如何在linq中连接多列的表？

Question

我在linq中有以下代码，我想要做的是连接一个表的多列的表

//NOT A VALID CODE
from t1 in table1
join t2 in table2 on ((t1.ID equals t2.orderId) || (t1.ID equals t2.pickupId ))// how can I do this
...
...

我如何在Linq中实现这一目标？

Answer 1

使用匿名类型

from t1 in table1
join t2 in table2 on new { t1.ID, t1.pickupId } equals new { t2.ID, t2.pickupId }
...

Answer 2

var query = from t1 in table1
            from t2 in table2
            where t1.ID == t2.orderId || t1.ID == t2.pickupId
            select new { t1, t2};