/// <summary>
 /// 订单明细列表(返回Json)
 /// </summary>
 /// <param name="billNo">订单号</param>
 /// <returns></returns>
 public ActionResult GetOrderItemList(string billNo)
 {
     try
     {
         List <SaleOrderItemEntity> items = billNo.ToLower().StartsWith("so")
             ? _orderBll.GetOrderItemList(billNo)
             : _orderBll.GetOrderItemListByExpressNum(billNo);
         var jsonData = new
         {
             rows = items
         };
         return(Content(jsonData.ToJson()));
     }
     catch (Exception ex)
     {
         BaseSysLogBll.Instance.WriteLog("", OperationType.Query, "-1", "异常错误:" + ex.Message);
         return(null);
     }
 }