具有命名空间的 XPath 选择节点 [英] XPath select node with namespace
问题描述
它是一个 .vbproj,看起来像这样
Its a .vbproj and looks like this
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<ProjectGuid>15a7ee82-9020-4fda-a7fb-85a61664692d</ProjectGuid>
我想要的只是 ProjectGuid,但是当存在命名空间时它不起作用...
all i want to get is the ProjectGuid but it does not work when a namespace is there...
Dim xmlDoc As New XmlDocument()
Dim filePath As String = Path.Combine(mDirectory, name + "\" + name + ".vbproj")
xmlDoc.Load(filePath)
Dim value As Object = xmlDoc.SelectNodes("/Project/PropertyGroup/ProjectGuid")
我该怎么做才能解决这个问题?
what can i do to fix this?
推荐答案
执行此类操作的最佳方法 (恕我直言) 是创建命名空间管理器.这可用于调用 SelectNodes 来指示哪些命名空间 URL 连接到哪些前缀.我通常会设置一个静态属性,它会返回一个这样的足够实例(它是 C#,你必须翻译):
The best way to do things like this (IMHO) is to create a namespace manager. This can be used calling SelectNodes to indicate which namespace URLs are connected to which prefixes. I normally set up a static property that returns an adequate instance like this (it's C#, you'll have to translate):
private static XmlNamespaceManager _nsMgr;
public static XmlNamespaceManager NsMgr
{
get
{
if (_nsMgr == null)
{
_nsMgr = new XmlNamespaceManager(new NameTable());
_nsMgr.AddNamespace("msb", "http://schemas.microsoft.com/developer/msbuild/2003");
}
return _nsMgr;
}
}
我在这里只包含一个命名空间,但您可以有多个.然后你可以像这样从文档中选择:
I include only one namespace here, but you could have multiple. Then you can select from the document like this:
Dim value As Object = xmlDoc.SelectNodes("/msb:Project/msb:PropertyGroup/msb:ProjectGuid", NsMgr)
请注意,所有元素都在指定的命名空间中.
Note that all of the elements are in the specified namespace.
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