Linq嵌套关系和DTO

Question

我正在从Oracle数据库获取数据并创建供内部使用的API。一些类（为简洁起见，简称：）>

CustomerOrderTab

    Public partial class CustomerOrderTab
    Public string OrderNo { get; set; }
    [ForeignKey("CustomerMV")]
    public string CustomerNo { get; set; }
    public List<CustomerOrderLineTab> CustomerOrderLines { get; set; }
    public List<CustomerOrderChargeTab> CustomerOrderCharge { get; set; }
    public List<ShipmentOrderLineTab> ShipmentOrderLines { get; set; }
    public CustomerMV CustomerMV { get; set; }
CustomerOrderDTO

    Public class OrderDTO
    public string OrderNo { get; set; }
    public string CustomerName { get; set; }
    public List<OrderLinesDTO> OrderLines { get; set; }
    public List<OrderChargesDTO> OrderCharges { get; set; }
    public List<ShipmentOrderLinesDTO> ShipmentOrderLines { get; set; }
ShipmentOrderLineTab

    public partial class ShipmentOrderLineTab
    public decimal ShipmentId { get; set; }
    [ForeignKey("CustomerOrderTab")]
    public string OrderNo { get; set; }
    public ShipmentTab Shipment { get; set; }
ShipmentOrderLineDTO

    public class ShipmentOrderLinesDTO
    public decimal ShipmentId { get; set; }
    public string OrderNo { get; set; }
    public ShipmentTab MyShipment { get; set; }
ShipmentTab

    public partial class ShipmentTab
    [ForeignKey("ShipmentOrderLineTab")]
    public decimal ShipmentId { get; set; }
    public string ShipperAddress1 { get; set; }
    public string ShipperAddress2 { get; set; }
    public List<ShipmentHandlingUnitTab> ShipmentHandlingUnits { get; set; }
ShipmentDTO

    public class ShipmentDTO
    public decimal ShipmentId { get; set; }
    public string ShipViaCode { get; set; }
    public string ShipmentPayer { get; set; }
    public List<ShipmentHandlingUnitDTO> ShipmentHandlingUnitDTOs { get; set; }
此作品：

    var orderLines = from o in _context.CustomerOrderTab
                         .Where(o => o.OrderNo == orderno)
                         select new OrderDTO()
                         {
                             OrderNo = o.OrderNo,
                             CustomerName = o.CustomerMV.CustomerName,

    This is a child of the order     ShipmentOrderLines = o.ShipmentOrderLines
    This works          .Select(ob => new ShipmentOrderLinesDTO
                             {
                                 ShipmentId = ob.ShipmentId,
                                 OrderNo = ob.OrderNo,
                                 MyShipment = ob.Shipment
    Adding this does not work         .Select(y => new ShipmentDTO
    The error says that ShipmentTab
     Doesn’t have a definition for Select    {
                                        }
                             }).ToList()
货件是ShipmentOrderLine的子项（每行只有一个货件）

[ShipmentOrderLine是CustomerOrder的子项（每个订单可以有很多行）

我认为问题在于，每条线只装一批，但是我尝试了很多事情，无法将其映射到我的DTO。

我正在从Oracle数据库获取数据并创建供内部使用的API。其中一些类（为简洁起见已缩短）：CustomerOrderTab公共局部类CustomerOrderTab Public ...

Answer 1

修复您的模型：