<%@ WebHandler Language="C#" Class="UserAuth" %>

 public class UserAuth : IHttpHandler

 {

     public void ProcessRequest(HttpContext context)

     {

         var appid = "wxf1c24c60e3ac13b7";

         var secret = "5902b9817acb7a290d4b7c2e6e97d4d3";

         var code = context.Request.QueryString["Code"];

         if (string.IsNullOrEmpty(code))

         {

             var url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri=http%3a%2f%2fwx.alinq.org%2fTest%2fUserAuth.ashx&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect", appid);

             context.Response.Redirect(url);

         }

         else

         {

             var client = new System.Net.WebClient();

             client.Encoding = System.Text.Encoding.UTF8;

             var url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, secret, code);

             var data = client.DownloadString(url);

             var serializer = new JavaScriptSerializer();

             var obj = serializer.Deserialize<Dictionary<string, string>>(data);

             string accessToken;

             if (!obj.TryGetValue("access_token", out accessToken))

                 return;

             var opentid = obj["openid"];

             url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN", accessToken, opentid);

             data = client.DownloadString(url);

             var userInfo = serializer.Deserialize<Dictionary<string, object>>(data);

             foreach (var key in userInfo.Keys)

             {

                 context.Response.Write(string.Format("{0}: {1}", key, userInfo[key]) + "<br/>");

             }

         }

     }

 }