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

Question

Let\'s say I have a function like:

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


        

Answer 1

You can do this using DynamicParam. I saw a decent post on this recently here.

DynamicParam {
    if ($AuthenticationType -eq 'UsernameAndPassword') {
        #create ParameterAttribute Objects for the username and password
        $unAttribute = New-Object System.Management.Automation.ParameterAttribute
        $unAttribute.Mandatory = $true
        $unAttribute.HelpMessage = "Please enter your username:"
        $pwAttribute = New-Object System.Management.Automation.ParameterAttribute
        $pwAttribute.Mandatory = $true
        $pwAttribute.HelpMessage = "Please enter a password:"

        #create an attributecollection object for the attributes we just created.
        $attributeCollection = new-object System.Collections.ObjectModel.Collection[System.Attribute]

        #add our custom attributes
        $attributeCollection.Add($unAttribute)
        $attributeCollection.Add($pwAttribute)

        #add our paramater specifying the attribute collection
        $unParam = New-Object System.Management.Automation.RuntimeDefinedParameter('username', [string], $attributeCollection)
        $pwParam = New-Object System.Management.Automation.RuntimeDefinedParameter('password', [string], $attributeCollection)

        #expose the name of our parameter
        $paramDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
        $paramDictionary.Add('username', $unParam)
        $paramDictionary.Add('password', $pwParam)
        return $paramDictionary
    }
}

Process {
    $PSBoundParameters.username
    $PSBoundParameters.password
    }