 
Class child: parent  
{ 
    override void hello()  
    { 
        Console.WriteLine("R A Patel"); 
    } 
} 
static void main()  
    { 
        parent objParent = new child(); 
        objParent.hello(); 
    } 

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