NHibernate LINQ 加入 2 个查询以检索最近 4 个供应商的股票

Question

我必须检索库存和最近的 4 个供应商。我得到了一份清单。获得了另一个列表中供应商的采购订单。想要获得所有库存与最近 4 个采购供应商的合并结果（如果有）。我不擅长 LINQ，这也是 NHibernate

这是我更新的作品。寻求如何编写第三个 LINQ sql 来获得这个。

       IEnumerable<StockDetailReportModal> stockDetail = Session.Query<Stock>()
            .Where(predicate)
            .ToList()
            .Select(n => new StockDetailReportModal
            {
                Id = n.Id,
                Number = n.Number,
                PaddedNumber = n.PaddedNumber,
                Buyer = n.Buyer == null ? string.Empty : n.Buyer.FullName,
                SalesTaxCode = n.SalesTaxCode == null ? null : n.SalesTaxCode.Code,
                PurchasingUnitOfMeasure = n.PurchasingUnitOfMeasure,
                InventoryUnitOfMeasure = n.InventoryUnitOfMeasure,
                CatalogueDescription = n.CatalogueDescription,
                BrandDescription = n.BrandDescription,
                EconomicOrderQuantity = n.EconomicOrderQuantity,
                LastYearPurchasePrice = n.LastYearPurchasePrice,
                ThisYearIssuePrice = n.ThisYearIssuePrice,
                NextYearIssuePrice = n.NextYearIssuePrice,
                Description = n.StockCommodityCode == null ? string.Empty : n.StockCommodityCode.Code + "-" + n.StockCommodityCode.Description,
            }).OrderBy(o => o.VendorNumber);

        var vendorhistoryList = Session.Query<PurchaseOrderLineItem>()
            .Where(pOpredicate)
            .Where(p => p.Stock.Number != null)
            .ToList()
            .Select(c => new
            {
                stockId = c.Id,
                LastPurchaseDate = c.PurchaseOrder.OrderDate.ToString("yyyy/MM/dd"),
                VendorNumber = c.PurchaseOrder.PurchaseOrderVendor.Vendor.Number,
                LastPurchasePrice = c.UnitPrice,
                LastTransactionDate =
                    c.LastTransactionDate != null ? c.LastTransactionDate.Value.ToString("yyyy/MM/dd") : null,
                LeadTimeDays = GetDays(c.PurchaseOrder.OrderDate, c.LastTransactionDate),
            }).GroupBy(d => d.VendorNumber).Select(gpo => gpo
                .OrderByDescending(x => x.LastPurchaseDate)
                .Take(4));

当 vendorhistoryList 对象不显示任何属性时，我的问题就从这里开始了。我在这里做错了什么？我试图在 stock.id 上将 stockDetail 与 vendorhistoryList 一起加入 1 个或多个库存行，最多 4 个最近的供应商。请建议我该怎么做？

这是我需要的最后一部分。

      var stockdetailResult = from sd in stockDetail
            join vh in vendorhistoryList on sd.Id equals vh.Id into sv
            from vs in sv.DefaultIfEmpty() ???
          .select ( c=> c.fields1....c.fields2...)

Answer 1

这是我遇到的一个非常相似的问题，所以只是回答了这个问题，这个问题也可以在这里应用。附上那个问题的link。

NHibernate LINQ 加入 2 个查询以检索最近 4 个供应商的股票

NHibernate LINQ Join 2 queries to retrieve stocks with 4 recent vendors

c#

linq

nhibernate

linq-to-sql