使用 PowerShell 删除 XML 节点答案

【问题标题】：Remove an XML node using PowerShell使用 PowerShell 删除 XML 节点
【发布时间】：2021-05-31 18:29:24
【问题描述】：

我正在尝试从下面的 XML 中删除 <Element>SlowPollGroup</Element>。 <Markers> 在 XML 文件中有四个层次。我已经使用 $markersExists = $vendor.SelectSingleNode("./Markers") 脚本找到了 <Markers> 作为 $markersExists。

  <Markers>
    <Element>Group2</Element>
    <Element>Group3</Element>
    <Element>Group4</Element>
    <Element>HWSimSubscription</Element>
    <Element>DIO_TC</Element>
    <Element>CmdSubGroup</Element>
    <Element>FastPollGroup</Element>
    <Element>SlowPollGroup</Element>
    <Element>HWSimPoll</Element>
    <Element>WriteOnly</Element>
  </Markers>

我试过下面的脚本：

        $groupNameSPG = "SlowPollGroup"
        $delMarkerElem = $groupNameSPG

        LogWrite ("Searching for Markers")
        $markersExists = $vendor.SelectSingleNode("./Markers")
        if ($null -ne $markersExists) {
            LogWrite ("Markers found")

            foreach($element in $markersExists.Element) {
                if ( $element -eq $delMarkerElem) {
                    LogWrite ($delMarkerElem + " found")
                    $delElem = $element.ParentNode
                    $delMarkerElemFound = $true
                    break
                }
                LogWrite ("Searching for [$delMarkerElem] again")
            }

            if ($delMarkerElemFound) {
                $markersExists.RemoveChild($element) | Out-Null
                LogWrite ("Removed => [$delMarkerElem]")
            }
            else {
                LogWrite ("delMarkerElemFound => [$delMarkerElemFound]")
            }
        }

日志文件摘录如下：

Searching for Markers
Markers found
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
Searching for [SlowPollGroup] again
SlowPollGroup found
Removed => [SlowPollGroup]

但是，当我在 Win10 上的 Windows PowerShell ISE 中测试整个脚本时，输出如下所示：

PowerShell Error v01

我使用了下面的代码：

        $groupsExists = $vendor.SelectSingleNode("./Groups")
        if ($null -ne $groupsExists) {
            LogWrite ("Groups found")
            foreach($element in $groupsExists.Element) {
                if ( $element.Name -eq $groupElemName) {
                    LogWrite ($groupElemName + " found")
                    $groupElemNameFound = $true
                    break
                }
                LogWrite ("Searching for " + $groupElemName + " again")
            }

            if ($groupElemNameFound) {
                $groupsExists.RemoveChild($element) | Out-Null
                LogWrite ("Removed => $groupElemName")
            }
        }

关于下面的 XML

  <Groups>
    <Element>
      <Name>Group1</Name>
      <PollInterval>200</PollInterval>
      <UseDataSubscription>True</UseDataSubscription>
    </Element>
    <Element>
      <Name>AlarmGroup</Name>
      <PollInterval>1000</PollInterval>
    </Element>
    <Element>
      <Name>GVL_TC</Name>
      <PollInterval>100</PollInterval>
    </Element>
  </Groups>

删除最后一个元素，即

    <Element>
      <Name>GVL_TC</Name>
      <PollInterval>100</PollInterval>
    </Element>

它奏效了。我了解这两种 XML 结构不同，我怀疑顶部脚本中的 $element 仅包含“SlowPollGroup”，而不是 <Element>SlowPollGroup</Element>。周末我一直在尝试谷歌搜索提供的各种脚本，但没有骰子。非常感谢任何帮助。

【问题讨论】：

标签： xml powershell powershell-5.1

【解决方案1】：

显然，这个脚本可以按我的意愿工作：

        LogWrite ("Searching for Markers")
        $markersExists = $vendor.SelectSingleNode("./Markers")
        if ($null -ne $markersExists) {
            LogWrite ("Markers found")

            # $delMarkerElem needs to be within ''
            $node = $markersExists.SelectSingleNode("./Element[.='$delMarkerElem']")

            if ($null -ne $node) {
                $node.ParentNode.RemoveChild($node)
                LogWrite ("Removed => Element node=[$node] with delMarkerElem=[$delMarkerElem]")
            }
            else {
                LogWrite ("Not found - Element node=[$node] with delMarkerElem=[$delMarkerElem]")
            }
        }

从此脚本修改：

$node = $conns.SelectSingleNode("//Description[.='HP Command View EVA']")
while ($node -ne $null) {
    $node.ParentNode.RemoveChild($node)
    $node = $conns.SelectSingleNode("//Description[.='HP Command View EVA']")
}

从http://jon.netdork.net/2013/01/09/removing-xml-elements-using-powershell/找到

【讨论】：