对旧的复杂类型使用WCF

我正在编写一个WCF服务来替换当前的Web服务,并且我在处理一个需要返回的遗留复杂类型时遇到了问题。

不幸的是,我不能接触到任何代码,但是看看它们,所有的类都是可序列化的,当前的Web服务正在毫无问题地使用它。

每当我的客户机调用WCF服务时,它会收到一个通信异常,当我打开WCF跟踪时,我发现以下序列化错误:

键入“common.permission.applicationgroup”(数据协定名称) 应用程序组 : http://schemas.datacontract.org/2004/07/Common.Permission 不应为“”。将静态未知的任何类型添加到已知类型列表中-例如,使用knownTypeAttribute属性或将其添加到传递给DataContractSerializer的已知类型列表中。

我要返回的类型是applicationPrincipal,但它似乎是属于子类型的。这些类的外观如下:

我要返回的类型:

[Serializable]
[TypeConverter(typeof(ExpandableObjectConverter))]
public class ApplicationPrincipal : 
    IPrincipal, ISupportInitialize, IDeserializationCallback, IFormattable
{
    private ApplicationIdentity m_identity;
    private ApplicationGroupCollection m_groups;
    private ConditionDictionary m_roleConditions;

下面是ApplicationGroupCollection:

[Serializable]
public class ApplicationGroupCollection : 
    IList, IEnumerable, IFormattable, ISupportInitialize, 
    IDeserializationCallback, ICloneable, ICustomTypeDescriptor
{
    /// <summary>
    /// Occurs when a value is being changed in the collection.
    /// </summary>
    [field:NonSerialized]
    public event CollectionChangeEventHandler CollectionChanging;

    /// <summary>
    /// Occurs when a value has been changed in the collection.
    /// </summary>
    [field:NonSerialized]
    public event CollectionChangeEventHandler CollectionChanged;

最后,应用程序组:

[Serializable]
[TypeConverter(typeof(ExpandableObjectConverter))]
public class ApplicationGroup : 
    ICloneable, ISupportInitialize, IDeserializationCallback, IFormattable
{
    private int m_groupID;
    private string m_groupName;
    private string m_groupDesc;
    private ConditionDictionary m_roleConditions;

关于为什么wcf不能序列化applicationgroup有什么建议吗?