c# - 状态为 EndRootElement 的令牌 EndElement 将导致无效的 XML 文档

Question

我正在为 wp7 开发应用程序。我正在使用 datacontractserializer 将应用程序的状态存储在隔离的存储文件中。现在，当我尝试序列化对象时，有时我会遇到此异常。

处于 EndRootElement 状态的令牌 EndElement 将导致无效的 XML 文档。如果要编写 XML 片段，请确保将 ConformanceLevel 设置设置为 ConformanceLevel.Fragment 或 ConformanceLevel.Auto。

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

这是我正在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。我不知道为什么会这样。