CODEWITHSUNDEEP
functionpowershellvalidationparameters
Yann Greder
Yann Greder

Reputation: 71

Powershell condition parametersetname validateset

I know how to use ValidatetSet and ParameterSetName. I need to change dynamically the value of a ParameterSetName according to a previous value selected in ValidateSet. Is this possible?

it seems that Dynamic Parameters exist: https://social.technet.microsoft.com/wiki/contents/articles/15994.powershell-advanced-function-parameter-attributes.aspx#Dynamic_Parameters

My use case:

param(
    [Parameter(Mandatory=$true)] 
    [string]$Symbol,

    [Parameter(Mandatory=$true)] 
    [ValidateSet("BUY", "SELL")]
    [string]$Side,

    [Parameter(Mandatory=$true)] 
    [ValidateSet("Market", "Limit", "Take limit")]
    [string]$OrderType,

    [Parameter(Mandatory=$false)] 
    [string]$Price,

    [Parameter(Mandatory=$false)] 
    [string]$StopPrice,

    [Parameter(Mandatory=$false)] 
    [string]$Quantity,

    [Parameter(Mandatory=$false)] 
    [string]$quoteOrderQty
)

many conditions needed, e.g if 'Market' is selected from $OrderType then $quoteOrderQty is required and then should be part of the same ParameterSetName.

Hope I'm clear enough, please advise if you have a better approach. Thanks a lot

Yann

Upvotes: 0

Views: 356

Answers (1)

Yann Greder
Yann Greder

Reputation: 71

Dynamic parameters are parameters of a cmdlet, function, or script that are available only under certain conditions. You can also create a parameter that appears only when another parameter is used in the function command or when another parameter has a certain value.

The DP1 parameter is available in the Get-Sample function only when the value of the Path parameter starts with HKLM:

function Get-Sample {
  [CmdletBinding()]
  Param([String]$Name, [String]$Path)

  DynamicParam
  {
    if ($Path.StartsWith("HKLM:"))
    {
      $attributes = New-Object -Type `
        System.Management.Automation.ParameterAttribute
      $attributes.ParameterSetName = "PSet1"
      $attributes.Mandatory = $false
      $attributeCollection = New-Object `
        -Type System.Collections.ObjectModel.Collection[System.Attribute]
      $attributeCollection.Add($attributes)

      $dynParam1 = New-Object -Type `
        System.Management.Automation.RuntimeDefinedParameter("DP1", [Int32],
          $attributeCollection)

      $paramDictionary = New-Object `
        -Type System.Management.Automation.RuntimeDefinedParameterDictionary
      $paramDictionary.Add("DP1", $dynParam1)
      return $paramDictionary
    }
  }
}

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_parameters?view=powershell-7.1#dynamic-parameters

Upvotes: 1

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