c# - How do I get the Exception that happens in Timer Elapsed event?

Question

I'm working with Windows Forms application and hava a manager class that uses System.Timers.Timer to periodly check data from database.

How do I get the Exception that occurs in timer Elapsed eventhandler delivered into main application? If I'm using the code below, the exception get's "swallowed", and main application never gets it (even if I have handlers for ThreadException and UnHandledException).

// Main Form
Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

// Manager class
private System.Timers.Timer _timer;

    void _timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        try
        {
            doSomeDatabaseActions();
        }
        catch (Exception ex)
        {
            throw new ApplicationException("How do I get this error back into main thread...", ex);
        }
    }

Answer 1

If you don't have access to the main thread, you can throw the exception on another, non-timer thread:

catch (Exception exception)
{
    ThreadPool.QueueUserWorkItem(
        _ => { throw new Exception("Exception on timer.", exception); });
}