在WCF中保存对象引用的问题

我试图确保在WCF上序列化时保留我的对象引用，但是我覆盖的DataContractSerializerOperationBehavior上的CreateSerializer永远不会被调用。有谁能帮我一下吗?

这是我的代码:

自定义DataContractSerializerOperationBehavior:

public class ObjectGraphDataContractSerializerBehavior : DataContractSerializerOperationBehavior
{
    /// <summary>
    /// Initializes a new instance of the <see cref="ObjectGraphDataContractSerializerBehavior"/> class.
    /// </summary>
    /// <param name="operationDescription">The operation description.</param>
    public ObjectGraphDataContractSerializerBehavior(OperationDescription operationDescription)
        : base(operationDescription)
    {
    }
    public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList<Type> knownTypes)
    {
        return new DataContractSerializer(type, name, ns, knownTypes,
            int.MaxValue /*maxItemsInObjectGraph*/,
            false/*ignoreExtensionDataObject*/,
            true/*preserveObjectReferences*/,
            null/*dataContractSurrogate*/);
    }
    public override XmlObjectSerializer CreateSerializer(Type type, XmlDictionaryString name, XmlDictionaryString ns, IList<Type> knownTypes)
    {
        return new DataContractSerializer(type, name, ns, knownTypes,
            int.MaxValue /*maxItemsInObjectGraph*/,
            false/*ignoreExtensionDataObject*/,
            true/*preserveObjectReferences*/,
            null/*dataContractSurrogate*/);
    }

    public static void SetDataContractSerializerBehavior(ContractDescription contractDescription)
    {
        foreach (OperationDescription operation in contractDescription.Operations)
        {
            operation.Behaviors.Add(new ObjectGraphDataContractSerializerBehavior(operation));
        }
    }
}

启动服务主机:

    var serviceHost = new ServiceHost(typeof (Service));
    serviceHost.AddServiceEndpoint(typeof (IService), new NetTcpBinding(), DummyUrl);
    foreach (var endpoint in serviceHost.Description.Endpoints)
        ObjectGraphDataContractSerializerBehavior.SetDataContractSerializerBehavior(endpoint.Contract);
    serviceHost.Open();

创建频道:

m_ChannelFactory = new ChannelFactory<IService>(m_Binding, new EndpointAddress(m_Url));
ObjectGraphDataContractSerializerBehavior.SetDataContractSerializerBehavior(m_ChannelFactory.Endpoint.Contract);
foreach (var behavior in endpointBehaviors)
    m_ChannelFactory.Endpoint.Behaviors.Add(behavior);

public static void SetDataContractSerializerBehavior(ContractDescription contractDescription)
{
    foreach (OperationDescription operation in contractDescription.Operations)
    {
         DataContractSerializerOperationBehavior dcsob = operation.Behaviors.Find<DataContractSerializerOperationBehavior>();
         if (dcsob != null)
         {
            operation.Behaviors.Remove(dcsob);
         }
         operation.Behaviors.Add(new     ReferencePreservingDataContractSerializerOperationBehavior(operation));
    }
}