Select a Parameter set from Parameter set

Question

I've been trying to create a Parameter set for my module that has Parameter Set Names that change due to the Validate set selection that is chosen.

Example

[CmdletBinding(DefaultParameterSetName='All Need')]
Param
(
    [Parameter(Mandatory=$true, 
       ValueFromPipeline=$true,
       ValueFromPipelineByPropertyName=$true, 
       ValueFromRemainingArguments=$false, 
       Position=0,
       ParameterSetName='All')]
    [ValidateSet("Selection A","Selection B","Selection C")]
    [String]$1,

    [Parameter(Mandatory=$true,
    ParameterSetName='All')]
    [String]$2,

    [Parameter(ParameterSetName='A')]
    [String]$3,

    [Parameter(ParameterSetName='B')]
    [String]$4,

    [Parameter(ParameterSetName='C')]
    [String]$5
)

But I have been unable to find a way (for example) to only show Parameter set B if I select Selection B in the validate set.

postanote · Answer 1 · 2020-03-12T05:23:15.447

Yes, you can, by using a neat little feature called Dynamic Parameter Set. Read details here:

How To Implement Dynamic Parameters in Your PowerShell Functions

How to Declare Dynamic Parameters

This example shows how to define dynamic parameters that are added to the cmdlet at runtime. In this example, the Department parameter is added to the cmdlet whenever the user specifies the Employee switch parameter. For more information about dynamic parameters, see Cmdlet Dynamic Parameters.

and here:

Creating Dynamic Sets for ValidateSet

Dynamic Parameters in PowerShell

Simple example:

Function Get-Order 
{
    [CmdletBinding()]
    Param
    (
      [Parameter(
         Mandatory=$true,
         Position=1,
         HelpMessage="How many cups would you like to purchase?"
      )]
      [int]$cups,

      [Parameter(
         Mandatory=$false,
         Position=2,
         HelpMessage="What would you like to purchase?"
      )]
      [ValidateSet("Lemonade","Water","Tea","Coffee")]
      [string]$product="Lemonade"
   )

   Process 
   {
      $order = @()
      for ($cup = 1; $cup -le $cups; $cup++) {
          $order += "$($cup): A cup of $($product)"
      }
      $order
   }
}

So, with that, your question could be seen as a duplicate of this StackOverflow Q&A that is a longer version of the simple one above.

Can I make a parameter set depend on the value of another parameter

Showing an accepted answer and modification for the final use case by the OP.

function New-DynamicParameter
{
    [CmdletBinding(DefaultParameterSetName = 'Core')]    
    param
    (
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)][string] $Name,
        [Parameter(Mandatory = $true, ParameterSetName = 'Core')][Parameter(Mandatory = $true, ParameterSetName = 'ValidateSet')][type] $Type,
        [Parameter(Mandatory = $false)][string] $ParameterSetName = '__AllParameterSets',
        [Parameter(Mandatory = $false)][bool] $Mandatory = $false,
        [Parameter(Mandatory = $false)][int] $Position,
        [Parameter(Mandatory = $false)][bool] $ValueFromPipelineByPropertyName = $false,
        [Parameter(Mandatory = $false)][string] $HelpMessage,
        [Parameter(Mandatory = $true, ParameterSetName = 'ValidateSet')][string[]] $ValidateSet,
        [Parameter(Mandatory = $false, ParameterSetName = 'ValidateSet')][bool] $IgnoreCase = $true
    )

    process
    {
        # Define Parameter Attributes
        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
        $ParameterAttribute.ParameterSetName = $ParameterSetName
        $ParameterAttribute.Mandatory = $Mandatory
        $ParameterAttribute.Position = $Position
        $ParameterAttribute.ValueFromPipelineByPropertyName = $ValueFromPipelineByPropertyName
        $ParameterAttribute.HelpMessage = $HelpMessage

        # Define Parameter Validation Options if ValidateSet set was used
        if ($PSCmdlet.ParameterSetName -eq 'ValidateSet')
        {
            $ParameterValidateSet = New-Object System.Management.Automation.ValidateSetAttribute -ArgumentList $ValidateSet -Strict (!$IgnoreCase)
        }

        # Add Parameter Attributes and ValidateSet to an Attribute Collection
        $AttributeCollection = New-Object Collections.ObjectModel.Collection[System.Attribute]
        $AttributeCollection.Add($ParameterAttribute)
        $AttributeCollection.Add($ParameterValidateSet)

        # Add parameter to parameter list
        $Parameter = New-Object System.Management.Automation.RuntimeDefinedParameter -ArgumentList @($Name, $Type, $AttributeCollection)

        # Expose parameter to the namespace
        $ParameterDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
        $ParameterDictionary.Add($Name, $Parameter)
        return $ParameterDictionary
    }
}

function Authenticate
{
  param
  (
    [ValidateSet('WindowsAuthentication','UsernameAndPassword')][string] $AuthenticationType
  )

  DynamicParam
  {
    if ($AuthenticationType -eq 'UsernameAndPassword')
    {
      New-DynamicParameter Username [string] -Mandatory $true
      New-DynamicParameter Password [string] -Mandatory $true
    }
  }
}

Select a Parameter set from Parameter set

1 Answers1