Session s = ((XPObjectSpace)ObjectSpace).Session; XPQuery<Ord_OrderMain> queryOrders = s.Query<Ord_OrderMain>(); var p = from order in queryOrders where order.CurrentStatus == Enu_OrderStatus.WaitPrint group order by new { Oid = order.TranShop.Oid, ShopName = order.TranShop.ShopName ...