删除XML节点 [英] Remove XML Node

问题描述

我有一个XML文件，其中包含要删除的< Notes> 节点。

I have an XML file which contains a <Notes> node that I wish to remove.

<APPOrganisationUnits>
  <APPOrganisationUnitsRow num="1">
    <OrganisationId>TEST1</OrganisationId>
    <APPContactDetails>
      <APPContactDetailsRow num="1">
        <Notes>Notes 1</Notes>
      </APPContactDetailsRow>
      <APPContactDetailsRow num="2">
        <Notes>Notes 2</Notes>
      </APPContactDetailsRow>
      <APPContactDetailsRow num="3">
        <Notes>Notes 3</Notes>
      </APPContactDetailsRow>
    </APPContactDetails>
  </APPOrganisationUnitsRow>
  <APPOrganisationUnitsRow num="2">
    <OrganisationId>TEST2</OrganisationId>
    <APPContactDetails>
      <APPContactDetailsRow num="1">
        <Notes>Notes 1</Notes>
      </APPContactDetailsRow>
      <APPContactDetailsRow num="2">
        <Notes>Notes 2</Notes>
      </APPContactDetailsRow>
    </APPContactDetails>
  </APPOrganisationUnitsRow>
</APPOrganisationUnits>

对于每个< notes> 节点，我只想删除它。我的代码可以运行但不会删除节点。

For each instance of the <notes> node I just want to remove it. My code this which runs but does not remove the nodes.

$XMLFile = "$Provider_Root\Processing\small.xml"
$xml = [xml](Get-Content $XMLFile)

foreach ($APPContactDetailsRow in $xml.APPOrganisationUnits.APPOrganisationUnitsRow.APPContactDetails) {
    if ($APPContactDetailsRow.Item('Notes')) {
        $APPContactDetailsRow.RemoveChild($_)
    }
}
$xml.Save($XMLFile)
}

推荐答案

当前对象变量（ $ _ ）未在循环上下文中填充。您需要先将子节点放入变量中，然后才能将其删除。另外，仅仅因为您在特定类型的节点后命名了变量，并不能通过该变量自动枚举节点。

The current object variable ($_) isn't populated in the context of your loop. You need to put the child node into a variable before you can remove it. Also, Just because you name a variable after a particular type of nodes doesn't automagically enumerate the nodes via this variable. You need to actually expand the nodes.

更改此内容：

foreach ($APPContactDetailsRow in $xml.APPOrganisationUnits.APPOrganisationUnitsRow.APPContactDetails) {
    if ($APPContactDetailsRow.Item('Notes')) {
        $APPContactDetailsRow.RemoveChild($_)
    }
}

变成这样：

foreach ($APPContactDetailsRow in $xml.APPOrganisationUnits.APPOrganisationUnitsRow.APPContactDetails.APPContactDetailsRow) {
    $n = $APPContactDetailsRow.Item('Notes')
    if ($n) {
        $APPContactDetailsRow.RemoveChild($n)
    }
}

这样，选择具有 XPath表达式并使用管道删除它们：

With that said, it'd probably be simpler to select the nodes with an XPath expression and use a pipeline for deleting them:

$xml.SelectNodes('//AppContactDetailsRow/Notes') | ForEach-Object {
    $_.ParentNode.RemoveChild($_)
}

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