Problems passing parameters into Get-ADComputer/Get-ADUser

PowerShell Help
1

I’m specifying mandatory input parameters as part of a function I’m writing, but I’m wondering how the native AD cmdlets like that string input.

Function Get-IAAMLincPassException
{
	[CmdletBinding()]
	[OutputType([System.Object])]
	Param (
		# Name should be a valid computer name.
		[Parameter(Mandatory = $true,
				   ValueFromPipeline = $true,
				   ValueFromPipelineByPropertyName = $true,
				   ValueFromRemainingArguments = $false)]
		[Alias('HostName', 'Identity', 'DNSHostName')]
		[string[]]$computerName,
		[Parameter(Mandatory = $true,
				   ValueFromPipeline = $false)]
		[string[]]$lastName,
		[Parameter(Mandatory = $true,
				   ValueFromPipeline = $false)]
		[string[]]$firstName
	)
	Begin
	{
	}
	Process
	{
			if ($computerInfo = Get-ADComputer $computerName -Properties * -ErrorAction Stop)
			{
				if ($userInfo = Get-ADUser -Filter {Surname -eq $lastName -and GivenName -eq $firstName}  )
				{

This script excerpt bonks out with

Get-ADComputer : Cannot convert 'System.String[]' to the type 'Microsoft.ActiveDirectory.Management.ADComputer'
required by parameter 'Identity'. Specified method is not supported.

I’ll keep googling, but perhaps someone can chime in?

Thanks!

2

It’s because you’re accepting a string, which is a string array. -Identity will accept a single string, not an array. So if you’re getting more than one, you need to enumerate them and only query for one at a time.

3

Makes sense why specifying the parameter as Read-Host with only one input works. Sounds like a foreach ($computer in $computerName) {scriptblock} will work so I only enumerate one object at a time?

Thank you, Don!

4

Yup. Exactly.

It’d work with pipeline input as-is, because PROCESS is an implicit ForEach.