#region Parameter
[cmdletBinding(SupportsShouldProcess=$true)]
param(
)
 
#endregion
 
$Files = Get-ChildItem
foreach ($File in $Files){
	if($pscmdlet.ShouldProcess($File.FullName, "Delete File")){
		Remove-Item -LiteralPath $File.FullName
	}
}

#region Parameter
[cmdletBinding(DefaultParametersetname='Set1')]
param(
    [Parameter(ParameterSetName='Set1')][Parameter(ParameterSetName='Set2')]$Para1,
    [Parameter(ParameterSetName='Set2')]$Para2,
    [Parameter(ParameterSetName='Set3')]$Para3,
    [Parameter(ParameterSetName='Set4')]$Para4
)
 
#endregion
 
switch ($pscmdlet.ParameterSetName)
{
    'Set1' {'set1 called'}
    {$_ -in 'Set2','Set3'} {$pscmdlet.ParameterSetName + " called"}
    'Set4' {'set4 called'}
    Default {}
}