DataRow drrow = clsYHAlert.dtCurrentAlarmTable.NewRow();

        drrow["NMSAlertid"] = 3300165;
        drrow["platformName"] = "成都寿险";
        drrow["carrieroperatorName"] = "九州移动";
        drrow["ipAddr"] = "172.16.0.39";
        drrow["phoneNum"] = "15110926250";
        drrow["sendTime"] = "2018-7-17 16:02:49";
        drrow["findTimes"] = 1;

        clsYHAlert.dtCurrentAlarmTable.Rows.Add(drrow);

        string strYestoryNow = DateTime.Now.AddDays(-1).ToString();
        string filterExpression = string.Format("sendTime<=#{0}#", strYestoryNow);
        DataRow[] drDelete = clsYHAlert.dtCurrentAlarmTable.Select(filterExpression);
        foreach (DataRow dr in drDelete)
        {
            clsYHAlert.dtCurrentAlarmTable.Rows.Remove(dr);
            clsYHAlert.dtCurrentAlarmTable.AcceptChanges();
        }