使用 Powershell 删除和更新 Xml 节点

Question

我有以下 xml

  <system.net>
    <defaultProxy useDefaultCredentials="true" />
  </system.net>

并且想使用 Powershell 将上面的“defaultProxy”节点替换为下面的节点

<system.net>    
   <defaultProxy>
      <proxy usesystemdefault="True" proxyaddress="http://xxxxx" bypassonlocal="True" />
      <bypasslist>
        <add address="yyyyyy" />
      </bypasslist>
    </defaultProxy>
</system.net>

我见过类似的帖子，但没有看到嵌套节点。我就是无法理解它

Answer 1

这有点乏味，但你可以像这样构建一个新的

<defaultProxy />

替换：

# parse xml document
$configurationDoc = [xml]@'
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.net>
    <defaultProxy useDefaultCredentials="true" />
  </system.net>
</configuration>
'@

# create new <defaultProxy /> element
$newDefaultProxy = $configurationDoc.CreateElement('defaultProxy')

# create new <proxy /> element, add to previous element
$newProxy = $configurationDoc.CreateElement('proxy')
$newProxy.SetAttribute('usesystemdefault', $true) 
$newProxy.SetAttribute('proxyaddress', "http://xxxxx")
$newProxy.SetAttribute('bypassonlocal', $True)
$newDefaultProxy.AppendChild($newProxy) |Out-Null

# create new <bypasslist /> element with child node, add to previous element
$newBPL = $configurationDoc.CreateElement('bypasslist')
$addresses = @('address_goes_here')
foreach($address in $addresses) {
  $newAdd = $configurationDoc.CreateElement('add')
  $newAdd.SetAttribute('address', $address)
  $newBPL.AppendChild($newAdd) |Out-Null
}
$newDefaultProxy.AppendChild($newBPL) |Out-Null

# replace existing defaultProxy element, or append if not found
$existingDefaultProxy = $configurationDoc.SelectSingleNode('//defaultProxy')
if ($null -ne $existingDefaultProxy) {
  $configurationDoc.ReplaceChild($newDefaultProxy, $existingDefaultProxy) |Out-Null
}
else {
  $configurationDoc.AppendChild($newDefaultProxy) |Out-Null
}

保存文档：

$configurationDoc.Save($(Convert-Path path\to\export.xml))