用C#委托实现哨兵和敌人的观察者模式！
1.代码如下：
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace DelegateImplementObserverPattern
6 {
7 public class War
8 {
9 static void Main(string[] args)
10 {
11 Enemy enemy = new Enemy();
12
13 //Using multiplecast delegates
14 enemy.FiringEvent += new FiringEventHandler(Sentry1.Fire);
15 enemy.FiringEvent += new FiringEventHandler(Sentry2.Fire);
16
17 enemy.Move();
18 }
19 }
20
21 public delegate void FiringEventHandler();
22
23 /// <summary>
24 /// Enemy
25 /// </summary>
26 public class Enemy
27 {
28 public event FiringEventHandler FiringEvent;
29
30 public void Move()
31 {
32 FiringEvent();
33 }
34 }
35
36 /// <summary>
37 /// Sentry1
38 /// </summary>
39 public class Sentry1
40 {
41 /// <summary>
42 /// Fire
43 /// </summary>
44 public static void Fire()
45 {
46 Console.WriteLine("Sentry1 firing at enemy");
47 }
48 }
49
50 /// <summary>
51 /// Sentry2
52 /// </summary>
53 public class Sentry2
54 {
55 /// <summary>
56 /// Fire
57 /// </summary>
58 public static void Fire()
59 {
60 Console.WriteLine("Sentry2 firing at enemy");
61 }
62 }
63 }
64
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace DelegateImplementObserverPattern
6 {
7 public class War
8 {
9 static void Main(string[] args)
10 {
11 Enemy enemy = new Enemy();
12
13 //Using multiplecast delegates
14 enemy.FiringEvent += new FiringEventHandler(Sentry1.Fire);
15 enemy.FiringEvent += new FiringEventHandler(Sentry2.Fire);
16
17 enemy.Move();
18 }
19 }
20
21 public delegate void FiringEventHandler();
22
23 /// <summary>
24 /// Enemy
25 /// </summary>
26 public class Enemy
27 {
28 public event FiringEventHandler FiringEvent;
29
30 public void Move()
31 {
32 FiringEvent();
33 }
34 }
35
36 /// <summary>
37 /// Sentry1
38 /// </summary>
39 public class Sentry1
40 {
41 /// <summary>
42 /// Fire
43 /// </summary>
44 public static void Fire()
45 {
46 Console.WriteLine("Sentry1 firing at enemy");
47 }
48 }
49
50 /// <summary>
51 /// Sentry2
52 /// </summary>
53 public class Sentry2
54 {
55 /// <summary>
56 /// Fire
57 /// </summary>
58 public static void Fire()
59 {
60 Console.WriteLine("Sentry2 firing at enemy");
61 }
62 }
63 }
64
2. 代码如下：
1 namespace param
2 {
3 public delegate string MyEventHandler(string message);
4
5 class Bridge
6 {
7 [STAThread]
8 static void Main(string[] args)
9 {
10 MyEventCaller mec = new MyEventCaller();
11 MyEventCallee mee = new MyEventCallee();
12 mec.MyEvent += new MyEventHandler(mee.CalleeResponse);
13
14 mec.CallerRequest();
15 }
16 }
17
18 public class MyEventCaller
19 {
20 public event MyEventHandler MyEvent;
21
22 public void CallerRequest()
23 {
24 MyEvent("Yup");
25 }
26
27 }
28
29 public class MyEventCallee
30 {
31 public string CalleeResponse(string msg)
32 {
33 return "It is wonderful";
34 }
35
36 }
37 }
2 {
3 public delegate string MyEventHandler(string message);
4
5 class Bridge
6 {
7 [STAThread]
8 static void Main(string[] args)
9 {
10 MyEventCaller mec = new MyEventCaller();
11 MyEventCallee mee = new MyEventCallee();
12 mec.MyEvent += new MyEventHandler(mee.CalleeResponse);
13
14 mec.CallerRequest();
15 }
16 }
17
18 public class MyEventCaller
19 {
20 public event MyEventHandler MyEvent;
21
22 public void CallerRequest()
23 {
24 MyEvent("Yup");
25 }
26
27 }
28
29 public class MyEventCallee
30 {
31 public string CalleeResponse(string msg)
32 {
33 return "It is wonderful";
34 }
35
36 }
37 }
