设计模式学习笔记--观察者模式

 1 namespace Observer
 2 {
 3     public interface Subject
 4     {
 5         void Notify();
 6 
 7         string SubjectState
 8         {
 9             get;
10             set;
11         }
12     }
13 }

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 1 using System;
 2 
 3 namespace Observer
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/28 8:46:39 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Boss说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class Boss:Subject
12     {
13         public event EventHandler Update;
14 
15         private string action;
16 
17         public void Notify()
18         {
19             Update();
20         }
21 
22         public string SubjectState
23         {
24             get
25             {
26                 return action;
27             }
28             set
29             {
30                 action = value;
31             }
32         }
33     }
34 }

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 1 using System;
 2 
 3 namespace Observer
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/28 8:48:31 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Secretary说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class Secretary:Subject
12     {
13         public event EventHandler Update;
14 
15         private string action;
16 
17         public void Notify()
18         {
19             Update();
20         }
21 
22         public string SubjectState
23         {
24             get
25             {
26                 return action;
27             }
28             set
29             {
30                 action = value;
31             }
32         }
33     }
34 }

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1 using System;
2 
3 namespace Observer
4 {
5     public delegate void EventHandler();
6 }

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 1 using System;
 2 
 3 namespace Observer
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/28 8:37:06 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// StockObserver说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class StockObserver
12     {
13         private string name;
14         private Subject subject;
15 
16         public StockObserver(string name,Subject subject)
17         {
18             this.name = name;
19             this.subject = subject;
20         }
21 
22         public void CloseStockMarket()
23         {
24             Console.WriteLine("{0}{1} 关闭股票行情,继续工作！",subject.SubjectState,name);
25         }
26     }
27 }

View Code

 1 using System;
 2 
 3 namespace Observer
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/28 8:42:40 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// NBAObserver说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class NBAObserver
12     {
13         private string name;
14         private Subject subject;
15 
16         public NBAObserver(string name,Subject subject)
17         {
18             this.name = name;
19             this.subject = subject;
20         }
21 
22         public void CloseNBADirectSeeding()
23         {
24             Console.WriteLine("{0}{1} 关闭NBA直播，继续工作！",subject.SubjectState,name);
25         }
26     }
27 }

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 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Observer
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             Boss huhansan = new Boss();
14 
15             StockObserver stockObserver = new StockObserver("魏关姹",huhansan);
16             NBAObserver nbaObserver = new NBAObserver("易管查",huhansan);
17 
18             huhansan.Update += new EventHandler(stockObserver.CloseStockMarket);
19             huhansan.Update += new EventHandler(nbaObserver.CloseNBADirectSeeding);
20 
21             huhansan.SubjectState = "我胡汉三回来了！";
22             huhansan.Notify();
23         }
24     }
25 }

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