调用WCF方法时，Navigation属性为null

Question

我有以下代码，如下所示：

1. 数据 - DbContext数据库访问。
2. 实体 - 使用INotifyPropertyChanged的POCO实体
3. WCF服务 - 使用数据和实体
4. 测试库

以下是测试方法的代码。

        SalesOrder order = new SalesOrder();
        order.CustomerID = 1;
        order.OrderDate = DateTime.Now;
        order.SalesTax = 5.60M;
        order.ShipCharge = 5.00M;
        order.DiscountPercent = 20;
        order.ModifiedByUser = Environment.UserName;
        order.CreatedByUser = Environment.UserName;

        SalesOrderDetail detail = new SalesOrderDetail();
        detail.SalesOrder = order;
        detail.OrderID = order.OrderID;
        detail.OrderQuantity = 15;
        detail.UnitPrice = 20;
        detail.Description = "Test";
        detail.ModifiedByUser = Environment.UserName;
        detail.CreatedByUser = Environment.UserName;
        order.SalesOrderDetails.Add(detail);

        order = _service.SaveOrder(order);

order.SalesOrderDetails目前有一个项目。但是当它到达WCF方法时，order.SalesOrderDetails的计数为0。

这是我的SalesOrder类和SalesOrderDetail类

public partial class SalesOrder: EntityBase
{

    public SalesOrder()
    {
        this.SalesOrderDetails = new BindingList<SalesOrderDetail>();
        ((BindingList<SalesOrderDetail>)SalesOrderDetails).ListChanged += SalesOrder_ListChanged;
    }

    .... other properties

    [DataMember]
    public ICollection SalesOrderDetail{get; set;}
}

public partial class SalesOrderDetail : EntityBase
{

    .... other properties

    [DataMember]
    public SalesOrder SalesOrder{get; set;}
}

我的实体基地

[DataContract(IsReference = true)]
public class EntityBase:IAuditable, INotifyPropertyChanged
{
   .... IAuditable, INotify members
}

我的WCF方法

    public SalesOrder SaveOrder(SalesOrder order) // At this point order.SalesOrderDetails count is 0.
    {
        if (order.OrderID == 0)
            AddSalesOrder(order);
        else
            UpdateSalesOrder(order);

        return order;
    }

我在这里缺少什么？谢谢你的帮助！

Answer 1

我通过将[DataContract（IsReference = true）]添加到公共部分类SalesOrder来修复它：EntityBase和公共部分类SalesOrderDetail：EntityBase。不确定它是如何产生影响的。但这解决了我的问题。