/// <summary>
        /// 客户收款提醒
        /// </summary>
        public void RemindDemo()
        {
            DingTalkApp        ding    = new DingTalkApp();
            DingTalkCorpConfig config  = ding.GetAccessToken();
            DateTime           nowtime = DateTime.Now;

            DayOfWeek dayofweek = DateTime.Now.DayOfWeek;

            try
            {
                List <string> users = new List <string>();
                users.Add("manager6639");

                string linktitle = "立即查看";
                string linkurl   = Configs.GetValue("WebSiteUrl") + "/ProductManage/Customer/Details?keyValue=111";
                if (users.Count > 0)
                {
                    string title = "客户收款提醒";
                    string msg   = string.Format("# 张三的收款截止日期还有7天,请营销经理关注   \n  收款止日:2019-10-10  \n  # 销售经理:李维民");
                    SendWorkMessageResult result = WorkMessageApi.SendMessagebyActionCard(
                        config.AccessToken, 211500037030, EnumClass.RecvType.UseridList, users, title, msg, linktitle, linkurl);
                    if (!result.IsSuccess)
                    {
                        Log log = LogFactory.GetLogger("ErrorLog");
                        log.Info(result.Errmsg);
                    }
                }
            }
            catch (Exception ex)
            {
                return;
            }
        }