1using System;
 2using System.Collections.Generic;
 3using System.Text;
 4
 5namespace ProxyDemo
 6{
 7    class SubjectAccessor
 8    {
 9        public interface ISubject
10        {
11            string Request();
12        }
13
14        private class Subject
15        {
16            public string Request()
17            {
18                return "Subject Request " + "Choose left door\n";
19            }
20        }
21
22        public class Proxy : ISubject
23        {
24            Subject subject;
25
26            public string Request()
27            {
28                // 虚拟代理仅在方法被第一次调用时创建对象
29                if (subject == null)
30                {
31                    Console.WriteLine("Subject inactive");
32                    subject = new Subject();
33                }
34
35                Console.WriteLine("Subject active");
36                return "Proxy: Call to " + subject.Request();
37            }
38        }
39
40        public class ProtectionProxy : ISubject
41        {
42            // 认证代理首先要求一个密码
43            Subject subject;
44            string password = "abc";
45
46            public string Authenticate(string supplied)
47            {
48                if (supplied != password)
49                    return "Protection Proxy: NO access";
50                else
51                    subject = new Subject();
52                return "Protetion Proxy: Authenticated";
53            }
54
55            public string Request()
56            {
57                if (subject == null)
58                    return "Proctection Proxy: Authentictate first";
59                else
60                    return "Proctection Proxy: Call to " + subject.Request();
61            }
62        }
63    }
64}
65
 

Client
 1using System;
 2using System.Collections.Generic;
 3using System.Text;
 4
 5namespace ProxyDemo
 6{
 7    class Client : SubjectAccessor
 8    {
 9        static void Main(string[] args)
10        {
11            Console.WriteLine("Proxy Pattery\n");
12
13            ISubject subject = new Proxy();
14            Console.WriteLine(subject.Request());
15            Console.WriteLine(subject.Request());
16
17            ISubject protectionproxy = new ProtectionProxy();
18            Console.WriteLine(protectionproxy.Request());
19
20            Console.WriteLine((protectionproxy as ProtectionProxy).Authenticate("Secret"));
21            Console.WriteLine((protectionproxy as ProtectionProxy).Authenticate("abc"));
22
23            Console.WriteLine(protectionproxy.Request());
24
25            Console.ReadLine();
26        }
27    }
28}
29

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