PowerShell在顶部插入xml节点

Question

我想在其他现有子节点的顶部插入一个xml节点。

我的代码的问题是它附加在底部。

我尝试了InsertBefore()，但一直出现错误

例如：

<Providers>
<----I want to insert a provider here
<provider>
<id>87585857587</id>
<type>AD</type>
<name>Demo1</name>
<event>saga</event>
<username></username>
<item>NEV</item>
<password></password>
</provider>
</Providers>

我的代码：

$varGorup = @{"type"="AD";"name"="DEMO";"event"="DNS";"username"="user1";"item"="store";"password"="password1";}
$file = [XML](Get-Content $xmlFile)
$providerNode = $file.providers.AppendChild($file.CreateElement("provider"))
$varGorup | % getEnumerator | % {

$childNode = $providerNode.AppendChild($file.CreateElement($_.key))
$childNode.AppendChild($file.CreateTextNode($_.value)) | Out-Null
}

$file.save($xmlFile)

我试过了：

$file =  [XML](Get-Content $xmlFile) 
$providers = $file.SelectSingleNode('/providers') 
$provider  = $file.CreateElement("provider")
$file.InsertBefore($provider,$providers)

但是得到这个错误

Exception calling "InsertBefore" with "2" argument(s): "This document already has a 'DocumentElement' node."

Answer 1

使用语法InsertBefore:

$xmlfile ="C:test.xml"
$xml = [XML](Get-Content $xmlFile)
$varGorup = @{"type"="AD";"name"="DEMO";"event"="DNS";"username"="user1";"item"="store";"password"="password1";}
#calcul the number of node, if total is 0 do an AppendChild, else do that
$total = $xml.Providers.ChildNodes.Count

if($total -eq 0){
$providerNode = $file.providers.AppendChild($xml.CreateElement("provider"))      
} else{
$providerNode = $xml.providers.InsertBefore($xml.CreateElement("provider"), $xml.Providers.ChildNodes[0])
}
$varGorup | % getEnumerator | % {

$childNode = $providerNode.AppendChild($xml.CreateElement($_.key))
$childNode.AppendChild($xml.CreateTextNode($_.value)) | Out-Null
}
$xml.save($xmlFile)