PowerTip: Use PowerShell to Find Key of WMI Class

Summary: Use Windows PowerShell to find the key of a WMI class.

Hey, Scripting Guy! Question How can I use Windows PowerShell to discover the property that has the key qualifier for a WMI class?  

Hey, Scripting Guy! Answer Use Get-CimClass and iterate through the properties:

$class = Get-CimClass -ClassName Win32_Process

foreach ($property in $class.CimClassProperties) {

 $property | select -ExpandProperty Qualifiers |

 foreach {

   if ($_.Name -eq ‘key’){





Comments (1)

  1. jrv says:

    We can also use a non-linear one-liner:

    Get-CimClass -ClassName Win32_Process |

        select -expand CimClassProperties |


    How is that for a dashing example?