C# Polymorphism - c# - c# tutorial - c# net



What is polymorphism in C# ?

  • The term "Polymorphism" is the combination of "poly" + "morphs" which means many forms.
  • learn c# tutorials - polymorphism in c#

    learn c# tutorial - polymorphism in c# Example

  • It is a greek word. In object-oriented programming, we use 3 main concepts:
    • inheritance,
    • encapsulation and
    • polymorphism.
  • There are two types of polymorphism in C#:
    • compile time polymorphism and
    • runtime polymorphism.
  • Compile time polymorphism is achieved by method overloading and operator overloading in C#.
  • It is also known as static binding or early binding. Runtime polymorphism in achieved by method overriding which is also known as dynamic binding or late binding.
Polymorphism

Polymorphism

C# Runtime Polymorphism Example

  • Let's see a simple example of runtime polymorphism in C#.
using System;  
public class Animal{  
public virtual void eat(){  
Console.WriteLine("eating...");  
}  
}  
public class Dog: Animal  
{  
public override void eat()  
{  
Console.WriteLine("eating bread...");  
}  

}  
public class TestPolymorphism  
{  
public static void Main()  
{  
Animal a= new Dog();  
a.eat();  
}  
}  
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C# examples - Output :

eating bread...

C# Runtime Polymorphism Example 2

  • Let's see a another example of runtime polymorphism in C# where we are having two derived classes.
using System;  
public class Shape{  
public virtual void draw(){  
Console.WriteLine("drawing...");  
}  
}  
public class Rectangle: Shape  
{  
public override void draw()  
{  
Console.WriteLine("drawing rectangle...");  
}  

}  
public class Circle : Shape  
{  
public override void draw()  
{  
Console.WriteLine("drawing circle...");  
}  

}  
public class TestPolymorphism  
{  
public static void Main()  
{  
Shape s;  
s = new Shape();  
s.draw();  
s = new Rectangle();  
s.draw();  
s = new Circle();  
s.draw();  

}  
}  
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C# examples - Output :

drawing...
drawing rectangle...
drawing circle...
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Runtime Polymorphism with Data Members

  • Runtime Polymorphism can't be achieved by data members in C#. Let's see an example where we are accessing the field by reference variable which refers to the instance of derived class.
using System;  
public class Animal{  
public string color = "white";  

}  
public class Dog: Animal  
{  
public string color = "black";  
}  
public class TestSealed  
{  
public static void Main()  
{  
Animal d = new Dog();  
Console.WriteLine(d.color);  

}  
}  
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C# examples - Output :

white


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