状态EndRootElement中的Token EndElement将导致无效的XML文档

Question

我正在为wp7.i开发一个应用程序。我正在使用datacontractserializer将我的应用程序状态存储在isolatedstoragefile中。当我尝试序列化对象时 有时我会遇到这个例外。

  

状态EndRootElement中的Token EndElement将导致无效   XML文档。确保将ConformanceLevel设置设置为   如果您愿意，可以使用ConformanceLevel.Fragment或ConformanceLevel.Auto   写一个XML片段。

这是我正在序列化的课程

[DataContract]
public class TcpSessionProperties
{
  [DataMember]
    public int NumberOfReceivedStanzas { get { return _numberOfReceivedStanzas; } set { _numberOfReceivedStanzas = value; } }

    [DataMember]
    public int NumberOfPacketsSent { get { return _numberOfPacketsSent; } set { _numberOfPacketsSent = value; } }


    [DataMember]
    public List<TcpPacket> PendingPacketsToSendQueue
    {
        get { return _pendinPacketsToSendQueue; }
        set
        {
            LogUtility.Log(Thread.CurrentThread.GetHashCode());
            _pendinPacketsToSendQueue = value;
        }
    }

}

cla

这是我的序列化和反序列化的代码

public class AppCacheIsolatedFile
{
    public static void Add(object val)
    {
      private static object _objectToSave;

        lock (_storageLock)
        {
            /*
            if (PhoneApplicationService.Current.State.ContainsKey(key))
                PhoneApplicationService.Current.State[key] = val;
            else
                PhoneApplicationService.Current.State.Add(key, val);
             */
            _objectToSave = val;
            WriteObject(NameOfFile, val, typeof(StreamingSocketConnection.StreamingSocketConnection));
        }
         public static void WriteObject(string fileName,object val,Type type)
    {
        try
        {
            Console.WriteLine(
            "Creating a Person object and serializing it.");

            using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(fileName, FileMode.Create, IsoStore))
            {
                DataContractSerializer dcs = new DataContractSerializer(type);
                dcs.WriteObject(stream, val);
            }
        }
        catch (Exception exception)
        {

            LogUtility.NotifyUserAndLog("Exception occured in isolatd storage file  while writing "+exception.StackTrace); 
        }


    }


    }

该异常发生在dcs.writeobject上。我不知道为什么会这样。