Catch bad AD look ups

Question

I'm attempting to write a small line a of powershell script that will check a csv of first and last names from AD and report their usernames. Everything seems to work okay, except it doesn't report names that it couldn't find. Is there a way to incorporate
something like a Try Catch?
The script:
 import-csv C:\Users\1234\Desktop\names.csv | forEach { Get-Aduser -filter "surname -eq '$($_.Last)' -and
givenname -eq '$($_.First)'"}  | Select SamAccountName | Export-CSV C:\users\1234\desktop\usersout.csv
Sample CSV
First,Last
John,Doe
Bob,Smith

Answer 1

Try/Catch won't work when you use the -Filter parameter in Get-ADUser, only when you specify by
-Identity. What you can do is test for the existence of the object like this:
import-csv C:\Users\1234\Desktop\names.csv | forEach {
$User = Get-Aduser -filter "surname -eq '$($_.Last)' -and givenname -eq '$($_.First)'"
If ($User) {
$User
} Else {
Write-Warning ("Could not find user by Surname <{0}> and Givenname <{1}>" -f $_.Last, $_.First)
} | Select SamAccountName | Export-CSV C:\users\1234\desktop\usersout.csv
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