Powershell Exception trapping

About three months ago I wrote a handy little powershell script utilizing a variety of functions and cmdlets to download a copy of our production data, restore it to a staging environment, cleanse PCI from the data and configure mirroring. At some point this script stopped working. Unfortunately the error messages regarding why it was not working were as follows:

Exception calling "KillDatabase" with "1" argument(s): "Kill database failed for Server 'DBServer.domain.com'. "
Exception calling "SqlRestore" with "1" argument(s): "Restore failed for Server
 'DBServer.domain.com'. "
At D:\scripts\StagingDBMigrate\DBActions.ps1:60 char:20
+     $res.SqlRestore <<<< ($srv)
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

Unfortunately, that doesn’t tell us a whole lot.This is the highest level exception and doesn’t give us much information. Only that the command failed. Here is a handy little piece of code that will help you find the innermost exception that caused your error and spit it out to the host

Trap {
  $error = $_.Exception
  while ( $error.InnerException )
    {
    $error = $error.InnerException
    write-output $error.Message
    };
    continue
  }

This piece of code will loop through the exception chain until it gets to what should be the root cause of the failure, printing the trace along the way. This turned our previously arcane error message into a cleanly understandable error that looks something like this

Exception calling "KillDatabase" with "1" argument(s): "Kill database failed for Server 'DBServer.domain.com'. "
System.Data.SqlClient.SqlError: RESTORE cannot operate on database 'Database' because it is configured for database mirroring. Use ALTER DATABASE to remove mirroring if you intend to restore the database.

EDIT:Providing a more complete example:

Function foo {
    #Define Trap at top. Any exceptions within this function will automatically call this block
    Trap {
            Write-Host 'Caught an exception!' -ForegroundColor Red
            $error = $_.Exception
            write-Host $error.Message -ForegroundColor Red
            continue
        }
        $exception = [System.IO.IOException] "Dude, there's no file there!";

        Write-Host 'Before exception'
        throw $exception
        Write-Host 'After Exception'    
        }
#Call our Exception handling function! 
foo