Stragegy Pattern(策略模式)应用之"鸭子类" (C#源代码)

 

1. using System;
2. using System.Text;
4. namespace NMDuck
5. {
6.     public class CRunMain
7.     {
8.         public static int Main()
9.         {
10.             //normal duck
11.             CDuck objDuck = new CMallardDuck();
13.             objDuck.Display();
14.             objDuck.PerformFly();
15.             objDuck.PerformQuack();
17.             //set for model duck;
18.             objDuck = new CModelDuck();
19.             objDuck.PerformFly();
21.             objDuck.SetFlyBehavior(new CFlyRocketPowered());
22.             objDuck.PerformFly();
24.             return 0;
25.         }
26.     }
28.     public abstract class CDuck
29.     {
30.         public abstract void Display();
32.         public void PerformFly()
33.         {
34.             this.m_objFly.Fly();
35.         }
37.         public void PerformQuack()
38.         {
39.             this.m_objQuack.Quack();
40.         }
42.         public void Swim()
43.         {
44.             Console.WriteLine("All ducks float, even decoys!");
45.         }
47.         public void SetFlyBehavior(IFlyBehavior objFly)
48.         {
49.             this.m_objFly = objFly;
50.         }
52.         public void SetQuackBehavior(IQuackBehavior objQuack)
53.         {
54.             this.m_objQuack = objQuack;
55.         }
57.         protected IQuackBehavior m_objQuack;
58.         protected IFlyBehavior m_objFly;
59.     };
61.     public class CMallardDuck:CDuck
62.     {
63.         public CMallardDuck()
64.         {
65.             this.m_objFly = new CFlyWithWings();
66.             this.m_objQuack = new CQuack();
67.         }
69.         public override void Display()
70.         {
71.             Console.WriteLine("i am CMallardDuc");
72.         }
73.     }
75.     public class CModelDuck:CDuck
76.     {
77.         public CModelDuck()
78.         {
79.             this.m_objFly = new CFlyNoway();
80.             this.m_objQuack = new CQuack();
81.         }
83.         public override void Display()
84.         {
85.             Console.WriteLine("I am CModelDuck");
86.         }
88.     }
90.     public interface IQuackBehavior
91.     {
92.         void Quack();
93.     }
95.     public class CQuack:IQuackBehavior
96.     {
97.         //IQuackBehavior Members
98.         public void Quack()
99.         {
100.             Console.WriteLine("quack!");
101.         }
102.     }
104.     public class CMuteQuack:IQuackBehavior
105.     {
106.         //IQuackBehavior Members
107.         public void Quack()
108.         {
109.             Console.WriteLine("Silence!");
110.         }
111.     }
113.     public class CSqueak: IQuackBehavior
114.     {
115.         //IQuackBehavior Members
116.         public void Quack()
117.         {
118.             Console.WriteLine("Squeak!");
119.         }
120.     }
122.     public interface IFlyBehavior
123.     {
124.         void Fly();
125.     }
127.     public class CFlyWithWings:IFlyBehavior
128.     {
129.         //IFlyBehavior
130.         public void Fly()
131.         {
132.             Console.WriteLine("I am flying!");
133.         }
134.     }
136.     public class CFlyNoway:IFlyBehavior
137.     {
138.         //IFlyBehavior
139.         public void Fly()
140.         {
141.             Console.WriteLine("I can't fly!");
142.         }
143.     }
144.     
145.     public class CFlyRocketPowered: IFlyBehavior
146.     {
147.         // IFlyBehavior Members
148.         public void Fly()
149.         {
150.             Console.WriteLine("I am flying with a rocket!");
151.         }
152.     }
154. }