Powershell script to transform a config file using a XML-Document-Transform file

transform.ps1

function XmlDocTransform($xml, $xdt, $output)
{
    if (!$xml -or !(Test-Path -path $xml -PathType Leaf)) {
        throw "File not found. $xml";
    }
    if (!$xdt -or !(Test-Path -path $xdt -PathType Leaf)) {
        throw "File not found. $xdt";
    }
    
    $transformDll = ""
    if(Test-Path "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v12.0\Web\Microsoft.Web.XmlTransform.dll"){
        $transformDll = "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v12.0\Web\Microsoft.Web.XmlTransform.dll"
    }
    if(($transformDll -eq "")-and(Test-Path "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v11.0\Web\Microsoft.Web.XmlTransform.dll")){
        $transformDll = "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v11.0\Web\Microsoft.Web.XmlTransform.dll"
    }
    if(($transformDll -eq "")-and(Test-Path "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\Web\Microsoft.Web.XmlTransform.dll")){
        $transformDll = "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\Web\Microsoft.Web.XmlTransform.dll"
    }
    if($transformDll -eq ""){
        $scriptPath = (Get-Variable MyInvocation -Scope 1).Value.InvocationName | split-path -parent
        $transformDll = "$($scriptPath)\Microsoft.Web.XmlTransform.dll"
    }

    Add-Type -Path $transformDll

    $xmldoc = New-Object Microsoft.Web.XmlTransform.XmlTransformableDocument;
    $xmldoc.PreserveWhitespace = $true
    $xmldoc.Load($xml);

    $transf = New-Object Microsoft.Web.XmlTransform.XmlTransformation($xdt);
    if ($transf.Apply($xmldoc) -eq $false)
    {
        throw "Transformation failed."
    }
    $xmldoc.Save($output);
}