思路

写两个类，一个类A的方法注册另一个类B的事件，当类B的事件触发(invoke)的时候,会调用A的方法.

测试委托的demo

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

namespace _9_测试委托
{

    class DEvent
    {
        public delegate void dReceiver(object sender, string str);
        public event dReceiver receive;
        public void invokeEvent(object sender,string str)
        {
            receive.Invoke(sender, str);
        }
    }

    class Program
    {
        public void BeCalled(object obj,string msg)
        {
            Console.WriteLine(msg);
        }
        public void useEvent()
        {
            DEvent de = new DEvent();
            de.receive += new DEvent.dReceiver(this.BeCalled);
            for (int i = 0; i < 10; i++)
            {
                de.invokeEvent(null, "呵呵" + i);
                System.Threading.Thread.Sleep(1000);

            }

        }
        static void Main(string[] args)
        {
            Program p = new Program();
            p.useEvent();
        }
}