Error Handling In Powershell 1.0
WindowsWindows 10 Windows Server 2012 Windows Server 2008 Windows Server 2003 Windows 8 Windows 7 Windows Vista Windows XP Exchange ServerExchange Server 2013 Exchange Server 2010 Exchange Server 2007 Exchange Server 2003 Outlook Unified Communications/Lync SharePoint Virtualization Cloud Systems ManagementSystem Center PowerShell & Scripting Active Directory & Group Policy Mobile Networking Storage TrainingOnline Training IT/Dev Connections Webcasts VIP Library Digital Magazine Archives InfoCentersIT Innovators Mobile Computing Business Now Desktop VDI All About Converged Architecture Advertisement Home > Systems Management > PowerShell & Scripting > Scripting > Error Trapping and Handling in PowerShell Error Trapping and Handling in PowerShell How to use the Trap and Try...Catch...Finally constructs Jul 20, 2010 Don Jones | Windows IT Pro EMAIL Tweet Comments 0 Advertisement Sometimes when something goes wrong in Windows PowerShell, it isn't a bad thing. That is, there are certain conditions that you can anticipate and potentially deal with, such as a missing file or a computer that can't be contacted over the network. In response, you might want to prompt the user for an action to take or just log the error so that you can try again later. Windows PowerShell makes this possible through a scheme called error trapping and handling. First, You Need an Error To trap and handle an error, you actually need one to occur. Technically, in PowerShell terminology, you need an exception to occur. That can actually be a little tricky to do, believe it or not. For example, try running the following command. It will fail, but pay attention to what happens: Get-WmiObject Win32_BIOS -comp 'localhost','not-here' First, you should see the Win32_BIOS instance from your local computer. Then, you should see an error message (unless you actually have a computer named not-here on your network). Think you've seen an exception? Wrong. In PowerShell, just because you've seen an error message doesn't mean an exception was created. You can't trap or handle an error message. You can only trap and handle exceptions. What you just saw was an example of a non-terminating exception. That is, an exception really did happen, but it wasn't so bad that the cmdlet needed to stop executing. So the cmdlet basically held the exception deep inside, suppressing its feelings of failure, and continu
Server 2016 SQL Server 2014 SQL Server 2012 SQL Server 2008 AdministrationBackup and Recovery Cloud High Availability Performance Tuning PowerShell Security Storage Virtualization DevelopmentASP.NET Entity Framework T-SQL Visual Studio Business IntelligencePower BI SQL Server Analysis Services SQL Server Integration Services SQL Server Reporting Services InfoCenters Advertisement Home > Database Administration > PowerShell > Handling Errors in PowerShell Handling Errors in PowerShell Mar 24, 2014 Allen White EMAIL Tweet Comments 0 Advertisement As DBAs, we're always working on protecting ourselves from problems by disaster recovery procedures like backups, but in our haste to get a script done, we also are prone to forget the same http://windowsitpro.com/scripting/error-trapping-and-handling-powershell concept within our code to protect the process from errors. PowerShell provides ways to manage those times when there are errors in the execution of our script so we can recover, and still get the job done. Trap Statement for Handling Errors PowerShell 1.0 supported the Trap statement for handling errors, and I still frequently use that in my scripts. PowerShell works within the .NET Framework, so errors have multiple http://sqlmag.com/powershell/handling-errors-powershell levels. It's rare that the top level error message PowerShell returns will help you solve the problem. Let's take, for example. the case where we want to use the SMO CheckTables('FAST') method, which effectively runs DBCC CHECKDB(N'AdventureWorks', REPAIR_FAST). If we run call this method without error handling, we'll get this message. Exception calling "CheckTables with "1" argument(s): "Check tables failed for Database 'AdventureWorks'." Now, that isn't very helpful at all. Here's the Trap function I frequently use. # Handle any errors that occur Trap { # Handle the error $err = $_.Exception write-output $err.Message while( $err.InnerException ) { $err = $err.InnerException write-output $err.Message }; # End the script. break } When the CheckTables('FAST') method is called, now I get the following error messages back. An exception occurred while executing a Transact-SQL statement or batch. Repair statement not processed. Database needs to be in single user mode. The error message in Figure 1 is much more useful and helps me understand exactly what the problem is and how to address it. Note, the use of the keyword "break" after the semi-colon in the trap statemen
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and not in PowerShell, Adam Weigert posted the following PowerShell function in this post: function Try{ param ( [ScriptBlock]$Command = $(throw "The parameter -Command is required."), [ScriptBlock]$Catch = { throw $_ }, [ScriptBlock]$Finally = {} ) & { $local:ErrorActionPreference = "SilentlyContinue" trap { trap { & { trap { throw $_ } &$Finally } throw $_ } $_ | & { &$Catch } } &$Command } & { trap { throw $_ } &$Finally }} # Example usage Try { echo " ::Do some work..." echo " ::Try divide by zero: $(0/0)"} -Catch { echo " ::Cannot handle the error (will rethrow): $_" #throw $_} -Finally { echo " ::Cleanup resources..."} I did a bit of testing with nested error handling and I'm comfortable enough I'm going to start rolling it out. Don't get me wrong, I LOVE PowerShell and for a version 1 product, it is amazingly functional and usable. But, I usually refer to the error handing as Trap Crap. It's not that it doesn't work... This function uses it and it works. But keep in mind, implementing your own Try Finally Catch using Trap Crap would look very similar to the Try implementation code! Can your read it? I can, but it takes too many brain cells and productive minutes to do so. Compare it to the "Example usage". Hmmm... which do you want to use. It has a bit of awkwardness because of the "parameter" nature of the scriptblocks. Stick with the "} -Finally {" formatting. You'll have to do that or use continuation marks. Until 2.0 comes out, this'll have to do. Saturday, 13 October 2007 06:19:40 (GMT Daylight Time, UTC+01:00) Comments [7] - Powershell Tracked by:"http://www.google.com/search?q=boubuylh" (http://www.google.com/search?q=boubuy...[Pingback]"http://realvideopornoo.com" (http://realvideopornoo.com)[Pingback]"http://yesihavemoneyy.com" (http://yesihavemoneyy.com)[Pingback]"http://tubepornoss.com" (http://tubepornoss.com)[Pingback]"http://blastpr.com/wiki/js/pages/wellbutrin/index.html" (http://blastpr.com/wik...[Pingback]"http://blastpr.com/wiki/js/pages/claritin/index.html" (http://blastpr.com/wiki/...[Pingback]"http://morningside.edu/mics/_notes/pages/claritin/index.html" (http://morningsi...[Pingback]"