XPath 不适用于在 XML 中进行选择 [英] XPath does not work for selecting in XML
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问题描述
我有一个 XML 文档,但我终生无法使用 XPath 获取数据.我已经尝试了我能找到的每一个样本,但没有运气.我正在尝试提取电子邮件地址.有什么想法吗?
I have an XML document and for the life of me I cannot get data by using XPath. I've tried every sample I could find and no luck. I'm trying to extract the email address. Any thoughts?
XML:
<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:hl7-org:v3" xsi:schemaLocation="urn:hl7-org:v3 CDA.xsd">
<typeId root="test1" extension="test2"/>
<id root="test3" extension="test4"/>
<code code="test5" codeSystem="test6" />
<effectiveTime value="201509171214"/>
<confidentialityCode code="N" codeSystem="test7" codeSystemName="test8" displayName="normal"/>
<languageCode code="en"/>
<recordTarget>
<Role>
<id root="000000" extension="number1"/>
<id root="11111" extension="number2"/>
<addr>
<streetAddressLine>Street</streetAddressLine>
<postalCode>12345</postalCode>
<city>City</city>
<state>STATE</state>
<country>COUNTRY</country>
</addr>
<telecom value="number" use="HP"/>
<telecom value="number" use="MC"/>
<telecom value="email@email"/>
<person>
<name>
<family>family</family>
<given>given</given>
<prefix/>
<suffix/>
</name>
<administrativeGenderCode code="C" codeSystem="code" codeSystemName="code name" displayName="c"/>
<birthTime value="N/A"/>
</person>
</Role>
</recordTarget>
</Document>
加载:
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.LoadXml(STRING DATA FROM XML);
XPathNavigator foo = xmlDocument.CreateNavigator();
foo.MoveToFollowing(XPathNodeType.Element);
foo.Select("Document/recordTarget/Role");
我也试过:
XmlNodeList xmlNodeList = xmlDocument.SelectNodes("/Document/recordTarget/Role");
但是这些都不起作用.一切都空空如也.有任何想法吗?我似乎无法越过根目录.
But none of this works. Everything comes back empty. Any ideas? I can't seem to navigate past the root.
我也尝试在选择中添加命名空间管理器,但没有成功.
I've also tried adding the namespace manager in the selects, with no luck.
XmlNamespaceManager manager = new XmlNamespaceManager(xmlDocument.NameTable);
推荐答案
必须添加命名空间
XPathNavigator navigator = xmlDocument.CreateNavigator();
XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("ns", "urn:hl7-org:v3");
var role = navigator.Select("/ns:Document/ns:recordTarget/ns:Role", manager);
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