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Error Handling


Error Handling


there is a $error variable that has a default limit of 256 (defined by $MaximumErrorCount)
the most recent error will always be $error[0]
$error
$error[0]
$error.count

you can use –errorvariable on most cmdlets to define your own error variable
Get-WmiObject -Class win32_ComputerSystem -ErrorVariable $WMIError



$?                  #Was the last command successful true/false
$LastExitCode       #error code returned by external command or script (ping blah)


Try Catch Finally


$foo = {} | Select Name, Ram, Tier
$foo.Name = "test"
$foo.Ram = 128
$foo.Tier = 0


$blah = $foo | select Name, @{Name="ratio";Expression=
{    
    try {
        ($_.Ram / $_.Tier)
    }    
    catch [System.DivideByZeroException] { 
        "Please don’t divide by 0!"
    }
    finally {
       # Cleanup
    }
}} 

$blah

  
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