Does a DynamicParameter Switch not read like a Static Parameter [switch]? - powershell

Question

Hopefully the Title is clear enough but, I am having some trouble understanding on how to evaluate against a DynamicParameter Switch, compared to a Static (type casted) switch.
In the following code block, there are 2 switches that become available only if the other 2 parameters are not null, and/or, are not empty:
Add
Remove
Function Test-DynamParam {
Param (
# Input Parameters
[Parameter(Mandatory = $false,
HelpMessage='Enter. Workflow. Name.')]
[Alias('OMB','MailBox')]
[string]$Workflow,
[Parameter(Mandatory = $false)]
[Alias('EDIPI','DisplayName')]
[string[]]$UserName
)
DynamicParam {
if ($Workflow -ne $null -and $UserName -ne $null) {
$parameterAttribute = [System.Management.Automation.ParameterAttribute]#{
ParameterSetName = "AddingMembers"
Mandatory = $false
}
$attributeCollection = [System.Collections.ObjectModel.Collection[System.Attribute]]::new()
$attributeCollection.Add($parameterAttribute)
$dynParam1 = [System.Management.Automation.RuntimeDefinedParameter]::new(
'Add', [switch], $attributeCollection
)
$paramDictionary = [System.Management.Automation.RuntimeDefinedParameterDictionary]::new()
$paramDictionary.Add('Add', $dynParam1)
$parameterAttribute1 = [System.Management.Automation.ParameterAttribute]#{
ParameterSetName = "RemovingMembers"
Mandatory = $false
}
$attributeCollection1 = [System.Collections.ObjectModel.Collection[System.Attribute]]::new()
$attributeCollection1.Add($parameterAttribute1)
$dynParam11 = [System.Management.Automation.RuntimeDefinedParameter]::new(
'Remove', [switch], $attributeCollection1
)
$paramDictionary.Add('Remove', $dynParam11)
return $paramDictionary
}
}
Process {
$Add.IsPresent
}
}
Running:
Test-DynamParam -Workflow 'd' -UserName 'a' -Add
returns empty.
Unfortunately, $Add.IsPresent is not evaluated to any boolean value regardless if the switch is present or not. Yet in this function it is (which makes sense):
Function Test-StaticParam {
Param (
[switch]$Add
)
$Add.IsPresent
}
Running:
Test-StaticParam -Add
returns True.
Question
How can I evaluate against dynamic parameter chosen?

Answer 1

Use the $PSBoundParameters automatic variable:
Process {
$PSBoundParameters['Add'].IsPresent
}