xml - Powershell:读取/编辑命名节点

Question

我想从给定的XML文件中读取和编辑节点内容，然后将更改后的内容写回。
给定XML文件的内容:

<?xml version="1.0" encoding="UTF-8"?>
<SimBase.Document Type="ScenarioFile" version="4,5" id="Test">
  <Descr>AceXML Document</Descr>
  <Filename>Test.fxml</Filename>
  <Flight.Sections>
    ...
    <Section Name="DateTimeSeason">
      <Property Name="Season" Value="Summer" />
      <Property Name="Year" Value="2020" />
      <Property Name="Day" Value="224" />
      <Property Name="Hours" Value="12" />
      <Property Name="Minutes" Value="2" />
      <Property Name="Seconds" Value="17" />
    </Section>
    ...
  </Flight.Sections>
</SimBase.Document>

读取和写回XML文件的新副本可以很好地工作，但是我完全不知如何读取/编辑名为“DateTimeSeason”的节点的内容。它的节点，因为我不知道XPath。
我写的脚本内容:

Write-Host "Edit XML file"

# Load local functions
. .\LocalFunctions.ps1

# Working environment
$flightFileDir     = 'E:\Temp\PowerShell\P3D\'
$flightFileNameIn  = 'MauleLSZH.fxml'
$flightFileNameOut = 'MauleLSZHNew.fxml'
$flightFileIn      =  $flightFileDir + $flightFileNameIn
$flightFileOut     =  $flightFileDir + $flightFileNameOut

# Get correct date and time for flight file
$dateTimeArr = SetupDateTime
#$dateTimeArr           # output content of resulting array

# Set up new XML object and read file content
$xmlFlight  = New-Object System.XML.XMLDocument
$xmlFlight.Load($flightFileIn)

# Edit content of node named 'DateTimeSeason'
$data = $xmlFlight.'SimBase.Document'.'Flight.Sections'.Section[@name -eq 'DateTimeSeason'].Property[@name = 'Year']
$data                   # output for test purposes

# Output modified flight file
$xmlFlight.Save($flightFileOut)

Write-Host "New XML file created"

非常感谢您的帮助或提示
汉尼斯

Answer 1

你很亲密这是更正后的版本，它添加了新的“属性”并编辑了现有属性的“值”。

# Set up new XML object and read file content
$xmlFlight  = New-Object System.XML.XMLDocument
$xmlFlight.Load($flightFileIn)

# Create new "Property" and append to the "DateTimeSeason" node
[System.Xml.XmlElement]$newElement = $xmlFlight.CreateElement('Property')
$newElement.SetAttribute('Name','NewName')
$newElement.SetAttribute('Value','NewValue')
$data = $xmlFlight.'SimBase.Document'.'Flight.Sections'.SelectSingleNode("//Section[@Name='DateTimeSeason']")
[void]$data.AppendChild($newElement)

# Edit "Year" Property on the "DateTimeSeason" node
$xmlFlight.'SimBase.Document'.'Flight.Sections'.SelectSingleNode("//Section[@Name='DateTimeSeason']").SelectSingleNode("//Property[@Name = 'Year']").Value = '2021'
# Could also use: $data.SelectSingleNode("//Property[@Name = 'Year']").Value = '2021'

$data.Property # output for test purposes

# Output modified flight file
$xmlFlight.Save($flightFileOut)

Write-Host "New XML file created"

注意:XPath区分大小写，因此“@name”在这里不起作用。必须使用“@Name”。