创建型设计模式之原型模式(Prototype)

 1  using System;
 2 
 3     // Objects which are to work as prototypes must be based on classes which 
 4     // are derived from the abstract prototype class
 5     abstract class AbstractPrototype 
 6     {
 7         abstract public AbstractPrototype CloneYourself();
 8     }
 9 
10     // This is a sample object
11     class MyPrototype : AbstractPrototype 
12     {
13         override public AbstractPrototype CloneYourself()
14         {
15             return ((AbstractPrototype)MemberwiseClone());
16         }
17         // lots of other functions go here!
18     }
19 
20     // This is the client piece of code which instantiate objects
21     // based on a prototype. 
22     class Demo 
23     {
24         private AbstractPrototype internalPrototype;
25 
26         public void SetPrototype(AbstractPrototype thePrototype)
27         {
28             internalPrototype = thePrototype;            
29         }
30 
31         public void SomeImportantOperation()
32         {
33             // During Some important operation, imagine we need
34             // to instantiate an object - but we do not know which. We use
35             // the predefined prototype object, and ask it to clone itself. 
36 
37             AbstractPrototype x;
38             x = internalPrototype.CloneYourself();
39             // now we have two instances of the class which as as a prototype
40         }
41     }
42 
43     /// <summary>
44     ///    Summary description for Client.
45     /// </summary>
46     public class Client
47     {
48         public static int Main(string[] args)
49         {                        
50             Demo demo = new Demo();
51             MyPrototype clientPrototype = new MyPrototype();
52             demo.SetPrototype(clientPrototype);
53             demo.SomeImportantOperation();
54 
55             return 0;
56         }
57     }