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  • Extension methods in c#

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    Extension methods are the static methods which are defined under the static classes. Since these methods are defined in static class then they are called without creating an instance of a class. Extension methods supports a reusability as they enable us to modify the existing type without creating a new derived type. When we are modifying an existing extension method  then we don't need to re-compile it.

     

    Features of Extension methods:
    1. It must declare as a static method.
    2. It must defined under the static class.
    3. It must that it uses a "this" keyword in its first parameter.
    4. After creating an extension method it must shown by the visual studio intellisense, When user press the dot after a type instance.
    5. If we want to use a extension method then we need to import the namespace( where the extension method is defined ) in your source code.

     

    See the below example
     

    using System;
    namespace ExtensionMethodAppliction
    {
    public static class ExtensionMethods
    {
        public static bool IsPalindrome(this String str)
        {
            for (int i = 0; i < str.Length / 2; i++)
                if (str[i] != str[str.Length - i - 1])
                 {
                    return false;
                  }
           return true;
          }
         }
    } 
    

     

    using System;
    namespace ExtensionMethodAppliction
    {
        class ExtentionMethodProgram
        {
            static void Main(string[] args)
            {
               string str = string.Empty;
                Console.WriteLine("Enter the string to which you want to check :");
                  str = Console.ReadLine();
               if(str.IsPalindrome())
                  {
                        Console.WriteLine("Entered string is palindrome ");
                    }
           else
                 {
                         Console.WriteLine("Entered string is not palindrome");
                   }
                Console.ReadKey();
            }
        }
    } 
    

     

    In the above example we make a extension method IsPalindrome inside the static class. In this method we are passing a string type parameter so that it will called by the string type variable. This method return true if the given string is palindrome and false if not.
    After creating a extension method we create a main method where we take string from the user and uses a extension method to check whether the string entered by the user is palindrome or not.
    If the extension method returns true then user get the following message:
                   "Entered string is palindrome"
     If the extension method returns false then user get the following message:
                   "Entered string is not palindrome"

     

     

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