Question

如何在linq中编写此查询？

select * from bills as b inner join customer as c1
          On b.shipperID=c1.CustomerID inner join customer c2
          On b.ConsigneeID=c2.CustomerID      
---------------------------

我需要如下所示：

var result=from p1 in entities.bills
           join p2 in entities.customer on p1.shipperID equals p2.customerID
           join p3 in entities.customer on p1.consigneeID equals p3.customerID
           select p2;
           return resuls.Tolist()

感谢：）

Answer 1

在你的SQL中你选择所有这些，所以在linq中你需要将所有对象放在你的新匿名类型中，如下所示。

var result = from p1 in entities.bills
             join p2 in entities.customer on p1.shipperID equals p2.customerID
             join p3 in entities.customer on p1.consigneeID equals p3.customerID
             select new 
                 { 
                     Bills = p1,
                     Shippers = p2,
                     Consignees = p3
                 };

             return resuls.Tolist();

或者如果你需要将它们弄平，你将不得不按属性投射它们。

你应该在LINQ中使用导航属性，比如

from bills in entities.bills
select new
{
    bills.Shipper
    bills.Consignee
};

Linq多次加入同一个表

1 个答案: