Can a c# service crash if there is a catch all

I have a service that is started using a start routine surrounded by a try catch block as below.

    protected override void OnStart(string[] args)
    {
        try
        {
            Program.Start();
        }
        catch (Exception e)
        {
            Logger.Error("Exception during Service Start");
        }
    }

Occasionally on some machines (1/100) it will occasionally print out the last line of Program.Start (a log message) and then fail with no log messages or event log messages. Sho开发者_StackOverflow中文版uld this be possible?

Thanks

EDIT: The service does kick off a few other threads but they are encapsulated in the same manner

EDIT: The Logger is a wrapper for log4net - it's working very reliably on a lot (100+) of machines (though yes it possibly the cause)

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The service could crash if an exception is thrown out of a started thread but not caught.

Are you adding a handler to each app domain unhandled exception?

eg:

  AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler( CurrentDomain_UnhandledException );

EDIT Also, you have the Application.ThreadException event which i forgot to mention: http://msdn.microsoft.com/en-us/library/system.windows.forms.application.threadexception.aspx

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If the program crashes or an exception is thrown from try block, then for sure youll get Logger.Error log info but not the eventlog from system. If service crash or an unhandled exception occurs, then only eventlog on service is logged.

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Yes it could be possible. For instance, a StackOverflowException cannot be catched since .NET 2.0 (see the MSDN article about it).

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I am not clear on your question but if you are asking whether your app can crash with a skeleton like that, the chances are very less. Since you have a catch all block almost all kinds of exceptions would be caught and thus your program would end gracefully.

How ever if its a repetive scenario that you are aware of it'd be better to handle it the known way then achieve what you want with an exception as generally execptions for times when something unknown might occur.

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Can you put the call to your Logger component in a try-catch block and let us know what happens? Are you able to monitor your service without the Logger component (i.e., based on whatever ouput the service is supposed to be produce - like DB updates)?

Try writing to the event log directly if the call to your Logger component fails. Put this in a try catch block as well. Since the Logger successfully wrote the last line in Program.Start(), it may be something related to unsuccessfully attempting to dispose a resource or something similar, and this is not getting logged.