In the previous tip we showed that the new Get-CimInstance command is missing the important “__Path” property that was returned by Get-WmiObject. Let’s add this property back to Get-CimInstance.
Every instance returned by Get-CimInstance is of type [Microsoft.Management.Infrastructure.CimInstance], so Update-TypeData can be used to add a new property to this type:
$code = { # get key properties $keys = $this.psbase.CimClass.CimClassProperties.Where{$_.Qualifiers.Name -eq 'Key'}.Name $pairs = foreach($key in $keys) { '{0}="{1}"' -f $key, $this.$key } # add server name $path = '\\{0}\{1}:{2}.{3}' -f $this.CimSystemProperties.ServerName.ToUpper(), # add namespace $this.CimSystemProperties.Namespace.Replace("/","\"), # add class $this.CimSystemProperties.ClassName, # add key properties ($pairs -join ',') return $path } Update-TypeData -TypeName Microsoft.Management.Infrastructure.CimInstance -MemberType ScriptProperty -MemberName __Path -Value $code -Force
Once you run this code, all of your CIM instances have a __Path property again. It differs slightly because the “new” __Path property quotes all key values. For any use cases we tested, this does not make a difference:
PS> $old = Get-WmiObject -Class Win32_BIOS PS> $new = Get-CimInstance -ClassName Win32_BIOS PS> $old.__PATH \\DESKTOP-8DVNI43\root\cimv2:Win32_BIOS.Name="1.0.13",SoftwareElementID="1.0.13",SoftwareElementState=3,TargetOperatingSystem=0,Version="DELL - 20170001" PS> $new.__Path \\DESKTOP-8DVNI43\root\cimv2:Win32_BIOS.Name="1.0.13",SoftwareElementID="1.0.13",SoftwareElementState="3",TargetOperatingSystem="0",Version="DELL - 20170001" PS> [wmi]($old.__Path) SMBIOSBIOSVersion : 1.0.13 Manufacturer : Dell Inc. Name : 1.0.13 SerialNumber : 4ZKM0Z2 Version : DELL - 20170001 PS> [wmi]($new.__Path) SMBIOSBIOSVersion : 1.0.13 Manufacturer : Dell Inc. Name : 1.0.13 SerialNumber : 4ZKM0Z2 Version : DELL - 20170001
