WCF双工服务 - 序列化异常

这是我的Client类

using System;
using System.Data;
using System.ServiceModel;
using System.Runtime.Serialization;

namespace Main.Communication
{
    public delegate void EventReceivedEventHandler(DataSet InBoxNotifications, bool updateOutBoxFlag);
    public delegate void OpenConnectEventHandler(int spaceId, string accessionNumber, string modality, long assignedCaseId, long originalCaseId);
    [DataContract]
    public class ClientClass : IClient, IDisposable
    {
        public event EventReceivedEventHandler EventReceived;
        public event OpenConnectEventHandler OpenConnectSystem;

        public ClientClass(int userId)
        {
            this.UserId = userId;
            this.Authentication = Guid.NewGuid().ToString();
        }

        private string _authentication;
        [DataMember]
        public string Authentication
        {
            get { return _authentication; }
            set { _authentication = value; }
        }

        private int _userId;
        [DataMember]
        public int UserId
        {
            set { _userId = value; }
            get { return _userId; }
        }

        #region "IClient Members"
        public bool UpdateInDataBox(DataSet InBoxNotifications, bool updateOutBoxFlag)
        {
            if (EventReceived != null) EventReceived(InBoxNotifications, updateOutBoxFlag);
            return true;
        }
        public void OpenReviewPanel(int spaceId, string accessionNumber, string modality, long assignedCaseId, long originalCaseId)
        {
            if (OpenConnectSystem != null) OpenConnectSystem(spaceId, accessionNumber, modality, assignedCaseId, originalCaseId);
        }
        #endregion

        #region IDisposable Members
        public void Dispose()
        {
            ((ICommunicationObject)this).Abort();
        }
        #endregion
    }
}

IClient 是 Callback . 我正在使用 netTcp 绑定 . 将此对象传递给Server方法时，我收到这样的错误，

尝试序列化参数http://tempuri.org/:observer时出错 . InnerException消息是'Type'Main.Communication.ClientClass'，数据协定名称为“CommunicationClient：http：//schemas.datacontract.org/2004/07/Main.Communication.ClientClass”，不是预期的 . 将任何静态未知的类型添加到已知类型列表中 - 例如，通过使用KnownTypeAttribute属性或将它们添加到传递给DataContractSerializer的已知类型列表中 . 有关更多详细信息，请参阅InnerException .