C# 更改存储库中的相关数据

有两个实体Order和OrderDetail，它们以这种方式绑定：

public partial class Order
{ 
    public Order()
    { 
        OrderDetails = new List<OrderDetail>();
    }
    ...
}
public class OrderDetail
{
    public long OrderDetailId { get; set; }
    public int OrderId { get; set; }

    [DefaultValue(0)]
    public int RowNumber { get; set; }
    [ForeignKey("Product")]
    public int ProductId { get; set; }
    public int Count { get; set; }
    public decimal Price { get; set; }
    [ForeignKey("ProductId")]
    public virtual Product Product { get; set; }
    public virtual Order Order { get; set; }
}

---

该解决方案是实体OrderDetails中的一个键，（删除OrderDetailId并将OrderId和RowNumber设置为主复合键（感谢一名男子暗示，但他的帖子已被主持人删除）

而不是执行以下代码更改数据和删除不必要的OrderDetails

 public Order ChangeOrderSimple(Guid guid, IEnumerable<JsonModelItem> items, string Comments, bool isReserve, DateTime? DeliveryDate = null)
        {
            decimal total = 0;
            int row = 1;
            Dictionary<int, int> codes = items.ToDictionary(p => p.ProductId,p=>p.Count);
            var OrderToChange = _orders.GetAll(q => q.GuidIn1S == guid).Include(o => o.OrderDetails).FirstOrDefault();
            OrderToChange.Comments = Comments;
            OrderToChange.isReserve = isReserve;
            OrderToChange.DeliveryDate = DeliveryDate;


            var OrderDetails = OrderToChange.OrderDetails.ToList();

            List<OrderDetail> OrderDetailsChanged = new List<OrderDetail>();

            for (int i = 0; i < OrderDetails.Count; i++)
            {
                var item = OrderDetails[i];
                //    item = OrderD.OrderDetails[i];
                var result = codes.ContainsKey(item.ProductId);


                if (result)
                {
                    OrderDetail detail = new OrderDetail
                    {
                        RowNumber = ++row,
                        ProductId = item.ProductId,
                        Count = codes[item.ProductId],
                        Price = item.Price,
                        OrderId = item.OrderId
                    };
                    OrderDetailsChanged.Add(detail);
                }
            }

            OrderToChange.OrderDetails = OrderDetailsChanged;
            OrderToChange.CalculateTotal();

            _orders.Update(OrderToChange);
            return OrderToChange;
        }

公共订单ChangeOrderSimple（Guid、IEnumerable项、字符串注释、bool isReserve、DateTime？DeliveryDate=null） { 小数总数=0； int行=1； 字典代码=items.ToDictionary（p=>p.ProductId，p=>p.Count）； var OrderToChange=\u orders.GetAll（q=>q.GuidIn1S==guid）.Include（o=>o.OrderDetails.FirstOrDefault（）； OrderToChange.Comments=注释； OrderToChange.isReserve=isReserve； OrderToChange.DeliveryDate=交货日期； var OrderDetails=OrderToChange.OrderDetails.ToList（）； List OrderDetailsChanged=新列表（）； for（int i=0；i取决于

IRepository

的实现。您的意思是在T上没有更多的条件，或者没有更多的方法签名，比如

RemoveChild（Int32 childRank）

？我的意思是从存储库中获取和更新订单（及其订单详细信息），然后将其放入数据库（没有直接到DbContext的地址）

var OrderToChange=_orders.GetAll（-）；List orderDetails=new List（）；int row_num=0；foreach（代码中的KeyValuePair对）{row_num++；orderDetails.Add（new orderDetails{ProductId=pair.Key，Count=pair.Value，Price=100，rownumer=row_num，OrderId=OrderToChange.OrderId}）；}OrderToChange.OrderDetails=OrderDetails；_orders.Update（OrderToChange）；

public class OrderDetail
    {
      //  public long OrderDetailId { get; set; }

         [Key, Column(Order = 1)]
        public int OrderId { get; set; }

        [Key, Column(Order = 2)]
        public int RowNumber { get; set; }

        [ForeignKey("Product")]
        public int ProductId { get; set; }
        public int Count { get; set; }
        public decimal Price { get; set; }
        [ForeignKey("ProductId")]
        public virtual Product Product { get; set; }
        public virtual Order Order { get; set; }

    }

 public Order ChangeOrderSimple(Guid guid, IEnumerable<JsonModelItem> items, string Comments, bool isReserve, DateTime? DeliveryDate = null)
        {
            decimal total = 0;
            int row = 1;
            Dictionary<int, int> codes = items.ToDictionary(p => p.ProductId,p=>p.Count);
            var OrderToChange = _orders.GetAll(q => q.GuidIn1S == guid).Include(o => o.OrderDetails).FirstOrDefault();
            OrderToChange.Comments = Comments;
            OrderToChange.isReserve = isReserve;
            OrderToChange.DeliveryDate = DeliveryDate;


            var OrderDetails = OrderToChange.OrderDetails.ToList();

            List<OrderDetail> OrderDetailsChanged = new List<OrderDetail>();

            for (int i = 0; i < OrderDetails.Count; i++)
            {
                var item = OrderDetails[i];
                //    item = OrderD.OrderDetails[i];
                var result = codes.ContainsKey(item.ProductId);


                if (result)
                {
                    OrderDetail detail = new OrderDetail
                    {
                        RowNumber = ++row,
                        ProductId = item.ProductId,
                        Count = codes[item.ProductId],
                        Price = item.Price,
                        OrderId = item.OrderId
                    };
                    OrderDetailsChanged.Add(detail);
                }
            }

            OrderToChange.OrderDetails = OrderDetailsChanged;
            OrderToChange.CalculateTotal();

            _orders.Update(OrderToChange);
            return OrderToChange;
        }