事件模型

 //事件通知类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
 namespace EventDemo
 {
     public class NotifyEventArgs : EventArgs
     {
         private readonly string notifyName;
         public NotifyEventArgs(string name)
         {
             notifyName = name;
         }
 
         public string NotifyName
         {
             get { return notifyName; }
         }
     }
 
 
     public class EventNotify
     {
         public event EventHandler<NotifyEventArgs> NewNotify;
 
         public void Notify(string name)
         {
             NotifyEventArgs arg = new NotifyEventArgs(name);
             arg.Raise(this, ref NewNotify);
         }
     }
 }
 
 
 //事件接受类
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace EventDemo
 {
    public class EventReceive
     {
        string name;
        public EventReceive(string name,EventNotify en)
        {
            this.name = name;
            en.NewNotify += Receive;
        }
 
        private void Receive(object sender, NotifyEventArgs args)
        {
            Console.WriteLine(name+ " receive:"+args.NotifyName);
        }
     }
 }
 
 
 //线程安全事件扩展类
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 
 namespace EventDemo
 {
   public static  class EventArgsExtensions
     {
       public static void Raise<T>(this T e, object sender, ref EventHandler<T> eventDelegate) where T : EventArgs
       {
           EventHandler<T> temp = Interlocked.CompareExchange(ref eventDelegate,null,null);
           if (temp != null)
           {
               temp(sender,e);
           }
       }
     }
 }
 
 
 //调用类
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace EventDemo
 {
     class Program
     {
         static void Main(string[] args)
         {
             EventNotify notify = new EventNotify();
 
             EventReceive receive = new EventReceive("reveive1", notify);
             EventReceive receive2 = new EventReceive("reveive2", notify);
             EventReceive receive3 = new EventReceive("reveive3", notify);
 
             notify.Notify("notify1");
 
             Console.ReadLine();
         }
     }
 }