如何獲取此元素的xpath？

Question

我需要返回dependentAssembly的codebase屬性（即asmv1：組裝=>依賴=> dependentAssembly（第一個）=> codebase屬性）

下面是XML文件：

<?xml version="1.0" encoding="utf-8"?> 
<asmv1:assembly xsi:schemaLocation="urn:schemas-microsoft-com:asm.v1 assembly.adaptive.xsd" manifestVersion="1.0" xmlns:asmv1="urn:schemas-microsoft-com:asm.v1" xmlns="urn:schemas-microsoft-com:asm.v2" xmlns:asmv2="urn:schemas-microsoft-com:asm.v2" xmlns:xrml="urn:mpeg:mpeg21:2003:01-REL-R-NS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:co.v1="urn:schemas-microsoft-com:clickonce.v1" xmlns:co.v2="urn:schemas-microsoft-com:clickonce.v2"> 
    <assemblyIdentity name="program.application" version="3.4.95.1045" publicKeyToken="98ecb8aa8cf73f16" language="neutral" processorArchitecture="msil" xmlns="urn:schemas-microsoft-com:asm.v1" /> 
    <description asmv2:publisher="publisher" asmv2:product="Magical Christmas Land" xmlns="urn:schemas-microsoft-com:asm.v1">Magical Christmas Land</description> 
    <deployment install="true" minimumRequiredVersion="3.4.95.1045" co.v1:createDesktopShortcut="true"> 
    <subscription> 
     <update> 
     <beforeApplicationStartup /> 
     </update> 
    </subscription> 
    </deployment> 
    <compatibleFrameworks xmlns="urn:schemas-microsoft-com:clickonce.v2"> 
    <framework targetVersion="4.5.2" profile="Client" supportedRuntime="4.0.30319" /> 
    <framework targetVersion="4.5.2" profile="Full" supportedRuntime="4.0.30319" /> 
    </compatibleFrameworks> 
    <dependency> 
    <dependentAssembly dependencyType="install" codebase="3.0.8\program.exe.manifest" size="214085"> 
     <assemblyIdentity name="program.exe" version="3.0.8" publicKeyToken="48ecb8aa8cf73f16" language="neutral" processorArchitecture="msil" type="win32" /> 
     <hash> 
     <dsig:Transforms> 
      <dsig:Transform Algorithm="urn:schemas-microsoft-com:HashTransforms.Identity" /> 
     </dsig:Transforms> 
     <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha256" /> 
     <dsig:DigestValue>rawr</dsig:DigestValue> 
     </hash> 
    </dependentAssembly> 
    </dependency> 

這裏的我試過的：

這個工作並獲取彙編元素，並在其中的7個子節點（依賴是其中之一）。只要我添加「/ asmv1：程序集/依賴項」它失敗並返回null。

 var nsmgr = new XmlNamespaceManager(xmlDoc.NameTable); 
     nsmgr.AddNamespace("asmv1", "urn:schemas-microsoft-com:asm.v1"); 

     var node = xmlDoc.DocumentElement.SelectSingleNode(@"/asmv1:assembly", nsmgr); 

這工作，但它的超醜：

var childNode = node.ChildNodes 
          .OfType<XmlElement>() 
          .First(n => n.LocalName == "dependency") 
          .ChildNodes[0] 
          .Attributes["codebase"].InnerText; 

Answer 1

dependency繼承默認命名空間，其URI是urn:schemas-microsoft-com:asm.v2：

var nsmgr = new XmlNamespaceManager(xmlDoc.NameTable); 
nsmgr.AddNamespace("asmv1", "urn:schemas-microsoft-com:asm.v1"); 
nsmgr.AddNamespace("asmv2", "urn:schemas-microsoft-com:asm.v2"); 

var node = xmlDoc.DocumentElement.SelectSingleNode(@"/asmv1:assembly/asmv2:dependency", nsmgr);