事件模型

  1 //事件通知类
  2 using System;
  3 using System.Collections.Generic;
  4 using System.Linq;
  5 using System.Text;
  6 using System.Threading.Tasks;
  7 
  8 namespace EventDemo
  9 {
 10     public class NotifyEventArgs : EventArgs
 11     {
 12         private readonly string notifyName;
 13         public NotifyEventArgs(string name)
 14         {
 15             notifyName = name;
 16         }
 17 
 18         public string NotifyName
 19         {
 20             get { return notifyName; }
 21         }
 22     }
 23 
 24 
 25     public class EventNotify
 26     {
 27         public event EventHandler<NotifyEventArgs> NewNotify;
 28 
 29         public void Notify(string name)
 30         {
 31             NotifyEventArgs arg = new NotifyEventArgs(name);
 32             arg.Raise(this, ref NewNotify);
 33         }
 34     }
 35 }
 36 
 37 
 38 //事件接受类
 39 using System;
 40 using System.Collections.Generic;
 41 using System.Linq;
 42 using System.Text;
 43 using System.Threading.Tasks;
 44 
 45 namespace EventDemo
 46 {
 47    public class EventReceive
 48     {
 49        string name;
 50        public EventReceive(string name,EventNotify en)
 51        {
 52            this.name = name;
 53            en.NewNotify += Receive;
 54        }
 55 
 56        private void Receive(object sender, NotifyEventArgs args)
 57        {
 58            Console.WriteLine(name+ " receive:"+args.NotifyName);
 59        }
 60     }
 61 }
 62 
 63 
 64 //线程安全事件扩展类
 65 using System;
 66 using System.Collections.Generic;
 67 using System.Linq;
 68 using System.Text;
 69 using System.Threading;
 70 using System.Threading.Tasks;
 71 
 72 namespace EventDemo
 73 {
 74   public static  class EventArgsExtensions
 75     {
 76       public static void Raise<T>(this T e, object sender, ref EventHandler<T> eventDelegate) where T : EventArgs
 77       {
 78           EventHandler<T> temp = Interlocked.CompareExchange(ref eventDelegate,null,null);
 79           if (temp != null)
 80           {
 81               temp(sender,e);
 82           }
 83       }
 84     }
 85 }
 86 
 87 
 88 //调用类
 89 using System;
 90 using System.Collections.Generic;
 91 using System.Linq;
 92 using System.Text;
 93 using System.Threading.Tasks;
 94 
 95 namespace EventDemo
 96 {
 97     class Program
 98     {
 99         static void Main(string[] args)
100         {
101             EventNotify notify = new EventNotify();
102 
103             EventReceive receive = new EventReceive("reveive1", notify);
104             EventReceive receive2 = new EventReceive("reveive2", notify);
105             EventReceive receive3 = new EventReceive("reveive3", notify);
106 
107             notify.Notify("notify1");
108 
109             Console.ReadLine();
110         }
111     }
112 }