C # Use of extension methods

Source: Internet
Author: User

For the specified type Extension Method:

Definition class Class1:


Public static class Class1 // must be a static class and cannot contain Constructors
/// <Summary>
/// Return the length of the array separated by "$" in the specified string
/// </Summary>
/// <Param name = "value"> string value </param>
/// <Returns> integer </returns>
Public static int ArrayListLenght (this string value)
Int len = 0;
If (value. IndexOf ("$")> = 0)
Len = value. Split ($). Length;

Return len;



Page call:


Protected void Page_Load (object sender, EventArgs e)
String sValue = "bbsdfdfd $ ssbbsdfdfd $ ss ";
Int count = sValue. ArrayListLenght ();

Response. Write ("value:" + count );


Output: Value: 3


The above only lists the "string" type extension methods. Similarly, You can provide other types of extension methods. Here, you can also use the data type as a generic processing method.

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