Demonstrate multicasting : Multi cast delegate : Delegate C# Examples

Create an invocation list, or chain, of methods that will be called when a delegate is invoked.




    
using  System;  
  
delegate  string  StrMod(ref  string  str);  
  
class  MultiCastDemo  {  
    static  string  replaceSpaces(ref  string  a)  {  
        Console.WriteLine("replaceSpaces");  
        return  a;  
    }    
  
    static  string  removeSpaces(ref  string  a)  {  
        Console.WriteLine("removeSpaces");  
        return  a;  
    }    
  
    static  string  reverse(ref  string  a)  {  
        Console.WriteLine("reverseSpaces");  
        return  a;  
    }  
          
    public  static  void  Main()  {    
        StrMod  strOp;  
        StrMod  replaceSp  =  new  StrMod(replaceSpaces);  
        StrMod  removeSp  =  new  StrMod(removeSpaces);  
        StrMod  reverseStr  =  new  StrMod(reverse);  
        string  str  =  "This  is  a  test";  
  
        //  Set  up  multicast.  
        strOp  =  replaceSp;  
        strOp  +=  reverseStr;  
  
        //  Call  multicast.  
        strOp(ref  str);  
          
        //  Remove  replace  and  add  remove.  
        strOp  -=  replaceSp;  
        strOp  +=  removeSp;  
  
        str  =  "This  is  a  test.";  //  reset  string  
  
        //  Call  multicast.  
        strOp(ref  str);  
    }  
}