powershell - Catch exception from external windows command utility

Question

I'm trying to terminate a script when running an external command results in an error. Consider this simple code:

try {
    where.exe Test-App
}

catch {
    Write-Error "Exception caught." -ErrorAction Continue
    throw
}

Write-Host "Test message!"

Output:

where.exe : INFO: Could not find files for the given pattern(s).
At line:2 char:5
    where.exe Test-App
...
Test message!

Is it possible to enter the catch block and throw, when an external command results in an error?

Desired output:

C:ScriptsTest-Script.ps1 : Exception caught.

Answer 1

As TheIncorrigible1 suggests, inspect $LASTEXITCODE, like so:

$where = where.exe test 2>&1
if($LASTEXITCODE -ne 0){
    throw "Exception caught."
    return
}
# otherwise continue, grab actual output from $where