wcf读取message内容

 private string MessageToString(ref Message message)
 {
     WebContentFormat messageFormat = this.GetMessageContentFormat(message);
     MemoryStream ms = new MemoryStream();
     XmlDictionaryWriter writer = null;
     switch (messageFormat)
     {
         case WebContentFormat.Default:
         case WebContentFormat.Xml:
             writer = XmlDictionaryWriter.CreateTextWriter(ms);
             break;
         case WebContentFormat.Json:
             writer = JsonReaderWriterFactory.CreateJsonWriter(ms);
             break;
         case WebContentFormat.Raw:
             return this.ReadRawBody(ref message);
     } 

     message.WriteMessage(writer);
     writer.Flush();
     string messageBody = Encoding.UTF8.GetString(ms.ToArray()); 

     ms.Position = ;
     // 这里需要将message重新写入
     XmlDictionaryReader reader;
     if (messageFormat == WebContentFormat.Json)
     {
         reader = JsonReaderWriterFactory.CreateJsonReader(ms, XmlDictionaryReaderQuotas.Max);
     }
     else
     {
         reader = XmlDictionaryReader.CreateTextReader(ms, XmlDictionaryReaderQuotas.Max);
     } 

     Message newMessage = Message.CreateMessage(reader, int.MaxValue, message.Version);
     newMessage.Properties.CopyProperties(message.Properties);
     message = newMessage; 

     return messageBody;
 }

    private WebContentFormat GetMessageContentFormat(Message message)
 {
     WebContentFormat format = WebContentFormat.Default;
     if (message.Properties.ContainsKey(WebBodyFormatMessageProperty.Name))
     {
         WebBodyFormatMessageProperty bodyFormat;
         bodyFormat = (WebBodyFormatMessageProperty)message.Properties[WebBodyFormatMessageProperty.Name];
         format = bodyFormat.Format;
     } 

     return format;
 }

    private string ReadRawBody(ref Message message)
 {
     XmlDictionaryReader bodyReader = message.GetReaderAtBodyContents();
     bodyReader.ReadStartElement("Binary");
     byte[] bodyBytes = bodyReader.ReadContentAsBase64();
     string messageBody = Encoding.UTF8.GetString(bodyBytes); 

     // Now to recreate the message
     MemoryStream ms = new MemoryStream();
     XmlDictionaryWriter writer = XmlDictionaryWriter.CreateBinaryWriter(ms);
     writer.WriteStartElement("Binary");
     writer.WriteBase64(bodyBytes, , bodyBytes.Length);
     writer.WriteEndElement();
     writer.Flush();
     ms.Position = ;
     XmlDictionaryReader reader = XmlDictionaryReader.CreateBinaryReader(ms, XmlDictionaryReaderQuotas.Max);
     Message newMessage = Message.CreateMessage(reader, int.MaxValue, message.Version);
     newMessage.Properties.CopyProperties(message.Properties);
     message = newMessage; 

     return messageBody;
 }