XML DocumentElement正在回收innerXml

Question

我有一个简单的XML文件，如下所示，当通过一个基本的XmlDocument.Load(filename.xml)读入它时。如果我加载这个文件，并检查它的innerXML，它看起来一切正常。然而，当我检查DocumentElement的值时，它是一团糟！我将示例保持较小，这样您就可以很容易地看到没有错误的形式：

<?xml version="1.0" encoding="UTF-8"?>
<fax:FaxService xmlns:fax="http://www.hp.com/schemas/imaging/con/service/fax/2009/02/11/" xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">
  <fax:ServiceDefaults>
    <fax:ServiceSendDefaults>
      <fax:InternetFaxSettings>
        <dd:FaxFileFormat>MTIFFG4</dd:FaxFileFormat>
        <dd:UseEmailAsFaxAcctAddr>false</dd:UseEmailAsFaxAcctAddr>
        <dd:AutoCompleteToNANP>false</dd:AutoCompleteToNANP>
        <dd:RetryInterval>0</dd:RetryInterval>
        <dd:MaxRetryAttempts>0</dd:MaxRetryAttempts>
      </fax:InternetFaxSettings>
    </fax:ServiceSendDefaults>
  </fax:ServiceDefaults>
</fax:FaxService>

现在，用下面的简单代码在C#中尝试一下：

..。

XmlDocument xDoc = new XmlDocument();
xDoc.Load("*XMLSAMPLE.XML*");

textBox1.Text = xDoc.InnerXml;
textBox2.Text = xDoc.DocumentElement.InnerXml;

..。

它完全是乱七八糟的，第二个命名空间与每个dd标签重复，甚至没有包含在最顶层的标签中。

我做错了什么？这快把我逼疯了！

Answer 1

xDoc.DocumentElement.InnerXml返回的内容在语义上与原始的ServiceDefaults标记相同-如果第一个片段符合您的XML schema，那么InnerXml片段也将符合内部元素的定义。仅仅因为框架重新排列了名称空间声明并不会改变文档的语义。

两个XmlDocument属性的Compare the output：

xDoc.DocumentElement

<?xml version="1.0" encoding="UTF-8"?>
   <fax:FaxService xmlns:fax="http://www.hp.com/schemas/imaging/con/service/fax/2009/02/11/" xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">
    <fax:ServiceDefaults>
     <fax:ServiceSendDefaults>
      <fax:InternetFaxSettings>
        <dd:FaxFileFormat>MTIFFG4</dd:FaxFileFormat>
        <dd:UseEmailAsFaxAcctAddr>false</dd:UseEmailAsFaxAcctAddr>
        <dd:AutoCompleteToNANP>false</dd:AutoCompleteToNANP>
        <dd:RetryInterval>0</dd:RetryInterval>
        <dd:MaxRetryAttempts>0</dd:MaxRetryAttempts>
      </fax:InternetFaxSettings>
     </fax:ServiceSendDefaults>
    </fax:ServiceDefaults>
  </fax:FaxService>

xDoc.DocumentElement.InnerXml

<fax:ServiceDefaults xmlns:fax="http://www.hp.com/schemas/imaging/con/service/fax/2009/02/11/">
  <fax:ServiceSendDefaults>
   <fax:InternetFaxSettings>
     <dd:FaxFileFormat xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">MTIFFG4</dd:FaxFileFormat>
     <dd:UseEmailAsFaxAcctAddr xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">false</dd:UseEmailAsFaxAcctAddr>
     <dd:AutoCompleteToNANP xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">false</dd:AutoCompleteToNANP>
     <dd:RetryInterval xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">0</dd:RetryInterval>
     <dd:MaxRetryAttempts xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">0</dd:MaxRetryAttempts>
   </fax:InternetFaxSettings>
  </fax:ServiceSendDefaults>
 </fax:ServiceDefaults>

Answer 2

在MSDN中查看以下链接将有助于了解您的情况：

http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.innerxml.aspx

基本上，xDoc.DocumentElement.InnerXml查看的是<fax:ServiceDefaults>节点，而xDoc.InnerXml查看的是更高级别的节点(FaxService节点)。这对于理解您的问题至关重要-因为您的所有xmlns都在FaxService节点上。

对XML文档进行以下更改，并注意发生了什么(基本上，将xmlns信息复制到ServiceDefaults节点：

<?xml version="1.0" encoding="UTF-8"?>
<fax:FaxService xmlns:fax="http://www.hp.com/schemas/imaging/con/service/fax/2009/02/11/" xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">
  <fax:ServiceDefaults xmlns:fax="http://www.hp.com/schemas/imaging/con/service/fax/2009/02/11/" xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0/">
    <fax:ServiceSendDefaults>
      <fax:InternetFaxSettings>
        <dd:FaxFileFormat>MTIFFG4</dd:FaxFileFormat>
        <dd:UseEmailAsFaxAcctAddr>false</dd:UseEmailAsFaxAcctAddr>
        <dd:AutoCompleteToNANP>false</dd:AutoCompleteToNANP>
        <dd:RetryInterval>0</dd:RetryInterval>
        <dd:MaxRetryAttempts>0</dd:MaxRetryAttempts>
      </fax:InternetFaxSettings>
    </fax:ServiceSendDefaults>
  </fax:ServiceDefaults>
</fax:FaxService>

突然之间，你的代码就会按照你的期望运行。所以希望这能帮助你理解这个问题。永久的解决方案应该是什么，这取决于你。

哈！