我想列出linq查询中的金额
我的代码是
public List<OrderMaster> GetAmountByOrder(int orderId)
{
var amount = from om in _db.OrderMa
join od in _db.Order on om.OrderId equals od.OrderId
where om.OrderId == od.OrderId && om.PaymentStatus == false
select om.Amount;
return amount.ToList();
}
amount.ToList(); error is showing.
那样的{p> cannot implicitly convert type double to list.....
......
如何解决这个问题?
答案 0 :(得分:3)
您正在声明返回List<OrderMaster>
的方法,但您正在返回List<double>
。此外,连接已经等同于OrderIds
,无需在其中重复。我认为这是一个错误,因为它应该是方法参数的orderId
。此外,您想要列出金额或所有内容的总和吗?如果总和则使用Sum
而不是ToList
,只返回double
。
public List<double> GetAmountByOrder(int orderId)
{
var amount = from om in _db.OrderMa
join od in _db.Order on om.OrderId equals od.OrderId
where om.OderId = orderId && om.PaymentStatus == false
select om.Amount;
return amount.ToList();
}
答案 1 :(得分:0)
public List<OrderMaster> GetAmountByOrder(int orderId)
{
var omCollection = from om in _db.OrderMa
join od in _db.Order on om.OrderId equals od.OrderId
where om.OrderId == od.OrderId && om.PaymentStatus == false
select om;
return omCollection.ToList();
}