ConvertFrom-CliXml.ps1

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function ConvertFrom-CliXml {
    param(
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [String[]]$InputObject
    )
    begin
    {
        $OFS = "`n"
        [String]$xmlString = ""
    }
    process
    {
        $xmlString += $InputObject
    }
    end
    {
        $type = [PSObject].Assembly.GetType('System.Management.Automation.Deserializer')
        $ctor = $type.GetConstructor('instance,nonpublic', $null, @([xml.xmlreader]), $null)
        $sr = New-Object System.IO.StringReader $xmlString
        $xr = New-Object System.Xml.XmlTextReader $sr
        $deserializer = $ctor.Invoke($xr)
        $done = $type.GetMethod('Done', [System.Reflection.BindingFlags]'nonpublic,instance')
        while (!$type.InvokeMember("Done", "InvokeMethod,NonPublic,Instance", $null, $deserializer, @()))
        {
            try {
                $type.InvokeMember("Deserialize", "InvokeMethod,NonPublic,Instance", $null, $deserializer, @())
            } catch {
                Write-Warning "Could not deserialize ${string}: $_"
            }
        }
        $xr.Close()
        $sr.Dispose()
    }
}