EF Sum 分组后的嵌套列表值

Question

所以我有一张票的列表，我想按客户对它们进行分组，然后将这些票的票务操作的所有价格相加。

            query2 = query.GroupBy(x => new {x.Customer.Id, x.Customer.BusinessName}).Select(x => new TicketStatisticsRow {
                Field = x.Key.BusinessName,
                Tickets = x.Count(),
                TotalPrice = x.Sum(t => t.TicketOperations.Sum(to => to.Price))
            });

除了尝试 TotalPrice 的总和之外，我尝试了x.SelectMany(e => e.TicketOperations).Sum(x=> x.Price) 这两种解决方案都无法在本地评估。在这种情况下，最好的方法是什么?

机票等级参考：

 public class Ticket {
        public Customer Customer { get; set; }
        public ICollection<TicketOperation> TicketOperations { get; set; }

        public class TicketOperation {
            public decimal Price { get; set; }
        }
    }

Answer 1

你会想要这样的东西

query2 = query.GroupBy(x=>x.Customer.Id).ToDictionary(x=>x.Key, x=> new 
         TicketStatisticsRow {
            Field = x.Key.BusinessName,
            Tickets = x.Count(),
            TotalPrice = x.Sum(t => t.TicketOperations.Sum(to => to.Price))
        });