向Business实体添加新属性后，WCF方法中的异常

Question

我收到异常'基础连接已关闭：访问WCF方法时，连接意外关闭，返回业务实体。在向业务实体类添加新属性后发生这种情况。当我评论新属性时，它工作正常并返回数据。我搜索了论坛，发现如果WCF方法返回的是void以外的东西，那么问题很可能与无法序列化返回值有关，而不是与底层连接有关。

Also, I have ensured that I added `[DataMember]` attribute 
above the newly added property.
        // new property added
        [DataMember]
        public bool isEmployer 
        {   get { return m_isEmployer; }
            set { m_isEmployer = value;} 
        }

// The exception comes from a class named EmpServiceProxy 
internal class EmpServiceProxy : ClientBase<IEmpService>, IEmpService
// the method is
    public MyBusinessEntity GetDetails()
        {
            return Channel.GetDetails(); // exception pops up here
           // it is not going to the factory class to call stored procedure.
        }

    // See the IEmpService class.

    [ServiceContract]
    [ServiceKnownType(typeof(ObjectListSurrogated<UserClt>))]
    [ExceptionShielding]
    [UseObjectListSurrogate]
    public interface IEmpService
    {

        [OperationContract]
        [FaultContract(typeof(MyAppFault))]
        MyBusinessEntity  GetDetails();
    }

Also, added `< dataContractSerializer maxItemsInObjectGraph="2147483646"/>` 

到配置文件。     此外，确保属性[KnownType(typeof(MyBusinessEntity))] 在继承类的业务实体之上添加。但没有任何帮助。

Any help anybody could provide would highly be appreciated.

谢谢， 拉西什