1 using System;
 2 using System.Web;
 3 
 4 public class wx : IHttpHandler {
 5     
 6     public void ProcessRequest (HttpContext context) 
 7     {
 8         context.Response.ContentType = "text/plain";
 9         //
10         if (context.Request.HttpMethod.ToLower().Equals("get"))
11         {
12             ValidateUrl();
13         }
14         else {
15             context.Response.Write("wgx:post");
16         }
17     }
18    #region 服务器地址校验
19     /// <summary>
20     /// 服务器地址校验
21     /// </summary>
22     public void ValidateUrl()
23     {
24         /* signature    微信加密签名，signature结合了开发者填写的token参数和请求中的timestamp参数、nonce参数。
25             timestamp    时间戳
26             nonce    随机数
27             echostr    随机字符串
28         */
29         //接收请求过来的参数
30         HttpContext context = HttpContext.Current;
31         string signature = context.Request["signature"];
32         string timestamp = context.Request["timestamp"];
33         string nonce = context.Request["nonce"];
34 
35         string echostr = context.Request["echostr"];
36         
37         string token = "weixinduang";
38         string[] temp1 = { token, timestamp, nonce };
39         //1.字典序排序
40         Array.Sort(temp1);
41         //2.将3个参数字符串拼接成一个字符串后进行sha1加密
42         string str = string.Join("", temp1);
43         string strResult = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "SHA1");
44         //3.开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
45         if (strResult.ToLower().Equals(signature))
46         {
47             context.Response.Write(echostr);
48         }
49     } 
50     #endregion
51         
52     public bool IsReusable {
53         get {
54             return false;
55         }
56     }
57 }