導航屬性爲空，而調用WCF方法

Question

我有以下的代碼，該代碼如下分層：

1. 數據 - 的DbContext數據庫訪問。
2. 實體 - 與INotifyPropertyChanged的
3. WCF服務POCO實體 - 使用數據和實體
4. 測試庫

下面是測試方法的代碼。

 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此時有一個項目。但是，當它到達WCF方法，order.SalesOrderDetails具有0

這裏計數是我SalesOrder類的SalesOrderDetail類

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EntityBase

[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; 
    } 

我在這裏錯過了什麼？謝謝你的幫助！

Answer 1

我通過向公共部分類SalesOrder：EntityBase和公共部分類SalesOrderDetail：EntityBase添加[DataContract（IsReference = true）]來修復它。不知道它是如何有所作爲。但是這解決了我的問題。