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1. C# 5.0 Pocket Reference > Extension Methods

Extension Methods

Extension methods allow an existing type to be extended with new methods, without altering the definition of the original type. An extension method is a static method of a static class, where the this modifier is applied to the first parameter. The type of the first parameter will be the type that is extended. For example:

public static class StringHelper
{
  public static bool IsCapitalized (this string s)
  {
    if (string.IsNullOrEmpty (s)) return false;
    return char.IsUpper (s[0]);
  }
}

The IsCapitalized extension method can be called as though it were an instance method on a string, as follows:

Console.Write ("Perth".IsCapitalized());

An extension method call, when compiled, is translated back into an ordinary static method call:


  

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