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[c#] Extensions

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What are extensions?

  • An extension method enables you to add methods to existing types without creating a new derived type, recompiling, or modify the original types. We can say that it extends the functionality of an existing type in .NET. An extension method is a static method to the existing static class. We call an extension method in the same general way; there is no difference in calling.


The following list contains basic features and properties of extension methods

  • It is a static method.
  • It must be located in a static class.
  • It uses the "this" keyword as the first parameter with a type in .NET and this method will be called by a given type instance on the client side.
  • It also shown by VS intellisense. When we press the dot (.) after a type instance, then it comes in VS intellisense.
  • An extension method should be in the same namespace as it is used or you need to import the namespace of the class by a using statement.
  • You can give any name for the class that has an extension method but the class should be static.
  • If you want to add new methods to a type and you don't have the source code for it, then the solution is to use and implement extension methods of that type.
  • If you create extension methods that have the same signature methods as the type you are extending, then the extension methods will never be called.

How do I create an extension in c#?

    public static class MyExtension


        public static void MyMethod(this <type> <name>, <extra objects>)






public static int CountVowels(this string str)


    char[] vowels = new char[] { 'a', 'e', 'i', 'o', 'u' };

    int vowelCount = 0;

    for (int i = 0; i < str.Length; i++)


        char current = str[i];

        if (vowels.Any(x => current == x))


            vowelCount = vowelCount + 1;


        return vowelCount;




int vowels = "some random string".CountVowels();


Example w/ additional input.

public static bool EqualsIgnoreCase(this string str, string equals)


    return str.ToLower() == equals.ToLower();



bool equals = "RANDOM STRING".EqualsIgnoreCase("RaNdOm StRiNg");


~the descriptions were not written by me but the code examples were.

Edited by privatebool

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