1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Web;
5
6 namespace WebApplication1
7 {
8 // HttpHandlerFactory 用法
9 //by Jxb
10 //at 2012年6月8日17:00:22
11
12
13 //web.config
14 /*<httpHandlers>
15 <add verb="*" path="*" type="WebApplication1.MyHandler,WebApplication1"/>
16 </httpHandlers>
17 */
18
19 public class _Customer
20 {
21 public _Customer()
22 {
23 this.a = 1;
24 this.b = 2;
25 }
26
27 int a, b = 0;
28 }
29 /// <summary>
30 /// Summary description for Handler1
31 /// </summary>
32
33 public class MyHandler : IHttpHandlerFactory
34 {
35
36
37 public static T Factory<T>() where T : new()
38 {
39 return new T();
40 }
41 #region IHttpHandlerFactory 成员
42
43 public IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated)
44 {
45
46 string fname = url.Substring(url.IndexOf('/') + 1);
47 while (fname.IndexOf('/') != -1)
48 fname = fname.Substring(fname.IndexOf('/') + 1);
49 string cname = fname.Substring(0, fname.IndexOf('.'));
50 string className = "WebApplication1." + cname;
51
52 object h = null;
53
54 try
55 {
56
57 //测试工厂方法，相当于下面的Activator.CreateInstance
58 //_Customer ab = Factory<_Customer>();
59
60 // 采用动态反射机制创建相应的IHttpHandler实现类。
61 h = Activator.CreateInstance(Type.GetType(className));
62 }
63 catch (Exception e)
64 {
65 throw new HttpException("工厂不能为类型" + cname + "创建实例。", e);
66 }
67
68 return (IHttpHandler)h;
69 }
70
71 public void ReleaseHandler(IHttpHandler handler)
72 {
73
74 }
75
76 #endregion
77 }
78
79
80
81
82
83 public class Handler1 : IHttpHandler
84 {
85 #region IHttpHandler 成员
86
87 public bool IsReusable
88 {
89 get { return true; }
90 }
91
92 public void ProcessRequest(HttpContext context)
93 {
94 context.Response.Write("<html><body><h1>来自Handler1的信息。</h1></body></html>");
95 }
96
97 #endregion
98 }
99
100 public class Handler2 : IHttpHandler
101 {
102 #region IHttpHandler 成员
103
104 public bool IsReusable
105 {
106 get { return true; }
107 }
108
109 public void ProcessRequest(HttpContext context)
110 {
111 context.Response.Write("<html><body><h1>来自Handler2的信息。</h1></body></html>");
112 }
113
114 #endregion
115 }
116 }
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