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我有以下 WCF 服务的 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 命名空间别名从 更改xmlns:soapenvxmlns: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?

参考WCF 消息正文显示 <s:Body>... stream ...</s:Body> 修改后查看正确的替换消息内容。

来自WCF 可扩展性 – 消息检查器

WCF 消息对象只能“使用”一次——“使用”可以表示读取、写入或复制。消息体本质上是一个只读流,因此一旦被消费,就不能再次使用。因此,如果在检查器代码中读取消息,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,如果检查器代码需要读取消息,检查器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>

代码

 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>
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1 回答 1

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不,它没有改变命名空间。它正在更改用于引用命名空间的前缀,但在这两种情况下命名空间本身都是"http://schemas.xmlsoap.org/soap/envelope/".

从原始文件:

<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/">

没有什么应该关心正在使用什么前缀——重要的是实际命名空间的 URI。

于 2013-03-25T16:39:01.170 回答