//查询主从表
            var qJoin = (from s in q
                         join b in q1 on s.PONO equals b.PONO into tmp //必须使用左连，避免无明细表出不了数据
                         from b in tmp.DefaultIfEmpty()
                         select new res_PO
                         {
                             isid = s.isid,
                             PONO = s.PONO,
                             DocDate = s.DocDate,
                             POUser = s.POUser,
                             DocType = s.DocType,
                             SupplierCode = s.SupplierCode,
                             SupplierName = s.SupplierName,
                             SupplierAddress = s.SupplierAddress,
                             SupplierTel = s.SupplierTel,
                             SupplierFax = s.SupplierFax,
                             SupplierContact = s.SupplierContact,
                             SupplierContactPhone = s.SupplierContactPhone,
                             PayType = s.PayType,
                             FlagStop = s.FlagStop,
                             FlagPrint = s.FlagPrint,
                             Remark = s.Remark,
                             CreationDate = s.CreationDate,
                             CreatedBy = s.CreatedBy,
                             LastUpdateDate = s.LastUpdateDate,
                             LastUpdatedBy = s.LastUpdatedBy,
                             FlagApp = s.FlagApp,
                             AppUser = s.AppUser,
                             AppDate = s.AppDate,
                             DeliveryDate = s.DeliveryDate,
                             TotalAmount = s.TotalAmount,
                             TotalSquar = s.TotalSquar,
                             TotalVolumn = s.TotalVolumn,
                             TotalWeight = s.TotalWeight,

                             //明细表字段
                             CustomerGoodsNo = b == null ? "" : b.GoodsNo,
                             CustomerOrderNo = b == null ? "" : b.CustomerOrderNo,
                             PaperLength = b == null ? 0 : b.PaperLength,
                             PaperName = b == null ? "" : b.PaperName,
                             PaperNameProduce = b == null ? "" : b.PaperNameSupplier,
                             PaperSpec = b == null ? "" : b.PaperSpec,
                             PaperSpecProduce = b == null ? "" : b.SupplierSpec,
                             PaperWidth = b == null ? 0 : b.PaperWidth,
                         }
                         ).Distinct();

            //返回查询结果
            return qJoin.OrderByDescending(o => o.CreationDate).ToList();

        public override void DoApproval(IButtonInfo button)
        {
            AssertFocusedRow();

            var row = (res_SO)_SummaryView.GetFocusedRow();

            if (row.FlagApp == "Y")
            {
                Msg.Warning($"单据 <{row.SONO}> 已经审核,不可重复操作！");
            }
            else
            {
                if (Msg.AskQuestion($"确定要审核单据 <{row.SONO}> 吗? "))
                {
                    if (_BLL.ApprovalBusiness(row)) //审核单据
                    {
                        //更新表格缓存记录的审核状态
                        gvSummary.GetDataSource<res_SO>()
                            .Where(w => w.SONO == row.SONO).ToList().ForEach(i => i.FlagApp = "Y");
                        gvSummary.RefreshData();

                        if (this.IsShowDetailPage)
                        {
                            this.DoViewContent(null);//显示单据明细
                        }
                    }
                }
            }
        }