Advanced function with nested Parameter sets

PowerShell Help
1

Hi,

I am working on this function where I need to use parameter sets because I have 2 parameters that cannot be used together.
Var1 in set 1 and var2 in set2.
That works fine.

I also have var 3 which is a switch and when that switch is set var4 is mandatory.
Therefore I put var3 and var4 in their own ParameterSet set3

Furthermore there is a parameter var5.
When var5 is set var6 is mandatory
Therefore I put them in Set4

Var1 should be mandatory for all sets except Set2
Var2 should be mandatory for all sets except Set1

This is what I think should be the param block:

function Get-Something 
{
    [CmdletBinding(DefaultParameterSetName='Set1')]
    Param
    (
        [Parameter(ParameterSetName='Set1',
                   Position = 0,
                   Mandatory=$True)]
                   [String]
                   $Var1,

        [Parameter(ParameterSetName='Set2',
                   Position = 0,
                   Mandatory=$True)]
                   [String]
                   $Var2,

        [Parameter(ParameterSetName='Set1', Mandatory = $False)]
        [Parameter(ParameterSetName='Set2', Mandatory = $False)]
        [Parameter(ParameterSetName='Set3',
                   Position = 1,
                   Mandatory=$False)]
                   [switch]
                   $Var3,
                   

        [Parameter(ParameterSetName='Set1', Mandatory = $False)]
        [Parameter(ParameterSetName='Set2', Mandatory = $False)]
        [Parameter(ParameterSetName='Set3',
                   Position = 2,
                   Mandatory=$True)]
                   [Array]
                   $Var4,

        [Parameter(ParameterSetName='Set1', Mandatory = $False)]
        [Parameter(ParameterSetName='Set2', Mandatory = $False)]
        [Parameter(ParameterSetName='Set4',
                   Position = 3,
                   Mandatory=$False)]
                   $Var5,


        [Parameter(ParameterSetName='Set1', Mandatory = $False)]
        [Parameter(ParameterSetName='Set2', Mandatory = $False)]
        [Parameter(ParameterSetName='Set4',
                   Position = 4,
                   Mandatory=$True)]
		   [String]
                   $Var6

     )
}

This is what I get when I run this function:

SYNTAX
    Get-Something [-Var1]  [-Var3] [-Var4 ] [-Var5 ] [-Var6 ]  []
    
    Get-Something [-Var2]  [-Var3] [-Var4 ] [-Var5 ] [-Var6 ]  []
    
    Get-Something [[-Var3]] [-Var4]   []
    
    Get-Something [[-Var5] ] [-Var6]   []

Line 1 looks fine but when I set var3, the function never asks for var4 same counts for var5 and var6
Same counts for line 2
Line 3 should show var4 as mandatory which it is not
Line 4 should show var6 as mandatory which it is not.
Last, line 3 and 4 imply that it should be possible to run the command without var1 or var2 which can never be the case.

Can someone enlighten me?

Thank you in advance.

2

If I understand your scenario correctly, I think this should achive what you want.

function Get-Something 
{
    [CmdletBinding(DefaultParameterSetName='Set1')]
    Param(
        [Parameter(ParameterSetName='Set1', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1ab', Mandatory = $True)]
        [String]
        $Var1,

        [Parameter(ParameterSetName='Set2', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2ab', Mandatory = $True)]
        [String]
        $Var2,

        [Parameter(ParameterSetName='Set1a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1ab', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2ab', Mandatory = $True)]
        [switch]
        $Var3,

        [Parameter(ParameterSetName='Set1a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1ab', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2a', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2ab', Mandatory = $True)]
        [Array]
        $Var4,

        [Parameter(ParameterSetName='Set1b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1ab', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2ab', Mandatory = $True)]
        $Var5,


        [Parameter(ParameterSetName='Set1b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set1ab', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2b', Mandatory = $True)]
        [Parameter(ParameterSetName='Set2ab', Mandatory = $True)]
        [String]
        $Var6
     )
}

And here are the resulting syntaxes

SYNTAX
    Get-Something -Var1   []
    
    Get-Something -Var1  -Var3 -Var4  -Var5  -Var6   []
    
    Get-Something -Var1  -Var5  -Var6   []
    
    Get-Something -Var1  -Var3 -Var4   []
    
    Get-Something -Var2  -Var3 -Var4  -Var5  -Var6   []
    
    Get-Something -Var2  -Var5  -Var6   []
    
    Get-Something -Var2  -Var3 -Var4   []
    
    Get-Something -Var2   []

(forum eats some of the syntax text)

3

Thank you Christian,

working although not asking for value if value is missing but erroring out it, works.

Regards, Jack