3.4以下版本，微信登录中文乱码问题！

服务器设置编码为utf-8,可以参考：

string send_url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + access_token + "&openid=" + open_id;
string result = Utils.HttpGet(send_url);

        public static string HttpGet(string url)
        {
            WebClient wc = new WebClient();
            wc.Credentials = CredentialCache.DefaultCredentials;
            wc.Encoding = Encoding.UTF8;
            string returnText = wc.DownloadString(url);

            if (returnText.Contains("errcode"))
            {
                log.Error(returnText);
            } 
            return returnText;
        }

3.4正式版以上版本已经不存在乱码问题！