public ResultEntity <panAccessToken> panCallback()
        {
            ResultEntity <panAccessToken> result = new ResultEntity <panAccessToken>();

            try
            {
                NLogUtil.cc_InfoTxt($"pancallback comming");
                string code = HttpContext.Request.Query["code"];
                if (!string.IsNullOrEmpty(code))
                {
                    //  NLogUtil.cc_InfoTxt($"pancallback:{code}");
                    string url = @$ "https://openapi.baidu.com/oauth/2.0/token?grant_type=authorization_code&code={code}&client_id=YunvBnAcNTqOr3SbAGGoFNx9TAYwfX2k&client_secret=irhor1R0COYhjm8x2CyfUBGGb1Ggt07T&redirect_uri=http://ccapi.iqianba.cn/baidu/pancallback";
                    NLogUtil.cc_InfoTxt($"pancallback:{url}");

                    panAccessToken accessToken = HttpUtil.Get <panAccessToken>(url);
                    result.Entity = accessToken;

                    _baiduPanService.SaveAccessToken(accessToken);
                }
            }
            catch (Exception ex)
            {
                result.ErrorMsg = ex.Message;
            }
            return(result);
        }