一个委托的小例子

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Text;

namespace  DelegateSample
{
     public   delegate   void  DelegateReportProgress( int  progress);


     class  Program
    {
         static   void  Main( string [] args)
        {
            CalculateClass c  =   new  CalculateClass();
            c.CalculateReportMethod  =   new  DelegateReportProgress(ReportCalculateProgress);
            c.CalculateBigNum();
            Console.WriteLine( " 我想换一种报告的样式我可以: " );

            c.CalculateReportMethod  =   new  DelegateReportProgress(ReportCalculateProgress2);
            c.CalculateBigNum();

            Console.ReadLine();
        }

         static   void  ReportCalculateProgress( int  progress)
        {
            Console.WriteLine( " 当前的计算进度是:  " + progress.ToString());
        }

         static   void  ReportCalculateProgress2( int  progress)
        {
            Console.WriteLine( " 当前的计算剩余的进度是:  "   +  Convert.ToString( 100   -  progress));
        }
    }

     public   class  CalculateClass
    {
         public  DelegateReportProgress CalculateReportMethod; // 定义一个方法指针

         public   void  CalculateBigNum()
        {
             for  ( int  i  =   0 ; i  <   100 ; i ++ )
            {
                 for  ( int  j  =   0 ; j  <   10000000 ; j ++ )
                {

                }
                CalculateReportMethod(i);
            }
        }
    }
}