Entity framework WCF&x2B；带有FK的EF返回对象

我面临以下问题：我有一个ProductOrder类，它将ProductId作为Product类的外键。当我调用以下方法时：

public IEnumerable<ProductOrder> GetOrders()
{
      return OddzialDb.ProductOrders;
}

但当它到达客户机时，发现它与产品之间没有空的关联（只包括ProductId）。在DbContext中，我设置了

   base.Configuration.ProxyCreationEnabled = false;
   base.Configuration.LazyLoadingEnabled = false;

在由EF ProductOrder类自动生成的WCF服务端上，如下所示：

 public partial class ProductOrder
    {
        public int Id { get; set; }
        public Nullable<int> ProductId { get; set; }
        public int Quantity { get; set; }

        public virtual Product Product { get; set; }
    }

公共部分类ProductOrder
{
公共int Id{get；set；}
公共可为空的ProductId{get；set；}
公共整数数量{get；set；}
公共虚拟产品产品{get；set；}
}

---

如果它断开与外键关联的表的连接，会发生什么情况？

使您的关系成为虚拟关系，如示例所示：

public class ProductOrder
{
    public int Id { get; set; }
    public virtual Product Product { get; set; }
    public int ProductId { get; set; }
}

通过将关系变为虚拟关系，实体框架将生成

ProductOrder

类的代理，该代理将包含

产品的引用

为确保其正常工作，
产品
还必须包含对
产品订单
的引用：

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection<ProductOrder> ProductOrders { get; set; }
}

在您的WCF应用程序上，添加以下类，该类将允许代理序列化：

public class ApplyDataContractResolverAttribute : Attribute, IOperationBehavior
{
    public ApplyDataContractResolverAttribute()
    {
    }

    public void AddBindingParameters(OperationDescription description, BindingParameterCollection parameters)
    {
    }

    public void ApplyClientBehavior(OperationDescription description, System.ServiceModel.Dispatcher.ClientOperation proxy)
    {
        DataContractSerializerOperationBehavior dataContractSerializerOperationBehavior =
            description.Behaviors.Find<DataContractSerializerOperationBehavior>();
        dataContractSerializerOperationBehavior.DataContractResolver =
            new ProxyDataContractResolver();
    }

    public void ApplyDispatchBehavior(OperationDescription description, System.ServiceModel.Dispatcher.DispatchOperation dispatch)
    {
        DataContractSerializerOperationBehavior dataContractSerializerOperationBehavior =
            description.Behaviors.Find<DataContractSerializerOperationBehavior>();
        dataContractSerializerOperationBehavior.DataContractResolver =
            new ProxyDataContractResolver();
    }

    public void Validate(OperationDescription description)
    {
        // Do validation.
    }
}

尝试OddzialDb.ProductOrders.Include（po=>po.Product.First（）.Product.Name；我得到循环引用。您可能需要在序列化之前投影结果。我已经尝试过包含，在这种情况下，我收到循环引用错误。当客户端使用WCF服务时，它会自动生成类，如Product等。使用
WCF
，使用第二种方法会更好。我自己从来没有让它以另一种方式正常工作。就EF的WCF服务而言，Product和ProductOrders都使用虚拟关键字相互引用。但是，只要您使用延迟加载并使所有关系完全可
序列化
，它将只通过网络发送所有关系。我已更改为base.Configuration.LazyLoadingEnabled=true。没有发现好转。
Configuration.LazyLoadingEnabled = true;
Configuration.ProxyCreationEnabled = true;

public class ApplyDataContractResolverAttribute : Attribute, IOperationBehavior
{
    public ApplyDataContractResolverAttribute()
    {
    }

    public void AddBindingParameters(OperationDescription description, BindingParameterCollection parameters)
    {
    }

    public void ApplyClientBehavior(OperationDescription description, System.ServiceModel.Dispatcher.ClientOperation proxy)
    {
        DataContractSerializerOperationBehavior dataContractSerializerOperationBehavior =
            description.Behaviors.Find<DataContractSerializerOperationBehavior>();
        dataContractSerializerOperationBehavior.DataContractResolver =
            new ProxyDataContractResolver();
    }

    public void ApplyDispatchBehavior(OperationDescription description, System.ServiceModel.Dispatcher.DispatchOperation dispatch)
    {
        DataContractSerializerOperationBehavior dataContractSerializerOperationBehavior =
            description.Behaviors.Find<DataContractSerializerOperationBehavior>();
        dataContractSerializerOperationBehavior.DataContractResolver =
            new ProxyDataContractResolver();
    }

    public void Validate(OperationDescription description)
    {
        // Do validation.
    }
}

[OperationContract]
[ApplyDataContractResolver]
[FaultContract(typeof(AtcWcfEntryNotFoundException))]
Case GetSingleByCaseNumber(int number);