Mastering Windows PowerShell Scripting - Third Edition

catch

catch is used to respond to terminating errors raised within try. catch can be used to respond to any exception, or a specific set of exception types. Each of the following is valid, if incomplete:

try { } catch { 'Catches any exception' } 
try { } catch [ExceptionType] { 'Catch an exception type' } 
try { } catch [ExceptionType1], [ExceptionType2] { 
    'Catch exception type 1 and 2' 
} 

In the following example, calling the ToString method on the null variable will throw an exception that triggers catch:

try { 
    $null.ToString() 
} catch { 
    Write-Host 'This exception has been handled' 
} 

When working with catch, the error record that was thrown is made available by using either the $_ variable or $PSItem:

try { $null.ToString() } catch { Write-Host ...