简单.net事件模型

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

namespace ConsoleApplication1
{
    public class Program
    {
        static void Main(string[] args)
        {
            publisher p = new publisher("P");
            Receive r = new Receive();
            p.Sayhello += new publisher.SayhelloEventHandler(r.tip);
            p.OnSayhello("OK");
        }


    }
    public class Receive
    {
        public void tip(String s)
        {
            Console.WriteLine("Reciver Heard: " + s);
        }
    }

    public class publisher
    {
        public String Name { get; set; }
        public publisher() { }
        public publisher(String name) { this.Name = name; }
        public delegate void SayhelloEventHandler(String s);
        public event SayhelloEventHandler Sayhello;

        public void OnSayhello(String s)
        {
            if (this.Sayhello != null)
            {
                Console.WriteLine("PUBLISH Say " + s);
                Sayhello(s);
            }

        }
    }

}