Polymorphism in C# with exmple

Polymorphism means many forms (ability to take more than one form). In Polymorphism poly means “multiple” and morph means “forms” so polymorphism means many forms.

In Polymorphism we have 2 different types those are

        -   Compile Time Polymorphism (Called as Early Binding or Overloading or static binding)

        -   Run Time Polymorphism (Called as Late Binding or Overriding or dynamic binding)

Compile Time Polymorphism

Compile time polymorphism means we will declare methods with same name but different signatures because of this we will perform different tasks with same method name. This compile time polymorphism also called as early binding or method overloading.

Method Overloading or compile time polymorphism means same method names with different signatures (different parameters)

Example

  

public class Class1

{

public void NumbersAdd(int a, int b)

{

Console.WriteLine(a + b);

}

public void NumbersAdd(int a, int b, int c)

{

Console.WriteLine(a + b + c);

}

}

Run Time Polymorphism

Run time polymorphism also called as late binding or method overriding or dynamic polymorphism. Run time polymorphism or method overriding means same method names with same signatures.

In this run time polymorphism or method overriding we can override a method in base class by creating similar function in derived class this can be achieved by using inheritance principle and using “virtual & override” keywords.

In base class if we declare methods with virtual keyword then only we can override those methods in derived class using override keyword

Example

//Base Class

public class Parent

{

public virtual void Sample1()

{

Console.WriteLine("Base Class");

}

}

// Derived Class

public class Child : Parent

{

public override void Sample1()

{

Console.WriteLine("Derived Class");

}

}

// Using base and derived class

class Program

{

static void Main(string[] args)

{

// calling the overriden method

Child c= new Child();

c.Sample1();

// calling the base class method

Parent p= new Child();

p.Sample1();

}

}