public static void DeleteNotificationRequest(
            string userid,
            List <string> notificationIdList,
            Action <Models.DelNotificationResponse> successCallback,
            Action <string> failureCallback,
            Action <Exception> errorCallback)
        {
            string url = "http://116.11.253.243:11888/lungcare/webapi/lungcare/DelNotification";
            int    n   = notificationIdList.Count;

            for (int i = 0; i < notificationIdList.Count; i++)
            {
                Models.DelNotificationRequest request = new Models.DelNotificationRequest();
                request.Sender         = "PC Client";
                request.Token          = LungCare.SupportPlatform.Security.TokenManager.Token;
                request.UserId         = userid;
                request.NotificationID = notificationIdList[i];
                if (i == n - 1)
                {
                    Util.PostAsync <Models.DelNotificationResponse>(
                        request,
                        url,
                        successCallback,
                        failureCallback,
                        errorCallback
                        );
                }
                else
                {
                    Util.PostAsync <Models.DelNotificationResponse>(
                        request,
                        url,
                        null,
                        failureCallback,
                        errorCallback
                        );
                }
            }
            //foreach (var item in notificationIdList)
            //{
            //    Models.DelNotificationRequest request = new Models.DelNotificationRequest();
            //    request.Sender = "PC Client";
            //    request.Token = LungCare.SupportPlatform.Security.TokenManager.Token;
            //    request.UserId = userid;
            //    request.NotificationID = item;
            //    Util.PostAsync<Models.DelNotificationResponse>(
            //        request,
            //        url,
            //        successCallback,
            //        failureCallback,
            //        errorCallback
            //        );
            //}
        }
        public static void DeleteNotificationRequest(
            string userid,
            string notificationId,
            Action <Models.DelNotificationResponse> successCallback,
            Action <string> failureCallback,
            Action <Exception> errorCallback)
        {
            string url = "http://116.11.253.243:11888/lungcare/webapi/lungcare/DelNotification";

            Models.DelNotificationRequest request = new Models.DelNotificationRequest();
            request.Sender         = "PC Client";
            request.Token          = LungCare.SupportPlatform.Security.TokenManager.Token;
            request.UserId         = userid;
            request.NotificationID = notificationId;
            Util.PostAsync <Models.DelNotificationResponse>(
                request,
                url,
                successCallback,
                failureCallback,
                errorCallback
                );
        }