Question

我为WCF服务提供了以下XML输入。使用XmlReader我正在验证消息并替换为新消息。在此过程中，xml名称空间别名从xmlns:soapenv更改为xmlns:s

为了在重新创建消息时维护命名空间别名，需要在以下C＃代码中进行哪些更改？

请参阅WCF message body showing <s:Body>... stream ...</s:Body> after modification查看正确的已更换邮件内容。

来自WCF Extensibility – Message Inspectors

WCF消息对象只能被“消费”一次 - 而“消费”可能意味着读取，写入或复制。消息体本质上是一次性读取流，因此一旦消耗它就不能再次使用。因此，如果在检查器代码中，有人要读取消息，那么WCF运行时将无法在其管道的其余部分重用该消息（即，将其编码为作为回复发送或将其解析为操作参数）。因此，如果检查员代码需要阅读消息，则检查员有责任重新创建消息。

输入

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
<soapenv:Header>
<To soapenv:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://local:54956/Service1.svc</To>
<Action soapenv:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://tempuri.org/IService1/GetData</Action>
</soapenv:Header>
<soapenv:Body>
  <tem:GetData>
     <!--Optional:-->
     <tem:value>4</tem:value>
  </tem:GetData>
</soapenv:Body>
</soapenv:Envelope>

CODE

 private void MyInspectorsValidateMessageBody(ref System.ServiceModel.Channels.Message message, bool isARequest)
    {

        string originalMessageText = message.ToString();

        if (!message.IsFault)
        {
            XmlDictionaryReaderQuotas quotas = new XmlDictionaryReaderQuotas();
            XmlReader bodyReader = message.GetReaderAtBodyContents().ReadSubtree();

            //Settings
            XmlReaderSettings wrapperSettings = new XmlReaderSettings();
            wrapperSettings.CloseInput = true;
            wrapperSettings.ValidationFlags = XmlSchemaValidationFlags.None;
            wrapperSettings.ValidationType = ValidationType.Schema;

            //Add a event handler for ValidationEventHandler of XmlReaderSettings
            //Validation happens while read of xml instance
            //wrapperSettings.ValidationEventHandler += new ValidationEventHandler(MyHandlerForXMLInspectionErrors);

            XmlReader wrappedReader = XmlReader.Create(bodyReader, wrapperSettings);

            this.isRequest = isARequest;

            MemoryStream memStream = new MemoryStream();
            XmlDictionaryWriter xdw = XmlDictionaryWriter.CreateBinaryWriter(memStream);
            xdw.WriteNode(wrappedReader, false);
            xdw.Flush(); memStream.Position = 0;

            XmlDictionaryReader xdr = XmlDictionaryReader.CreateBinaryReader(memStream, quotas);

            //Reconstruct the message with the validated body
            Message replacedMessage = Message.CreateMessage(message.Version, null, xdr);
            replacedMessage.Headers.CopyHeadersFrom(message.Headers);
            replacedMessage.Properties.CopyProperties(message.Properties);
            message = replacedMessage;

            string replacedMessageText = replacedMessage.ToString();

        }
    }

输出

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<To s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://local:54956/Service1.svc</To>
<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://tempuri.org/IService1/GetData</Action>
</s:Header>
<s:Body>... stream ...</s:Body>
</s:Envelope>

Answer 1

不，它没有改变命名空间。它正在将用于引用的前缀更改为命名空间，但在这两种情况下，命名空间本身都是"http://schemas.xmlsoap.org/soap/envelope/"。

来自原始文件：

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
                  xmlns:tem="http://tempuri.org/">

从输出中：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">

什

XmlDictionaryReader更改xml名称空间别名

1 个答案: