的XPath和默认命名空间 [英] XPATHS and Default Namespaces

问题描述

什么是命名空间XPath的背后的故事和支持？做的XPath作为规范precede命名空间？如果我有各种元素都被赋予了默认命名空间的文档：

What is the story behind XPath and support for namespaces? Did XPath as a specification precede namespaces? If I have a document where elements have been given a default namespace:

<foo xmlns="uri" />

看来好像有些XPath处理库将无法识别 //富命名空间，而其他的，因为会。我们小组已将想过的选择是使用常规的前pressions的XPath来增加一个命名空间的preFIX（你可以添加通过XmlNameTable一个名称空间preFIX），但由于XPath是这样一种灵活的语言，这似乎脆当涉及到节点测试。

It appears as though some of the XPath processor libraries won't recognize //foo because of the namespace whereas others will. The option my team has thought about is to add a namespace prefix using regular expressions to the XPath (you can add a namespace prefix via XmlNameTable) but this seems brittle since XPath is such a flexible language when it comes to node tests.

是否有适用于本标准？

我的做法是一个有点hackish但似乎很好地工作;我删除的xmlns 声明用查找/替换，然后应用的XPath。

My approach is a bit hackish but it seems to work fine; I remove the xmlns declaration with a search/replace and then apply XPath.

string readyForXpath = Regex.Replace(xmldocument, "xmlns=\".+\"", String.Empty );

这是一个公平的做法或有没有人解决了这个不同？

Is that a fair approach or has anyone solved this differently?

推荐答案

我试过类似palehorse提出什么样的东西，不能让它的工作。因为我是从一个发布的服务中获取数据我不能改变的XML。我结束了使用的XmlDocument和XmlNamespaceManager的，像这样：

I tried something similar to what palehorse proposed and could not get it to work. Since I was getting data from a published service I couldn't change the xml. I ended up using XmlDocument and XmlNamespaceManager like so:

XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlWithBogusNamespace);            
XmlNamespaceManager nSpace = new XmlNamespaceManager(doc.NameTable);
nSpace.AddNamespace("myNs", "http://theirUri");

XmlNodeList nodes = doc.SelectNodes("//myNs:NodesIWant",nSpace);
//etc

这篇关于的XPath和默认命名空间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！