【第三方登录】之微信第三方登录

网站微信第三方登录里面，用的是 微信开放平台  中申请的 APPID 和 APPSECRET。回调地址下的代码如下：

 public partial class WeiXinLogin : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            WeiXinLoginAPI();
        }

        public const string APPID = "";
        public const string APPSECRET = "";

        public void WeiXinLoginAPI()
        {
            string errorCode = "微信登录过期,请重新登录！";
            var code = Request.QueryString["Code"];
            try
            {
                if (!string.IsNullOrEmpty(code))
                {

                    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, APPSECRET, code);
                    var data = Tools.GetPage(url);
                    Log.Debug("第一个接口", data);
                    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 = Tools.GetPage(url);
                    Log.Debug("第二个接口", data);
                    var userInfo = serializer.Deserialize<Dictionary<string, object>>(data);
                    #region 同步数据到您的平台操作 Begin
                    if (opentid != null && userInfo["nickname"] != null)
                    {
                        try
                        {
                                Users _MTUsers =  GetModel( openid);  //获取用户信息

                                if (_MTUsers == null)
                                {
                                  Insert(_MTUsers);  //如果不存在，创建
                                }
                                else
                                {
                                    _MTUsers.LastLogin = DateTime.Now;
                                    _MTUsers.LastUpdated = DateTime.Now;
                                    Instance.MTUsers.Business.Update(_MTUsers);  //存在则修改
                                }
                                Session["CurrentUser"] = _MTUsers;               //将当前登录的用户放入session中
                        }
                        catch (Exception ex)
                        {
                            Response.Write("异常信息：" + ex.ToString());
                        }

                    }
                    else
                    {
                        errorCode = "微信登录身份过期";
                    }
                    #endregion
                }
            }
            catch (Exception ex)
            {
                Log.Debug("【异常】", errorCode + ";异常信息：" + ex.Message.ToString());
            }
          }
 }