1  public interface IMobilePhone
 2     {
 3         void Call();
 4         void SendMessage(string message);
 5     }
 6     public class NormalPhone : IMobilePhone
 7     {
 8 
 9         public void Call()
10         {
11             Console.WriteLine("使用普通手机打电话");
12         }
13 
14         public void SendMessage(string message)
15         {
16             Console.WriteLine("使用普通手机发送消息:"+message);
17         }
18     }
19     public class ItelligentPhone : IMobilePhone
20     {
21 
22         public void Call()
23         {
24             Console.WriteLine("使用智能手机打电话");
25         }
26 
27         public void SendMessage(string message)
28         {
29             Console.WriteLine("使用智能手机发送消息:" + message);
30         }
31     }
32     public abstract class HighPricePhone
33     {
34         public IMobilePhone MobilePhone { get; set; }
35         public HighPricePhone(IMobilePhone mobilePhone)
36         {
37             this.MobilePhone = mobilePhone;
38         }
39         public virtual void Call()
40         {
41             MobilePhone.Call();
42         }
43         public virtual void SendMessage(string message)
44         {
45             MobilePhone.SendMessage(message);
46         }
47         public abstract void Cost();
48     }
49     public class SunPhone : HighPricePhone
50     {
51         public override void Cost()
52         {
53             Console.WriteLine("it is soso");
54         }
55     }
56     public class AppPhone : HighPricePhone
57     {
58         public override void Cost()
59         {
60             Console.WriteLine("it is not bad");
61         }
62     }