Powershell 从 xml 获取文本节点

Question

I am working on a simple powershell script that verify if inside of the xml file the attribute(s) exists. The xml file looks like,

<?xml version="1.0"?>
 <Objects>
  <Object>
   <Property Name="Browser">Firefox</Property>
   <Property Name="PDF">Adobe Reader</Property>
 </Object>
</Objects>

I want the powershell to verify if the attribute Firefox exists, and then to execute a task afterward.

[xml]$file = get-content C:\Admin\personalsettings.xml
$xmlProperties = $file.SelectNodes("/Objects/Object/Property")
Foreach ($xmlProperty in $xmlProperties) {
$strName = ($xmlProperty | Where-Object {$_.Name -eq "Firefox"    }).InnerXml
 If ($strName -eq "False")
 {
 Invoke-Item "C:\windows\protected\browser.exe"
 }
}

Answer 1

Note that Firefox is a child text node (the text content ) of a Property element in your XML, accessible via the latter's .InnerText property.

Therefore, you can retrieve the / test the existence of a Property element of interest as follows, using the Where() array method :

$firefoxElem = $xmlProperties.Where({ $_.InnerText -eq 'FireFox' }, 'First')
$haveFirefoxElem = [bool] $firefoxElem

---

A simpler approach, if you only need to know the presence of the element of interest, is to use PowerShell's XML dot notation , which obviates the need for XPath expressions via .SelectNodes() :

$haveFirefoxElem = $file.Objects.Object.Property.InnerText -contains 'FireFox'

Answer 2

Using xpath (case sensitive):

if (select-xml "/Objects/Object/Property[text()='Firefox']" file.xml) { 'yes' } 
if (select-xml "//Property[text()='Firefox']" file.xml) { 'yes' } 
if (select-xml "//*[Property='Firefox']" file.xml) { 'yes' }
if (select-xml "*[Object[Property[@Name='Browser']='Firefox']]" file.xml) { 'yes' }