Dispatcher timer Freeze issue

Question

Hi, I want to show continuously a timer in my application in all screens. So I used DispatcherTimer with Send priority. But some times in screen navigation and some process of screens stuck the timer at UI for few milliseconds. So can anybody please guide me any common / generalized approach which I can use in application to display timer across the application without any kind of freezing issue? Regards Vipul

Amit Gupta · Answer

Hey Well freezing the UI depends upon varous factors like RAM and other process. It seems you are playing with code and try to explore how things works, thats a good thing ! As per your issue, it seems you might have to optimize other functions like Database processing Image capturing You are adding items withing 1 millisecond, try to increase the interval and yes ofcourse, use async await keywords and work with threads. Capturing image and saving it itself takes some processing, so use it on a seperate thread and in a optimize way. Do let me know, if you require any clarification . Good Luck !

vipul langalia · Answer

Below is the small application code. private DispatcherTimer _MasterTimer; private int _MasterTimerTickPeriod = 1; public MainWindow() { InitializeComponent(); this .DataContext = this ; MasterTimer = new DispatcherTimer(DispatcherPriority.Send, Dispatcher.CurrentDispatcher); MasterTimer.Interval = TimeSpan.FromMilliseconds(_MasterTimerTickPeriod); } public void AddItems2() { DataCollection.Clear(); for ( int i = 1; i { DataCollection.Add(i.ToString()); Thread.Sleep(100); if (i % 2 == 0) { IsColorChanged = true ; } else { IsColorChanged = false ; } } } private void button1_Click( object sender, RoutedEventArgs e) { StartStopMasterTimer( true ); } private void stopBtn_Click( object sender, RoutedEventArgs e) { StartStopMasterTimer( false ); } private void StartStopMasterTimer( bool start) { if (start) { _MasterTimer.Tick += TickMasterTimer; _MasterTimer.Start(); } else { _MasterTimer.Stop(); _MasterTimer.Tick -= TickMasterTimer; } } private void TickMasterTimer( object sender, EventArgs e) { TimerData = DateTime.Now.TimeOfDay; if (Progress ==100) { Progress = 0; } else { Progress++; } } private void buttonCapture_Click( object sender, RoutedEventArgs e) { AddItems2(); // Timer Stuck } Overall on some button click there are some image capture and database save operations are done. so I want to search some generalize approach to implement dispatcher timer so that DispatcherTimer do not freeze on any heavy operation. I also tried Tasks and async operation but In all screen doing it will take more time to implement. So Is there any generalize approach to implement Dispatcher Timer that can be visible across the application in all the screens so that it can be executed without any freezing issue? Regards Vipul

Amit Gupta · Answer

Can you show some screenshot or code you had done, so that we can identify the freezing issue.