"源数据中的无效字段:0"错误与ProtoBuf-Net和Compact Framework

Question

当使用ProtoBuf-Net在紧凑框架和完整的.Net框架之间进行序列化/反序列化时,是否有人知道任何问题？我有一个名为LogData的类,我在紧凑框架3.5下序列化,传输到服务器(运行.Net framework 4.0),然后反序列化.有时它会起作用,有时它会引发上述错误,我还没有将其缩小到任何特定原因.我已经用不同的值做了很多测试,并且在发生错误时似乎找不到任何押韵或理由.我在下面包括我的课程(减去各种构造函数).我已多次查看任一侧的字节缓冲区,但尚未发现通过线路从一侧传输到另一侧的数据存在差异.

[ProtoContract]
public class LogData
{

  [ProtoContract]
  public enum LogSeverity
  {
     [ProtoEnum(Name = "Information", Value = 0)]
     Information,
     [ProtoEnum(Name = "Warning", Value = 1)]
     Warning,
     [ProtoEnum(Name = "Error", Value = 2)]
     Error,
     [ProtoEnum(Name = "Critical", Value = 3)]
     Critical
  }

  [ProtoMember(1)]
  public string UserID { get; set; }
  [ProtoMember(2)]
  public string ComputerName { get; set; }
  [ProtoMember(3)]
  public ExceptionProxy Exception { get; set; }
  [ProtoMember(4)]
  public LogData.LogSeverity Severity { get; set; }
  [ProtoMember(5)]
  public string Source { get; set; }
  [ProtoMember(6)]
  public string Caption { get; set; }
  [ProtoMember(7)]
  public string Description { get; set; }
  [ProtoMember(8)]
  public DateTime TimeOfOccurrence { get; set; }
  [ProtoMember(9)]
  public Guid SessionID { get; set; }
  [ProtoMember(10)]
  public string MethodName { get; set; }
  [ProtoMember(11)]
  public string OSVersion { get; set; }
  [ProtoMember(12)]
  public string Category { get; set; }
  [ProtoMember(13)]
  public string Location { get; set; }
}

[ProtoContract]
public class ExceptionProxy
{

  [ProtoMember(1)]
  public Type ExceptionType { get; set; }
  [ProtoMember(2)]
  public string Message { get; set; }
  [ProtoMember(3)]
  public string StackTrace { get; set; }
  [ProtoMember(4)]
  public ExceptionProxy InnerException { get; set; }

}

这是我执行序列化和发送的代码

  private void WriteLogDataToServer(LogData data)
  {
     using (var client = new TcpClient())
     {
        client.Connect(Host, SignalLineServerPort);
        using (var stream = client.GetStream())
        {
           using (var ms = new MemoryStream())
           {
              Serializer.Serialize<LogData>(ms, data);
              var buffer = ms.GetBuffer();
              int position = 0;
              WriteFrameMarkers(stream);
              byte[] frameLengthBuffer = BitConverter.GetBytes(buffer.Length);
              stream.Write(frameLengthBuffer, 0, IntByteSize);
              while (position < buffer.Length)
              {
                 int length = Math.Min(ChunkSize, buffer.Length - position);
                 stream.Write(buffer, position, length);
                 position += ChunkSize;
              }
           }
        }
        client.Close();
     }         
  }

这是读取服务器上数据的代码

  public override LogData ReadData(NetworkStream stream)
  {
     if (stream.DataAvailable)
     {
        try
        {
           const int chunkSize = 250;
           byte[] buffer = new byte[IntByteSize];
           int messageSize = 0;
           int totalBytesRead = 0;
           LogData data;
           using (var ms = new MemoryStream())
           {
              if (!ReadFrameMarkers(stream))
                 return null;
              totalBytesRead = stream.Read(buffer, 0, IntByteSize);
              if (totalBytesRead != IntByteSize)
                 return null;
              messageSize = BitConverter.ToInt32(buffer, 0);
              totalBytesRead = 0;
              while ((totalBytesRead < messageSize))
              {
                 int bufferSize = Math.Min(chunkSize, messageSize - totalBytesRead);
                 buffer = new byte[bufferSize];
                 int bytesRead = stream.Read(buffer, 0, bufferSize);
                 if (bytesRead != 0)
                 {
                    totalBytesRead += bytesRead;
                    ms.Write(buffer, 0, bytesRead);
                 }
              }
              ms.Seek(0, SeekOrigin.Begin);
              data = Serializer.Deserialize<LogData>(ms);
           }
           return data;
        }
        catch (Exception ex)
        {
           Console.WriteLine(string.Format("Error occurred: {0}", ex.Message));
           return null;
        }
     }
     return null;
  }

Answer 1

容易一个:你使用:

var buffer = ms.GetBuffer();

然后buffer.Length.这意味着您正在使用超大的填充缓冲区.如果你这样做,你需要使用ms.Length,它会告诉你实际的长度.或者,ms.ToArray()可以使用,但这涉及额外的副本.

我的建议:继续使用GetBuffer(),但只写ms.Length字节,而不是buffer.Length字节.

一旦你删除了这些额外的错误零,我希望你会发现它有效.