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Programming - C# Extension Methods

Extension methods are a new feature added to the C# specifiation. They allow you to dynamically add methods to classes from the context of your own application. It is especially usefull for code re-usability and keeps messy static and instance oriented functions to their variable scope.

An example would be to add a regular expresion extension directly to the string class.

You could do this within an extension implementation in the following way:

static class Program

{

static void Main(string[] args)

{

string s = "Hello, world";

s.Strip(@"<(.|\n)*?>");

}

/// <summary>

/// Strips text according to the regular expression passed in

/// </summary>

/// <param name="s"></param>

/// <param name="expresssion"></param>

/// <returns></returns>

static string Strip(this string s, string expresssion)

{

Regex.Replace(s, expresssion, string.Empty);

}

}

As you can see, we have added an extension method, which is a string utility dirctly to the class instance. Because it is defined in the scope of our application it is only available to ourselves.

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