假设我有这个参考设置
public class Account
{
Guid ID {get;set;}
string name {get;set}
}
public class Order
{
Guid ID {get;set;}
}
public class AccountOrder
{
Guid ID {get;set}
Guid AccountID {get;set}
Guid OrderID {get;set}
}
Now when I want to model this setup as so:
public class AccountOrderModel
{
//One account with many orders
string name {get;set}
List<Order>orders {get;set;}
}
我想使用Linq根据帐户订单参考获取包含所有订单的1个帐户。
答案 0 :(得分:4)
我之前发布的代码不是正确的左外连接..如果没有关联订单,它将无法返回帐户。在此代码中已修复:
var aom = from a in accounts
join ao in accountorders on a.ID equals ao.AccountID into aoGroup
from aod in aoGroup.DefaultIfEmpty(new AccountOrder())
join o in orders on aod.OrderID equals o.ID into oGroup
group oGroup by a into g
select new AccountOrderModel() { Name = g.Key.Name, orders = g.SelectMany(x => x).ToList() };
它已经过测试,我认为我终于弄清楚了。