Get all parameters from specific parameter sets - powershell

Question

I am having some trouble getting the parameters from a specific parameter set. I have solved it by getting all parameters and using $parDetails.Name.Contains("FileAttachment") as an if statement.
What I would like instead is to get the parameters from a specific parameter set.
Can someone please help me with this? Below is the code I am currently using.
$CommandName = $PSCmdlet.MyInvocation.InvocationName
$ParameterList = (Get-Command -Name $CommandName).Parameter
foreach ($key in $ParameterList.keys) {
Write-Verbose "Starting loop for $key"
$parDetails = Get-Variable -Name $key
}

Answer 1

Using PSv4+ syntax:
# Sample cmdlet and parameter set to inspect.
# To determine all parameter-set names for a given cmdlet, use:
# (Get-Command $commandName).ParameterSets.Name
$cmd = 'Get-Item'
$paramSet = 'Path'
# Get all parameters associated with the specified parameter set.
$paramsInSet = (Get-Command $cmd).ParameterSets.Where({$_.Name -eq $paramSet}).Parameters
# Output the names of all parameters in the set.
$paramsInSet.Name
The above yields:
Path
Filter
Include
Exclude
Force
Credential
Verbose
Debug
ErrorAction
WarningAction
InformationAction
ErrorVariable
WarningVariable
InformationVariable
OutVariable
OutBuffer
PipelineVariable

Answer 2

Here's a script which looks for parameters in a specific parameter set (or in all parameter sets). It should get you what you're looking for.
$commandName='Get-ChildItem'
$ParameterSetToMatch='LiteralItems'
$ParameterList = (Get-Command -Name $commandName).Parameters.Values
foreach($parameter in $parameterList){
$parameterSets=$parameter.ParameterSets.Keys
if($parameterSets -contains '__AllParameterSets'){
write-host "$($parameter.Name) is in __AllParameterSets"
} elseif ($parameterSets -contains $parameterSetToMatch ){
write-host "$($parameter.Name) is in $parameterSetToMatch"
}
}
If you just want the items specifically in the parameterset, here's a shorter version:
$commandName='Get-ChildItem'
$ParameterSetToMatch='Items'
$parameterlist |
Where-object {$_.ParameterSets.Keys -contains $ParameterSetToMatch} |
select-object Name