向 XML 文档添加子组

Question

我一直在寻找多种解释，但似乎无法找到解决方案。

我的 XML 如下所示：

<?xml version="1.0" encoding="utf-8"?>
<ConfigRightCollection>
  <ConfigRight Name="CreateSampling">
    <GroupCollection>
      <Group>All</Group>
    </GroupCollection>
  </ConfigRight>
  <ConfigRight Name="InputMeasure">
    <GroupCollection>
      <Group>All</Group>
    </GroupCollection>
  </ConfigRight>
  <ConfigRight Name="AllowCreateOnStoppedJob">
    <GroupCollection>
      <Group>Admin</Group>
    </GroupCollection>
  </ConfigRight>
</ConfigRightCollection>

我想向 'ConfigRight Name = "AllowCreateOnStoppedJob' 组添加新元素，使其看起来像这样：

<?xml version="1.0" encoding="utf-8"?>
<ConfigRightCollection>
  <ConfigRight Name="CreateSampling">
    <GroupCollection>
      <Group>All</Group>
    </GroupCollection>
  </ConfigRight>
  <ConfigRight Name="InputMeasure">
    <GroupCollection>
      <Group>All</Group>
    </GroupCollection>
  </ConfigRight>
  <ConfigRight Name="AllowCreateOnStoppedJob">
    <GroupCollection>
      <Group>Admin</Group>
      <Group>QS</Group>
      <Group>QU</Group>
    </GroupCollection>
  </ConfigRight>
</ConfigRightCollection>

我的代码到目前为止似乎有效：

$filePath = "\\some\path\to\the\file.xml"
[xml]$xmlData = Get-Content -Path $filePath
$xmlData | Select-Xml -XPath '/ConfigRightCollection/ConfigRight' | Where-Object{ ($_.Node.Name -eq "AllowCreateOnStoppedJob") } | Select-Object -ExpandProperty "Node"

但是实际添加新元素的代码不起作用，我收到错误“无法在空值表达式上调用方法”：

$newGroups = "QS","QU"
ForEach ($group in $newGroups)
{
     # Creation of a sub node
     $xmlSubElt = $xmlData.GroupCollection.CreateElement("Group")
     $xmlSubText = $xmlData.GroupCollection.CreateTextNode($group)
     $xmlSubElt.AppendChild($xmlSubText)
}
$xmlData.Save

我似乎无法解决的部分是如何选择正确的 ConfigRight 元素并向其 GroupCollection 子元素添加 2 个新元素？我仅限于 PS 5.1

Answer 1

使用 Xml Linq

using assembly System.Xml.Linq

$inputFilename = "c:\temp\test.xml"
$outputFilename = "c:\temp\tes1.xml"


$doc = [System.Xml.Linq.XDocument]::Load($inputFilename)

$configRight = $doc.Descendants("ConfigRight")
$allowCreateOnStoppedJob = [System.Linq.Enumerable]::Where($configRight, [Func[object,bool]]{ param($x) [string]$x.Attribute("Name").Value -eq "AllowCreateOnStoppedJob"})[0]

$groupCollection = $allowCreateOnStoppedJob.Element('GroupCollection')

$group = [System.Xml.Linq.XElement]::new([System.Xml.Linq.XName]::Get('Group'),'QS')
$groupCollection.Add($group)

$group = [System.Xml.Linq.XElement]::new([System.Xml.Linq.XName]::Get('Group'),'QU')
$groupCollection.Add($group)

$doc.Save($outputFilename)