Linq到实体:向子关系添加where条件

否则

from c in mycontext.Customers.Include("Orders")
where c.Orders.Any(order => order.status == 2)
select c

或

from c in mycontext.Customers.Include("Orders")
let newObject = {
    Customer = c,
    NotPaidOrders = c.Orders.Where(order => order.status == 2).ToList()
}
where newObject.NotPaidOrders.Any()
select newObject

from c in mycontext.Customers.Include("Orders")
from order in c.Orders
where order.status == 2
select order

或者为什么不干脆这样做:

from order in mycontext.Orders
where order.status == 2
select order