设计模式-装饰模式

 1 using System;
 2 
 3 namespace 装饰模式
 4 {
 5     abstract class Component
 6     {
 7         public abstract void Operation(); 
 8     }
 9     class ConcreteComponent:Component
10     {
11         public override void Operation()
12         {
13             Console.WriteLine("需要扩展功能的对象的原有操作。");
14         }
15     }
16     abstract class Decorator:Component
17     {
18         public Component component;
19         public void SetComponent(Component component)
20         {
21             this.component = component;
22         }
23         public override void Operation()
24         {
25             if (component != null)
26             {
27                 component.Operation();
28             }
29         }
30     }
31     class ConcreteDecoratorA : Decorator
32     {
33         public override void Operation()
34         {
35             base.Operation();
36             Console.WriteLine("功能A...");
37         }
38     }
39     class ConcreteDecoratorB : Decorator
40     {
41         public override void Operation()
42         {
43             base.Operation();
44             Console.WriteLine("功能B...");
45         }
46     }
47     class Program
48     {
49         static void Main(string[] args)
50         {
51             ConcreteComponent c = new ConcreteComponent();
52             ConcreteDecoratorA ca = new ConcreteDecoratorA();
53             ConcreteDecoratorB cb = new ConcreteDecoratorB();
54             //装饰过程
55             ca.SetComponent(c);
56             cb.SetComponent(ca);
57 
58             cb.Operation();
59 
60             Console.ReadKey();
61         }
62     }
63 }