Question

我希望supplierCosts能够加入。目前没有记录..读取供应商成本中的零记录，但我仍然希望显示其他联接的数据。我究竟做错了什么？如果在SupplierCosts中有记录，那么它只返回数据，然后只记录该表中的记录。

 var query = (from popco in db.prcOpcoes
                 join p in db.products on popco.productID equals p.productID
                 join s in db.suppliers on popco.supplierNumber equals s.supplierNumber
                 join sc in db.SupplierCosts on new { s.supplierNumber, productId = p.productID } equals new { supplierNumber = sc.SupplierNumber, productId = sc.ProductID } into data
                 from x in data.DefaultIfEmpty()
                 where x.SupplierNumber == suppliernumber && popco.opcoID == opco 
                 select new ProductItem() { ProductID = p.productID, Description = p.division, FOB = x.FOB, Freight = x.Freight, DeliveredPrice = x.DeliveredPrice, Comments = x.Comments, Submitted = x.SubmittedDate });
    return query.ToList();

Answer 1

在发布的表达式中x被确定为SupplierCost

因此，where子句

where x.SupplierNumber == suppliernumber

将消除＆＃34;行＆＃34;如果他们没有出现在SupplierCost

请改为尝试：

where s.SupplierNumber == suppliernumber

Linq与左联合工作

1 个答案: