Optional (or Default) Parameters in C# 4.0

 

This feature of C# has been obtained from VB.NET. In new C# 4.0 there is an option to pass all the parameters as optional and no need to unnecessarily overload the methods. This is really a great feature to be implemented in all the programming languages.

Hands on:

Prior to that we have to include the using of

using System.Runtime.InteropServices

And our functionality as follows

public void MainMethod()

   {

       int parameter1 = 1;

       int parameter2 = 2;

       MethodCall1(parameter1);

       MethodCall2(parameter1,parameter2);     // This method will call MethodCall2 as usual

       MethodCall2(parameter1);                // This method will call MethodCall2 with only 1 parameter and the other is Optional

   }

   public void MethodCall1(int x)

   {

       // this is an example of ordinary method execution

       Console.WriteLine("MethodCall1 is executed");

   }

   public void MethodCall2(int x, [Optional] int y)

   {

       // This method will be called with 1 parameter and also with 2 parameters

       Console.WriteLine("MethodCall2 is executed");

   }

-Yuva

http://Yuvahere.com