LINQ Learning Notes-(1) Adding extension methods

Purpose: to extend the behavior of an already existing type

Precautions:

An extension method is a special kind of static method extension method that must be defined in a static class with an extension method that has less precedence than a class method extension method with the same name only valid within a specific namespace unless the extension method must not be abused

 public  static  class   Extramethod { public  
   
    static  
    string  topascal (
    this  Span style= "color: #0000ff;" >string  
     s) { 
    // 
     capitalize the first letter of the string, other lowercase  
    return  s.substring (
    0 , 
    1 ). ToUpper () + s.substring (
    1  
    ).        ToLower (); }    }
   

Static void Main (string[] args)        {              string"abcdefgh";              Console.WriteLine (S.topascal ());              Console.read ();        }

Execution Result:

LINQ Learning Notes-(1) Adding extension methods