[英]Linq complex object groupBy
I have fairly simple structure: 我的结构很简单:
Each Customer has his WeeklyOrder . 每个客户都有他的WeeklyOrder 。
WeeklyOrder consists of 5 DailyOrders and WeeklyOrder由5个DailyOrders和
in each DailyOrder are 5 OrderItems with ItemType (one of 5 slots basically) and Count . 每个DailyOrder中的5个OrderItems具有ItemType (基本上是5个广告位之一)和Count 。
I want to get counts for this week. 我想得到这个星期的计数。 So I get all DailyOrders from all users for this week.
因此,我本周从所有用户那里获得了所有DailyOrders 。
var orders = db
.WeeklyOrders
.Where(x => x.WeekNumber == week && x.Year == year)
.SelectMany(x => x.DailyOrders);
Everything works fine, but now i don't know how to group daily orders by DailyOrder.DayNumber and how to group items in each DailyOrder (not all together, for each daily order separately) so i know the sum from all users - how many items of type 1 were ordered for Monday how many for Tuesday etc. 一切正常,但现在我不知道如何按DailyOrder.DayNumber对每日订单进行分组,以及如何对每个DailyOrder中的项目进行分组(不是全部在一起,分别针对每个每日订单),所以我知道所有用户的总和-多少类型1的项目在星期一订购了多少,在星期二订购了多少,等等。
I am asking only for the correct linq query. 我只要求正确的linq查询。
To give you and idea of what I want to get in my view: 让您了解我想获得的观点:
Monday 星期一
Tuesday 星期二
... ...
etc. 等等
Here is my model: 这是我的模型:
public class WeeklyOrder
{
public int WeeklyOrderId { get; set; }
public int UserId { get; set; }
public int Year { get; set; }
public int WeekNumber { get; set; }
public virtual Customer Customer { get; set; }
public virtual List<DailyOrder> DailyOrders { get; set; }
}
public class DailyOrder
{
public int DailyOrderId { get; set; }
public int DayNumber { get; set; }
public int WeeklyOrderId { get; set; }
public virtual WeeklyOrder WeeklyOrder { get; set; }
public virtual List<OrderItem> OrderItems { get; set; }
}
public class OrderItem
{
public int OrderItemId { get; set; }
public int Count { get; set; }
public int ItemTypeId { get; set; }
public int DailyOrderId { get; set; }
public virtual DailyOrder DailyOrder { get; set; }
public virtual ItemType Type { get; set; }
}
Try this: 尝试这个:
var orders = db
.WeeklyOrders
.Where(x => x.WeekNumber == week && x.Year == year)
.SelectMany(x => x.DailyOrders.SelectMany(y => y.OrderItems))
.GroupBy(a => new
{
DayNumber = a.DailyOrder.DayNumber,
Type = a.Type
})
.Select(a => new
{
DayNumber = a.Key.DayNumber,
Type = a.Key.Type,
Total = a.Sum(b => b.Count)
});
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