尝试将 XML 子文件从一个文件导入到另一个文件 [英] Trying to import XML children from one file to another

问题描述

我已经调查了这个 发帖，发现几乎正是我需要做的.但是，鉴于本文中的建议，我无法产生预期的输出.基本上，我试图从包含以下内容的 XML ($ManifestFile) 文件中导入 </parameter> 元素:

I have looked into this post and found that it is almost exactly what I need to do. However, I am not able to produce the output expected given the suggestion in this post. Basically, I am trying to import </parameter> elements from an XML ($ManifestFile) file that contains something like:

<?xml version="1.0" encoding="utf-8"?>
<plasterManifest
  schemaVersion="1.1"
  templateType="Project" xmlns="http://www.microsoft.com/schemas/PowerShell/Plaster/v1">
  <metadata>
    <name>PlasterTestProject</name>
    <id>4c08dedb-7da7-4193-a2c0-eb665fe2b5e1</id>
    <version>0.0.1</version>
    <title>Testing creating custom Plaster Template for CI/CD</title>
    <description>Testing out creating a module project with Plaster for complete CI/CD files.</description>
    <author>Catherine Meyer</author>
    <tags></tags>
  </metadata>
  <parameters>
        <parameter name='AuthorName' type="user-fullname" prompt="Module author's name" />
        <parameter name='ModuleName' type="text" prompt="Name of your module" />
        <parameter name='ModuleDescription' type="text" prompt="Brief description on this module" />
        <parameter name='ModuleVersion' type="text" prompt="Initial module version" default='0.0.1' />
        <parameter name='GitLabUserName' type="text" prompt="Enter the GitLab Username to be used" default="${PLASTER_PARAM_FullName}"/>
        <parameter name="GitLubRepo" type="text" prompt="GitiLab repo name for this module" default="${PLASTER_PARAM_ModuleName}"/>
        <parameter name='ModuleFolders' type = 'multichoice' prompt='Please select folders to include' default='0,1'>
            <choice label='&amp;Public' value='Public' help='Folder containing public functions that can be used by the user.'/>
            <choice label='&amp;Private' value='Private' help='Folder containing internal functions that are not exposed to users'/>
        </parameter>
    </parameters>
</plasterManifest>

我尝试导入的文档 ($NewManifestFile) 如下所示:

The document ($NewManifestFile) I'm trying to import into looks like:

<?xml version="1.0" encoding="utf-8"?>
<plasterManifest schemaVersion="1.1" templateType="Project" xmlns="http://www.microsoft.com/schemas/PowerShell/Plaster/v1">
  <metadata>
     <name>test3</name>
     <id>8c028f40-cdc6-40dc-8442-f5256a8c0ed9</id>
     <version>0.0.1</version>
     <title>test3</title>
     <description>SDSKL</description>
     <author>NAME</author>
    <tags> </tags>
  </metadata>
  <parameters>
  </parameters>
  <content>
  </content>
</plasterManifest>

我写的代码看起来像:

$ManifestFile = [xml](Get-Content ".\PlasterManifest.xml")
$NewManifestFile = [xml](Get-Content $PlasterMetadata.Path)
$NewManifestFile.plasterManifest.metadata.name

$Parameters = $ManifestFile.SelectSingleNode("//plasterManifest/parameters/parameter")
$Parameters
$NewParameters = $NewManifestFile.SelectSingleNode("//plasterManifest/parameters")
#Importing the parameters and content
foreach ($parameter in $Parameters) {
   $NewParamElem = $ManifestFile.ImportNode($parameter, $true)
   $NewParameters.AppendChild($NewParamElem)
}
[void]$NewManifestFile.save($PlasterMetadata.Path)

现在，它不会出错，但也根本不会导入.似乎某些元素未在某处正确分配.我尝试了很多替代方案，而这似乎是唯一接近我想要的.有什么建议么?

Now, it doesn't error out, but it also doesn't import at all. It seems as though some element is not being assigned properly somewhere. I have tried so many alternatives, and this seems to be the only one that is close to what I want. Any suggestions?

推荐答案

正如 mklement0 所指出的，您的 XML 文档有命名空间，因此在选择带有 XPath 表达式的节点时需要一个命名空间管理器.使用 dot-access 来选择节点可以让你绕过命名空间管理，但由于 dot-access 并不总是像人们期望的那样工作，我仍然建议坚持使用 SelectNodes() 并使用适当的命名空间经理.

As mklement0 pointed out, your XML documents have namespaces, so you need a namespace manager when selecting nodes with XPath expressions. Using dot-access for selecting the nodes gets you around namespace management, but since dot-access doesn't always work the way one might expect I'd still recommend sticking with SelectNodes() and using proper namespace managers.

$uri = 'http://www.microsoft.com/schemas/PowerShell/Plaster/v1'

[xml]$ManifestFile = Get-Content 'C:\path\to\old.xml'
$nm1 = New-Object Xml.XmlNamespaceManager $ManifestFile.NameTable
$nm1.AddNamespace('ns1', $uri)

[xml]$NewManifestFile = Get-Content 'C:\path\to\new.xml'
$nm2 = New-Object Xml.XmlNamespaceManager $NewManifestFile.NameTable
$nm2.AddNamespace('ns2', $uri)

$ManifestFile.SelectNodes('//ns1:parameter', $nm1) | ForEach-Object {
    $newnode = $NewManifestFile.ImportNode($_, $true)
    $parent  = $NewManifestFile.SelectSingleNode('//ns2:parameters', $nm2)
    $parent.AppendChild($newnode) | Out-Null
}

$NewManifestFile.Save('C:\path\to\new.xml')

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