在WCF客户端和服务器中使用相同的类

我刚刚在学习wfc，有一个问题。我有写作测试课程：

[DataContract(IsReference = true)]
public class TestClass
{
    [DataMember]
    public TestKind Kind { set; get; }
    [DataMember]
    public List<TestClass> Childs { set; get; }
    [DataMember]
    public TestClass Parent { set; get; }
    [DataMember]
    public string Id { set; get; }
    [DataMember]
    public int Value { set; get; }
    public TestClass()
    {
        Childs = new List<TestClass>();
    }
}
[DataContract(IsReference = true)]
public class TestKind
{
    [DataMember]
    public int Id { set; get; }
}

种类存储在缓存中，需要从中加载。目标是在WFC客户端和服务器中使用此类。服务器上没有问题。它很容易启动，并且只有一个方法返回TestClass:的列表

AutoResetEvent infinity = new AutoResetEvent(false);
Uri baseAddress = new Uri("http://localhost:8989/test");
using (ServiceHost host = new ServiceHost(typeof(MyRemote), baseAddress))
{
    ServiceMetadataBehavior smb = new ServiceMetadataBehavior
    {
        HttpGetEnabled = true,
        MetadataExporter =
        {
            PolicyVersion = PolicyVersion.Default
        }
    };
    host.Description.Behaviors.Add(smb);
    host.Open();
    infinity.WaitOne();
}

服务器实现代码：

[ServiceContract(Name = "testSvc")]
public interface IRemote
{
    [OperationContract]
    List<TestClass> GetAll();
}
public class Remote : IRemote
{
    public List<TestClass> GetAll()
    {
        return Program.classes;
    }
}

但后来我尝试在客户端添加对它的引用，VS创建了一个新的TestClass类，该类具有如下字段：

...
[System.Runtime.Serialization.OptionalFieldAttribute()]
private string IdField;
[System.Runtime.Serialization.OptionalFieldAttribute()]
private ConsoleApplication7.ServiceReference1.TestKind KindField;
[System.Runtime.Serialization.OptionalFieldAttribute()]
private ConsoleApplication7.ServiceReference1.TestClass ParentField;
...

所以问题是如何对客户端进行编码以连接到服务器并获得TestClass实体的列表（不要生成其他类）。是否可以扩展TestClass？或者其他方法在哪里？

[ServiceContract(Name = "testSvc")]
[KnownType(typeof(TestClass))]
public interface IRemote