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);
            }
        }
    }
}