c# async in wpf
private async void ButtonClick(object sender, RoutedEventArgs e) { // modify UI object in UI thread txt.Text = "started"; // run a method in another thread await HeavyMethod(txt); // <<method execution is finished here>> // modify UI object in UI thread txt.Text = "done"; } // This is a thread-safe method. You can run it in any thread internal async Task HeavyMethod(TextBox textBox) { while (stillWorking) { textBox.Dispatcher.Invoke(() => { // UI operation goes inside of Invoke textBox.Text += "."; // Note that: // Dispatcher.Invoke() blocks the UI thread anyway // but without it you can't modify UI objects from another thread }); // CPU-bound or I/O-bound operation goes outside of Invoke // await won't block UI thread, unless it's run in a synchronous context await Task.Delay(51); } }
