Question

I seem to have a thread issue I think, I have written a timer to return to the main screen if its on any other screen for 5 seconds. This code works fine the first time the ResetScreen() is called, but after it returns to the main screen itself, I can’t navigate to any other screen as it keeps returning to the Timer event handler.

I also tested this without the this.Dispatcher.Invoke and replaced it with a message box, and it just constant pops up about every second.

private void ResetScreen()
{
    if (!mainScreen)
    {
        myTimer = new System.Timers.Timer();
        myTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
        myTimer.Interval = 5000;
        myTimer.Start();
    }
}

private void OnTimedEvent(object source, ElapsedEventArgs e)
{
    myTimer.Stop();
    this.Dispatcher.Invoke((Action)(() =>
    {
        // show main screen
    }));    
}

Edit:
I think its just a timer issue in general. Just can’t seem to stop the timer.

Answer 1

When using System.Timers.Timer() you need to explicitly set the AutoReset property to false:

myTimer = new System.Timers.Timer();
myTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
myTimer.Interval = 5000;
myTimer.AutoReset = false;
myTimer.Start();

Check out the documentation and examples on MSDN.