CODEWITHSUNDEEP
c#windows-phone-8windows-8windows-8.1windows-phone-8.1
sunder
sunder

Reputation: 1843

wp8.x and windows 8 timer issues

I am working on a simple quiz app, where I am showing time elapsed with combination or timer and stop watch. But timer is not reliable, it stop updating after couple of seconds or update slow with lag in time.

private void StartChallenge()
    {
        LoadQuestion();
        System.Threading.Timer t = new System.Threading.Timer(new System.Threading.TimerCallback(updateTime), null, 0, 1000); //start timer immediately and keep updating it after a second
        stopWatch = new System.Diagnostics.Stopwatch();
        stopWatch.Start();
    }

    private async void updateTime(object state)
    {
        TimeSpan ts = stopWatch.Elapsed;
        await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => txtTimeElapsed.Text = String.Format("{0:00}:{1:00}:{2:00} elapsed", ts.Hours, ts.Minutes, ts.Seconds));
    }

Is there anything wrong with above code. But I don't see timer working reliably in app.

Anyone faced similar problem. Is any other timer I can use for UI.

Thanks

Upvotes: 0

Views: 645

Answers (2)

w.b
w.b

Reputation: 11228

To update the UI in Windows Runtime you should use DispatcherTimer - it ticks on the UI thread:

http://msdn.microsoft.com/en-us/library/windows/apps/xaml/windows.ui.xaml.dispatchertimer.aspx

Stopwatch sw;
DispatcherTimer timer;

public MainPage()
{
    this.InitializeComponent();

    this.NavigationCacheMode = NavigationCacheMode.Required;

    sw = new Stopwatch();
    timer = new DispatcherTimer();
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    sw.Start();

    timer.Interval = TimeSpan.FromSeconds(1);
    timer.Tick += (i, j) => { txtBlock.Text = sw.Elapsed.ToString(); };
    timer.Start();    
}

Upvotes: 1

Amit Bhatiya
Amit Bhatiya

Reputation: 2621

You can try this. It would update timer at interval of One Second and also Update the TimerTextBlock

public void LoadTimer()
{
    int sec = 0;
    Timer timer = new Timer((obj) =>
    {
        Dispatcher pageDispatcher = obj as Dispatcher;

        pageDispatcher.BeginInvoke(() =>
        {
            sec++;
            TimerTextBlock.Text = sec.ToString();
        });

    }, this.Dispatcher, 1000, 1000);
}

Upvotes: 0

Related Questions