使用XElement查询名称空间中的节点 [英] using XElement to query for a node in namespace

问题描述

我正在尝试从看起来像这样的csproj文件中拉出一个节点，但无法使其正常工作-大概是因为命名空间声明.

i'm trying to pull out a node from a csproj file that looks like this, but can't get it to work - presumably because of the namespace declaration.

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
      <PropertyGroup>
          <RegisterForComInterop>true</RegisterForComInterop>

这很惨:

XDocument cpo = XDocument.Load(file);
XmlNamespaceManager nsm = new XmlNamespaceManager(new NameTable());
nsm.AddNamespace("x", "http://schemas.microsoft.com/developer/msbuild/200");
IEnumerable<XElement> list3 = cpo.XPathSelectElements("//x:RegisterForComInterop[.='true']", nsm);

请问有什么想法吗?

谢谢.

推荐答案

您真的要为此使用XPath吗?在LINQ to XML中使用名称空间确实很容易:

Do you really want to use XPath for this? It's really easy to use namespaces within LINQ to XML:

XDocument cpo = XDocument.Load(file);
XNamespace x = "http://schemas.microsoft.com/developer/msbuild/2003";
var elements = cpo.Descendants(x + "RegisterForComInterop")
                  .Where(x => (string) x == "true");

，或者如果您完全确信每个RegisterForComInterop都将具有适当的布尔值，则可以使用显式XElement到bool转换:

or if you're absolutely convinced that every RegisterForComInterop will have an appropriate Boolean value you can use the explicit XElement to bool conversion:

XDocument cpo = XDocument.Load(file);
XNamespace x = "http://schemas.microsoft.com/developer/msbuild/2003";
var elements = cpo.Descendants(x + "RegisterForComInterop")
                  .Where(x => (bool) x);

如果涉及名称空间，我个人通常会走这条路线，而不是XPath，尤其是.

Personally I would usually go this route rather than XPath especially if namespaces are involved.

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