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POException Handling not working in Parallel.ForEach
 

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  1. POException Handling not working in Parallel.ForEach
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    <p><em>Problem situation</em></p> <p>In my project I call into PowerShell to retrieve a list of organizations that are configured in Exchange 2010. Then I have to do something for each organization. Invoking PowerShell is <em>sloooow</em>, so if I'd to all the operations in sequence, it would take minutes. You can, however, create a PowerShell Runspace Pool and execute commands parallel, which saves a lot of time. So this is what I did:</p> <pre><code>public void MainMethod() { var organizations = exchangeRepository.GetOrganizations(); Parallel.ForEach( organizations, organization =&gt; { try { exchangeRepository.DoSomethingWithAnOrganization(organization); } catch (Exception ex) { ... } } ); } </code></pre> <p><em>Problem</em></p> <p>This works like a charm with one exception. The DoSomethingWithAnOrganization method has a try-catch and can handle some exceptions. However, whenever an Exception occurs, it isn't handled by the catch in the DoSomething-method, but immediately jups to the catch statement of the MainMethod.</p> <p>(Note: The catch-statement of the DoSomething-method is called fine if I simple use foreach(... in ...) in stead of Parallel.ForEach).</p> <p><em>Question</em></p> <p>Why can't I handle the exception in the DoSomething-method? Is there a way to DoSomething parallel differently so the catch of that method is called if an Exception occurs?</p> <p>Thank you!</p> <hr> <p>This is the DoSomething-method:</p> <pre><code>public IEnumerable&lt;Mailbox&gt; Invoke(string organizationName) { try { var command = new PSCommand() .AddCommand("Get-Mailbox") .AddParameter("Organization", organizationName); var result = Invoke(command); var mailboxes = from mailbox in result.Results select new Mailbox() { Organization = organizationName, Name = (string)mailbox.Properties["Name"].Value, Identity = mailbox.Properties["Identity"].Value.ToString(), Plan = mailbox.Properties["MailboxPlan"].Value == null ? null : (string)mailbox.Properties["MailboxPlan"].Value .GetType().GetProperty("Name") .GetValue(mailbox.Properties["MailboxPlan"].Value, null), }; return mailboxes; } catch (Exception ex) { Log.Error(ex.Message, ex); throw new Exceptions.ReportingServiceException(Exceptions.ExceptionType.Technical, ex.Message, ex); } } </code></pre>
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    1. USGuillaume Hanique
    1. USGuillaume Hanique
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    1. COCan you show the try/catch in the DoSomethingWithAnOrganisation? Perhaps that's where the problem lies.
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      1. POException Handling not working in Parallel.ForEach
      1. USColin Mackay
    2. COIs the catch block in DoSomethingWithAnOrganisation more specific that the catch in the anonymous method? The catch in the anonymous method will catch everthing as it is the base exception class.
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      1. POException Handling not working in Parallel.ForEach
      1. USColin Mackay
    3. CO@Colin: Thank you for your reply. I added the DoSomethingWithAnOrganizationMethod (here called Invoke). If an exception occurs in the Invoke method, it is not caught by the catch statement, so the error is not logged, nor is a ReportingServiceException thrown.
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      1. POException Handling not working in Parallel.ForEach
      1. USGuillaume Hanique
 

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