自定義客戶端MessageInspector記錄請求但不是響應

Question

我有一個自定義ClientMessageInspector，它記錄了請求但未回覆我的服務。

的代碼是：

namespace MessageListener.Instrumentation 
{ 
    public class MessageInspector : IClientMessageInspector 
    { 

     private Message TraceMessage(MessageBuffer buffer) 
     { 
      // Must use a buffer rather than the original message, because the Message's body can be processed only once. 
      Message msg = buffer.CreateMessage(); 

      using (RREM_GilbaneEntities3 entities3 = new RREM_GilbaneEntities3()) 
      { 
       SOAPMessage soapMessages = new SOAPMessage 
       { 
        SOAPMessage1 = msg.ToString(), 
        created = DateTime.Now, 
        source = "Interface12", 
        sourceIP = "Interface12" 
       }; 
       entities3.SOAPMessages.Add(soapMessages); 
       entities3.SaveChanges(); 
      } 

      //Return copy of origonal message with unalterd State 
      return buffer.CreateMessage(); 
     } 

     public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState) 
     { 
      reply = TraceMessage(reply.CreateBufferedCopy(int.MaxValue)); 
     } 

     public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel) 
     { 
      request = TraceMessage(request.CreateBufferedCopy(int.MaxValue)); 
      return null; 
     } 
    } 
} 

什麼似乎要發生的事情是AfterRecievReply和BeforeSendRequest兩者都被調用。在我調用TraceMessage之前的AfterRecieveReply中，我可以看到整個回覆。裏面TraceMessage，當我這樣做：

// Must use a buffer rather than the original message, because the Message's body can be processed only once. 

     Message msg = buffer.CreateMessage(); 

它變成回覆到垃圾：

msg {<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> 
    <soap:Header /> 
    <soap:Body>... stream ...</soap:Body> 
</soap:Envelope>} 

這是怎麼回事？

Answer 1

回覆不是垃圾短信 - 只是當你打電話給ToString時，它沒有顯示消息的正文。記住一條消息只能被消費一次;一旦它的身體被讀取，它就不能被再次讀取。由於很多地方（包括調試器的監視窗口）都會在對象上調用ToString，所以這種方法的實現方式是，如果它不確定是否可以多次讀取消息體，那麼它不會，這似乎是你的情況。如果你想真正寫出來的消息，請嘗試使用此代碼：

public string MessageToString(Message message) { 
    using (MemoryStream ms = new MemoryStream()) { 
     XmlWriterSettings ws = new XmlWriterSettings(); 
     ws.Encoding = new UTF8Encoding(false); 
     using (XmlWriter w = XmlWriter.Create(ms)) { 
      message.WriteMessage(w); 
      w.Flush(); 
      return ws.Encoding.GetString(ms.ToArray()); 
     } 
    } 
}