Problem
You want to work with advanced features of WMI, but PowerShell’s access (through the [Wmi], [WmiClass], and [WmiSearcher] accelerators) does not directly support them.
Solution
To interact with advanced features through their .NET interface, use the PsBase property of the resulting objects.
Advanced instance features
To get WMI instances related to a given instance, call the GetRelated() method:
$instance = [Wmi] 'Win32_Service.Name="winmgmt"' $instance.PsBase.GetRelated()
To enable security privileges for a command that requires them (such as changing the system time), set the EnablePrivileges property to $true:
$system = GetWmiObject Win32_OperatingSystem $system.PsBase.Scope.Options.EnablePrivileges = $true $system.SetDateTime($class.ConvertFromDateTime("01/01/2007"))
Advanced class features
To retrieve the WMI properties and qualifiers of a class, access the PsBase. Properties property: $class = [WmiClass] "Win32_Service" $class.PsBase.Properties
Advanced query feature
To configure connection options, such as Packet Privacy and Authentication, set the options on the Scope property:
$credential = GetCredential $query = [WmiSearcher] "SELECT * FROM IISWebServerSetting" $query.Scope.Path = "\\REMOTE_COMPUTER\Root\MicrosoftIISV2" $query.Scope.Options.Username = $credential.Username $query.Scope.Options.Password = $credential.GetNetworkCredential().Password $query.Scope.Options.Authentication = "PacketPrivacy" $query.get() | SelectObject AnonymousUserName
Discussion
The [Wmi], [WmiClass], and [WmiSearcher] type shortcuts return instances of .NET System.Management.ManagementObject, System.Management.ManagementClass, and System.Management.ManagementObjectSearcher classes, respectively.
As might be expected, the .NET Framework provides comprehensive support for WMI queries, with PowerShell providing an easiertouse interface to that support. If you need to step outside the support offered directly by PowerShell, these classes in the .NET Framework provide an advanced outlet.
