/// <summary> /// 检测是否存在,并添加 /// </summary> /// <typeparam name="TItem"></typeparam> /// <param name="p"></param> /// <returns></returns> public new int Add(Freight p) { var item = QueryItem(b => b.AreaId == p.AreaId && b.DeliverType == p.DeliverType); if (item != null) { return(0); } //helper.Clear(); int id = Add(p); return(id); }