If you want to get more control over function parameters, you can treat them as hash table. So in your function, you can then check whether a certain parameter was specified by the caller, and then act accordingly:
function Do-Something {
[CmdletBinding()]
param(
$name,
$surname = "Default",
$age,
$id
)
[CmdletBinding()]
param(
$name,
$surname = "Default",
$age,
$id
)
# treat all submitted parameters as hashtable:
$params = $PSCmdlet.MyInvocation.BoundParameters
# act in response of submitted and omitted parameters:
if ($params.ContainsKey('name')) {
'You specified -name and submitted {0}' -f $params['name']
} else {
'You did not specify -name'
}
}
Do-Something
You did not specify -name
Do-Something -id 1
You did not specify -name
Do-Something -name weltner
You specified -name and submitted weltner
