我有以下XPATH行：
// DET [@ nItem域=1] /生产/ cProd
这成功地使用选择所需的节点 XPath的展台，它会自动识别名称空间，您可以定义要选择其中的命名空间。
当我指定在C＃中的命名空间与以下XPath code：
http://www.portalfiscal.inf.br/nfe//det [@ nItem域= 1 ] /生产/ cProd
它给了我一个XPathException的：
类型的未处理的异常 System.Xml.XPath.XPathException 发生在system.xml.dll的附加 信息： http://www.portalfiscal.inf.br/nfe//det[@nItem="1"]/prod/cProd 有一个无效的标准名称。
（正如你所看到的，这不是任何转义字符或任何东西，因为它给了我什么，我试图达到的除外）
我该如何正确地选择此节点提供我所知道使用XPath命名空间？
- - 整条生产线，我尝试读取节点：
doc.XPathSelectElement("http://www.portalfiscal.inf.br/nfe//det[@nItem="1"]/prod/cProd").Value;和不必要的东西XML切出：
＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; enviNFe的xmlns =http://www.portalfiscal.inf.br/nfeversao =1.10＆GT;
＆其中; idLote→1＆其中; / idLote＆GT;
＆LT; NFE＆GT;
＆LT; infNFe versao =1.10ID =NFe31100118583682000178550010000077778397333128＆GT;
＆所述; DET nItem域=1＆GT;
＆LT;督促＆GT;
＆其中; cProd＆GT 111所述; / cProd＆GT;
＆LT; / PROD＆GT;
＆LT; / DET＆GT;
＆LT; / infNFe＆GT;
＆LT; / NFE＆GT;
＆LT; / enviNFe＆GT;
（不必要的东西切出不应该是一个问题，因为XPath的展台给我带来的节点没有任何问题）
解决方案既然你不向我们展示，无论是XML文档，也不是C＃code你有，我只能猜测你在做什么.. ..
OK，看来你正在使用LINQ到XML，所以后来用这个code在这里片段：
//创建并加载XML阅读器
XmlReader的读者= XmlReader.Create（新的FileStream（@D. 的test.xml，FileAccess.Read））;
//获取根元素
的XElement根= XElement.Load（读卡器）;
//创建XML命名空间管理实例
XmlNamespaceManager的nsmgr =新的XmlNamespaceManager（reader.NameTable）;
//添加您的命名空间的经理，并给它一个preFIX
nsmgr.AddNamespace（NS，http://www.portalfiscal.inf.br/nfe）;
的XElement节点= root.XPathSelectElement（// NS：DET [@ nItem域=1] / NS：PROD / NS：cProd，nsmgr）;
.......
类似的规定。你基本上要建立某种形式的XML命名空间，给它一个preFIX，然后使用preFIX在你的XPath EX pression - 而不是整个空间 - 只是preFIX
I have the following XPATH line:
//det[@nItem="1"]/prod/cProd
That successfully selects the desired node using XPath Visualizer, where it identifies automatically the namespace, and you define in which namespace you want to select.
When I specify the namespace in C# with the following XPATH code:
"http://www.portalfiscal.inf.br/nfe//det[@nItem="1"]/prod/cProd"
it gives me an XPathException:
An unhandled exception of type 'System.Xml.XPath.XPathException' occurred in System.Xml.dll Additional information: 'http://www.portalfiscal.inf.br/nfe//det[@nItem="1"]/prod/cProd' has an invalid qualified name.
(as you can see, it's not any escape character or anything, since it gives me what i've tried to reach in the exception)
How do I properly select this node providing that I know the namespace with XPath ?
--[EDIT]-- The complete line where I try to read the node:
doc.XPathSelectElement("http://www.portalfiscal.inf.br/nfe//det[@nItem="1"]/prod/cProd").Value;
And the XML with unnecessary things cut out:
<?xml version="1.0" encoding="utf-8"?>
<enviNFe xmlns="http://www.portalfiscal.inf.br/nfe" versao="1.10">
<idLote>1</idLote>
<NFe>
<infNFe versao="1.10" Id="NFe31100118583682000178550010000077778397333128">
<det nItem="1">
<prod>
<cProd>111</cProd>
</prod>
</det>
</infNFe>
</NFe>
</enviNFe>
(The unnecessary things cut out should not be a problem, since XPath Visualizer brought me the node with no problems at all)
解决方案Since you're not showing us neither the XML document, nor the C# code you have, I can only guess what you're doing....
OK, seems you're using Linq-to-XML, so then use this code snippet here:
// Create and load XML reader
XmlReader reader = XmlReader.Create(new FileStream(@"D.test.xml", FileAccess.Read));
// get the root element
XElement root = XElement.Load(reader);
// create instance of XML namespace manager
XmlNamespaceManager nsmgr = new XmlNamespaceManager(reader.NameTable);
// add your namespace to the manager and give it a prefix
nsmgr.AddNamespace("ns", "http://www.portalfiscal.inf.br/nfe");
XElement node = root.XPathSelectElement("//ns:det[@nItem="1"]/ns:prod/ns:cProd", nsmgr);
.......
Something along those lines. You basically have to create a XML namespace of some sort, give it a prefix, and then use that prefix in your XPath expression - not the whole namespace - just the prefix.
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