Mastering Windows PowerShell Scripting - Third Edition

Using the resource

The complete class, ComputerDescription, incorporating each of the preceding methods, is shown here:

enum Ensure {    Absent    Present}[DscResource()]class ComputerDescription {    [DscProperty(Key)]    [Ensure]$Ensure    [DscProperty()]    [String]$Description    Hidden [String] $path = 'HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters'    Hidden [String] $valueName = 'svrcomment'    [ComputerDescription] Get() {        $key = Get-Item $this.Path        if ($key.GetValueNames() -contains $this.valueName) {            $this.Ensure = 'Present'            $this.Description = $key.GetValue($this.valueName)        } else {            $this.Ensure = 'Absent'        }        return $this    }    [Void] Set() {        $params = @{            Path = $this.path            Name = $this.valueName        }        if ($this.Ensure -eq 'Present') { New-ItemProperty ...