---method of class extension:

1 extension methods for the class:2 3 1. Requirements are static classes4 2the method required to write is a static method. 5 3to use the This keyword, the object that is passed in represents the current object. 6 7 Example: The Where method of the extended list collection compares the size of the string. 8     1. Create a class that is named ListExt.cs9     Ten     //1> Creating a static class One      Public StaticClass ListExt A     { -         //Create a static method: Note Use the This keyword.  -          Public Staticlist<string> Mywhere ( Thislist<string> list,func<string,BOOL>mylistext) the         { -         //iterates through the current list combination, invokes the delegate mylistext to pass in a string, returns a bool type -list<string> strlist=Newlist<string>(); -             foreach(varIteminchlist) +             { -                 if(Mylistext (item)) +                 { A Strlist.add (item); at                 } -             } -             returnstrlist; -         } -     } -  in Call the method:  -list<string> newlist=Newlist<string>(); tolist<string> Result=newlist.mywhere (A=>a.compareto ("6") >0);

---method of class extension: