How to Create Extension Method in C# ?

Published on December 25, 2013 by abundantcode

Filed under C#

Last modified December 25, 2013

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Extension methods are great way to add a method to an existing type . A typical scenario is when you dont have the access to the sourcecode and want to add a method to the type .

How to Create Extension Method in C# ?

Below is a sample code snippet that demonstrates how to create an extension method for the integer type to tell if the number is Odd or not.

using System;
namespace AbundantCode
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            int Input = 5;
            var returnValue = Input.IsOdd();
            Console.WriteLine(returnValue);
            Console.ReadLine();
        }
    }
    public static class Helper
    {
        public static bool IsOdd(this int value)
        {
            return !(value % 2 == 0);
        }
    }
}

How to Create Extension Method in C# ?

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