Question

我们有一个接受请求的WCF服务，我们的合作伙伴正在向我们发送如下所示的XML：

<CreateCase xmlns="xyz">
     <OtherNode></OtherNode>
</CreateCase>

为了让WCF正确分派，我们必须将XML包装在包装节点中，例如

<CreateCase xmlns="xyz">
  <CreateCase>
       <OtherNode></OtherNode>
  </CreateCase>
</CreateCase>

我们在AfterReceiveRequest中执行以下操作：

  logger.Log("Received Request - In AfterReceiveRequest Function");
                System.ServiceModel.Channels.Message newMessage = null;
                System.ServiceModel.Channels.MessageBuffer msgbuf = request.CreateBufferedCopy(int.MaxValue);
                System.ServiceModel.Channels.Message tmpMessage = msgbuf.CreateMessage();
                logger.Log("Created Message");

                System.Xml.XmlDictionaryReader xdr = tmpMessage.GetReaderAtBodyContents();
                logger.Log("Created XML Dictionary Reader");

                XmlReader rdr = xdr.ReadSubtree();
                logger.Log("Read Subtree");

                XElement bodyEl = XElement.Load(rdr);
                logger.Log("Read Body: " + bodyEl.ToString());

然后根据需要修改bodyEl并根据字符串重新创建body el /设置新消息：

 //Recreate bodyEl from xml
                    bodyEl = XElement.Load(new MemoryStream(Encoding.UTF8.GetBytes(bodyXml)));


                    MemoryStream ms = new MemoryStream();

                    System.Xml.XmlWriter xw = System.Xml.XmlWriter.Create(ms);
                    bodyEl.Save(xw);
                    xw.Flush();
                    xw.Close();

                    ms.Position = 0;

                    //create new message from modified XML document
                    System.Xml.XmlReader xr = System.Xml.XmlReader.Create(ms);
                    newMessage = System.ServiceModel.Channels.Message.CreateMessage(request.Version, null, xr);
                    newMessage.Headers.CopyHeadersFrom(request);
                    newMessage.Properties.CopyProperties(request.Properties);


                    request = newMessage;

当涉及到包含大量有效负载（25MB文件作为base64编码的字符串）的XML时，第一个XElement.Load似乎令人窒息，因为我在日志中看到的最后一项是“读取子树”。我不确定如何修改此代码以防止这种情况。

任何人都可以阐明这一点吗？

WCF AfterReceiveRequest IDispatchMessageInspector修改消息

0 个答案: