使用c＃获取XPAth的xml属性
[英]Getting an xml attribute with XPAth using c#
问题描述
I'm trying to get an attribute from the XML but I'm getting an error: 
我正在尝试从XML获取属性，但我收到一个错误：
Expression must evaluate to a node-test
I'm new to XPath. 我是XPath的新手。
XML file example: XML文件示例：
<Message>
<Head>
<Sender Identifier="id" ref=""/>
</Head>
</Message>
Code: 码：
XPathDocument xDoc = new XPathDocument("documentName.xml");
XPathNavigator nav = xDoc.CreateNavigator();
XPathNodeIterator xpathNode = nav.Select("/Message/Head/Sender/[@Identifier]");
//This is where I get the error.
And I'm also not sure how to display the attribute value. 而且我也不确定如何显示属性值。
3 个解决方案
解决方案1
2 2012-11-29 08:48:34
It should be 它应该是
/Message/Head/Sender[@Identifier]
^
|->no need of / here since Identifier is an attribute of sender
So, 所以，
/Message/Head/Sender[@Identifier] would only select Sender if it has an Identifier attribute /Message/Head/Sender[@Identifier]只有在具有Identifier属性的情况下才会选择Sender
/Message/Head/Sender[@Identifier='id'] would only select Sender if it has an Identifier attribute with value id /Message/Head/Sender[@Identifier='id']只有在具有值id的Identifier属性时才会选择Sender
解决方案2
1 2012-11-29 08:46:07
Here is the wonderful tool to evaluate Xpath of the given XML 这是评估给定XML的Xpath的绝佳工具
go to this link http://www.xmltoolbox.com/ and try to paste your xml in the textarea and move your cursor to the node you want Xpath.Xpath will be generated below 转到此链接http://www.xmltoolbox.com/并尝试将您的xml粘贴到textarea中并将光标移动到您希望在下面生成Xpath.Xpath的节点
解决方案3
-1 2012-11-29 08:47:16
XmlIO xml = new XmlIO(xmlPath);
ProductName = xml.SelectNodeValue(@"//PRODUCTINFO/Application/@ProductName");
IDictionary<string, string> keyValList = xml.SelectNodesList(@"//PRODUCTINFO/Application/Parameters");
Take a look 看一看
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