Set-XmlAttribute.ps1
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function Set-XmlAttribute { [CmdletBinding()] param ( # Path to the XML file [Parameter(Mandatory)] [string]$path, # XPath to the element (e.g. /configuration/appSettings/add[@key='DatabasePath']); must exist already [Parameter(Mandatory)] [string]$element, # The name of the attribute; will be created if it does not exist [Parameter(Mandatory)] [string]$name, # new value of the attribute [Parameter(Mandatory)] [string]$value ) if (!(Test-Path -PathType Leaf $path)) { Write-Error "File not found: $path" return } $path = Resolve-Path $path $document = [xml](Get-Content $path) if ($document -eq $null) { Write-Error "File not a valid XML document: $path" } Write-Verbose "Performing XPath query: $element" $elementNode = $document.SelectSingleNode($element) if ($elementNode -eq $null) { Write-Error "Element not found: $element" } $elementNode.SetAttribute($name, $value) # Be sure to format the XML on save, otherwise it will be nasty and everyone will hate touching/viewing it. $xmlSettings = New-Object System.Xml.XmlWriterSettings $xmlSettings.Indent = $true $xmlSettings.IndentChars = "`t" $xmlSettings.Encoding = [Text.Encoding]::UTF8 $xmlWriter = [Xml.XmlWriter]::Create($path, $xmlSettings) $document.Save($xmlWriter) $xmlWriter.Dispose() } |