C # Extension Methods extension method

The new features introduced in C #. NET Framewoke 3.0 provide extensions. NET class method , can increase the aesthetics of the Code!

There are several requirements for writing an extension method:

The class in which the extension method resides must be global, not an inner nested class, and the class of the extension method must be a static class .

The extension method must be a static method .

The data type of the first parameter of the extension method must be the type to be extended and the This keyword is used.

Extension method Definition:

public static class cexlongmethed{    //No parameter no return value public    static void Print (this long L)    {        Console.WriteLine ( l);    }    The parameter has a return value    of public static long Add (this long l, long L2)    {        return (L + L2);}    }

Call:

Long lval = 1;lval.print (); Console.WriteLine (Lval.add (2));

C # Extension Methods extension method