Documenting TRAP and THROW

Nice but Don and Jeffery could not work out the syntax for:

Trap [ExceptionType] {

either it would seem as they don't have an example of how to express [ExceptionType]

nor does Bruce Payette

Sorry, but if they can't work it out how can I?

:J

Umm.

Try this in a script file:

trap [System.DivideByZeroException] { write-host ("trapped " + $_.Exception.GetType().Name); continue; }

(1/$null)

It works just fine

So why do you care about debugging powershell scripts? Umm unless you have the superhuman ability to

Fyi, the sample chapters at Sapien are chapter 1 and 9 (formatting) NOT chapter 11 (trap and throw).

I have to say it: LAME!

It's almost like you guys went out of your way to make sure that all the PowerShell developers and their buddies could make some extra money writing books to fill the voids in your documentation.

What's worse is that this is the first Google hit for powershell trap ... is there anywhere where there is *actual* document about it, instead of a broken link?

http://64.233.169.104/search?q=cache:vo1cixTB8RIJ:www.sapienpress.com/powershell.pdf

The book excerpt says "Trap handlers always execute, no matter what ErrorAction you specify"  

It seems some commands require -ea 'stop' on the command or set globally with $ErrorActionPreference = "Stop"

How's this for an attempt?

http://huddledmasses.org/trap-exception-in-powershell/

The link to http://www.sapienpress.com/powershell.pdf is busted

The link to the pdf is not working :( Any one have another link I can try?

Cheers for all the hard work!

Zi

This is a great example of how to use Trap and Throw in PowerShell to handle errors besides using SilentlyContinue

Joel "Jaykul" Bennett, that last link to http://huddledmasses.org/trap-exception-in-powershell/ was just perfect.  Thanks a ton.

Why doesn't this trap the "Generic Failure"?

====================

Function Test-Trap1() {

  trap [Exception] {

     write-host

     write-error $("TRAPPED: " + $_.Exception.GetType().FullName);

     write-error $("TRAPPED: " + $_.Exception.Message);

     continue;

  }

$credentials=Get-Credential 'CONTOSO106\Administrator'

if (-not $credentials) {return}

Write-Host "credentials exist."

$SqlCmd=Get-WmiObject `

-Credential $credentials `

-ComputerName 'IDM-SCCM2' `

-Namespace 'ROOT\sms\site_IDM' `

-Class 'SMS_SCI_SQLCmd'

  write-host "done.";

}

cls

Test-Trap1

====================

RESULTS:

====================

   credentials exist.

   Generic failure

   At :line:12 char:22

   + $SqlCmd=Get-WmiObject <<<<   `

   done.

====================