Calling a method on an existing instance of an object found using Get-WmiObject is similar to any .NET method call.

The following example gets and restarts the DNS Client service. The following operation requires administrative access:

$service = Get-WmiObject Win32_Service -Filter "DisplayName='DNS Client'" 
$service.StopService()    # Call the StopService method 
$service.StartService()# Call the StartService method  

The WMI class can be used to find details of a method, for example, the Create method of Win32_Share:

PS> (Get-WmiObject Win32_Share -List).Methods['Create']
Name          : Create
InParameters  : System.Management.ManagementBaseObject
OutParameters : System.Management.ManagementBaseObject
Origin        : Win32_Share
Qualifiers    : {Constructor, Implemented, MappingStrings, Static}

Where the Invoke-CimMethod command accepts a hashtable, the Invoke-WmiMethod command expects arguments to be passed as an array in a specific order. The order can be retrieved by using the GetMethodParameters method of the WMI class:

PS> (Get-WmiObject Win32_Share -List).GetMethodParameters('Create')


__GENUS          : 2
__CLASS          : __PARAMETERS
__SUPERCLASS     : 
__DYNASTY        : __PARAMETERS
__RELPATH        : 
__PROPERTY_COUNT : 7
__DERIVATION     : {}
__SERVER         : 
__NAMESPACE      : 
__PATH           : 
Access           : 
Description      : 
MaximumAllowed   : 
Name             : 
Password         : 
Path             : 
Type             : 
PSComputerName   :

To create a share, the argument list must therefore contain an argument for Access, then Description, then MaximumAllowed, and so on. If the argument is optional, it can be set to null; however, PowerShell is unable to say which are mandatory, so a trip to the MSDN is required:

https://msdn.microsoft.com/en-us/library/aa389393(v=vs.85).aspx

Having established that Path, Name, and Type are mandatory, an array of arguments can be created in the order described by GetMethodParameters:

$argumentList = $null,            # Access 
                $null,            # Description 
                $null,            # MaximumAllowed 
                'Share1',         # Name 
                $null,            # Password 
                'C:TempShare1', # Path 
                0                 # Type (Disk Drive) 
Invoke-WmiMethod Win32_Share -Name Create -ArgumentList $argumentList 

The return value describes the result of the operation; a ReturnValue of 0 indicates success. As this operation requires administrator privileges (run as administrator), a return value of 2 is used to indicate it was run without sufficient rights.

Adding the ComputerName parameter to Invoke-WmiMethod will create a share on a remote machine.