Multiple mandatory parameters in a single parameter set

Question

I want to achieve the following in my parameter sets:

function [A | B] [C | D] (E) (F)

In English as concise as possible, I would like A, B, C and D to be Manadatory=$true but A and B can't be in the same command nor can C and D. E and F will always be optional.

I figured I could expand this with multiple ParameterSetName attributes following the below logic:

function A C (E) (F)
function A D (E) (F)
function B C (E) (F)
function B D (E) (F)

However the below sentence says each parameter set must have a unqiue parameter, but as you can see I use A and B twice each. The only way for the PowerShell runtime to identify them as unique parameter sets is by looking at two paremters, not just one.

Each parameter set must have a unique parameter that the Windows PowerShell runtime can use to expose the appropriate parameter set

Source

Is there some way to achieve this?

Answer 1

I think you'll need to create 4 parameter sets, A-C, A-D, B-C and B-D, you will need to define all the parameters in each set, e. g. you'll need to define A twice, once in set A-C and once in set A-D.

Don't put E or F in any set.

I created some mock code to show what I mean:

function Test-abcdef
{
    param
    (
        [Parameter(Mandatory = $true,ParameterSetName = 'a-c')]
        [Parameter(Mandatory = $true,ParameterSetName = 'a-d')]
        $a,
        
        [Parameter(Mandatory = $true,ParameterSetName = 'b-c')]
        [Parameter(Mandatory = $true,ParameterSetName = 'b-d')]
        $b,

        [Parameter(Mandatory = $true,ParameterSetName = 'a-c')]
        [Parameter(Mandatory = $true,ParameterSetName = 'b-c')]
        $c,
        
        [Parameter(Mandatory = $true,ParameterSetName = 'a-d')]
        [Parameter(Mandatory = $true,ParameterSetName = 'b-d')]
        $d,
        
        [Parameter]
        $e,
        
        [Parameter]
        $f
    )
    
    switch ($PsCmdlet.ParameterSetName)
    {
        'a-c' {
            Write-Output $a $c
            break
        }
        'a-d' {
            Write-Output $a $d
            break
        }
        'b-c' {
            Write-Output $b $c
            break
        }
        'b-d' {
            Write-Output $b $d
            break
        }
    }
}

help Test-abcdef

If you do help on the function as above it gives you the following:

NAME
Test-abcdef

SYNTAX
Test-abcdef -a <Object> -d <Object> [-e <Parameter>] [-f <Parameter>]  [<CommonParameters>]

Test-abcdef -a <Object> -c <Object> [-e <Parameter>] [-f <Parameter>]  [<CommonParameters>]

Test-abcdef -b <Object> -d <Object> [-e <Parameter>] [-f <Parameter>]  [<CommonParameters>]

Test-abcdef -b <Object> -c <Object> [-e <Parameter>] [-f <Parameter>]  [<CommonParameters>]

Which I believe is exactly what you wanted.