.NET微信通过授权获取用户的基本信息

一、填写授权回调页面的域名

二、引导用户到指定的授权页面

例如：https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

redirect_uri 是一个 url

三、最后奉上完整实现的代码

下面是完整的代码，希望对大家有用。

 <%@ 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/>");
             }
         }
     }
 }