Foreach error handling in Powershell

Question

Is there a way to catch and save bad names in a foreach loop? I have the following:

$CollectionName = "Import Test"
$PCName = Import-Csv "C:\Powershell\import_test.csv" 
foreach($computer in $PCName) {
Add-CMDeviceCollectionDirectMembershipRule -CollectionName $CollectionName -ResourceID $(Get-   CMDevice -Name $computer.computername).ResourceID
}

What I would like to do is that if there is a bad name in the csv then instead of displaying the "Cannot validate argument" error I currently get, just output the failed name to a text file.

Thanks

Have you played with -ErrorAction? Also, here's a page about catching exceptions in powershell: stackoverflow.com/questions/4691874/… — user645280
– user645280, Commented Jul 22, 2013 at 20:19

Ansgar Wiechers · Accepted Answer · 2013-07-22 20:25:42Z

11

Yes. Put the statement(s) inside the loop in a try..catch block:

foreach($computer in $PCName) {
  try {
    Add-CMDeviceCollectionDirectMembershipRule ...
  } catch {
    "Bad name: $name" | Out-File 'C:\bad_names.txt' -Append
  }
}

If the error is a non-terminating error (i.e. displays an error message, but isn't caught by try..catch), you can turn it into a terminating error by adding -ErrorAction Stop to the command or by setting $ErrorActionPreference = "Stop".

answered Jul 22, 2013 at 20:25

Ansgar Wiechers

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1 Comment

Michael Over a year ago

Thank you, works perfect. I've read about try catch but haven't used them before.

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