How to reset a DispatcherTimer?

Question

Those are my declarations and methods of DispatcherTimer:

private DispatcherTimer DishTimer;
private TimeSpan SpanTime;
private void InitTimer()
{

    DishTimer = new DispatcherTimer();
    DishTimer.Interval = new TimeSpan(0, 0, 0, 1);
    DishTimer.Tick += TimerOnTick;

}
private void TimerOnTick(object sender, object o)
{
    SpanTime = SpanTime.Add(DishTimer.Interval);
    Duration.DataContext = SpanTime;
}

This is where i call it:

private void CaptureButton_Click(object sender, RoutedEventArgs e)
{
    if ((string) CaptureButton.Content == "Capture")
    {

        CaptureAudio();
        InitTimer();
        DishTimer.Start();

        ProgressRing.IsActive = true;
        CaptureButton.Content = "Stop";
    }
    else
    {
        StopCapture();
        DishTimer.Stop();
        ProgressRing.IsActive = false;
        CaptureButton.Content = "Capture";
    }

}

and here is my xaml code for showing the timer:

<TextBlock Name="Duration" Text="{Binding}"  HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="24"></TextBlock>

I am making a voice recording app and i want everytime the user press capture to show a timer. My problem here is that i can't reset it

ispiro · Accepted Answer · 2018-09-14 13:44:07Z

27

Calling Stop() and then Start() should restart the Timer Interval.

edited Sep 14, 2018 at 13:44

ispiro

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answered Nov 27, 2014 at 17:31

Chubosaurus Software

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8 Comments

Romasz Over a year ago

You don't need to call Stop(), calling Start() will be enough to reset the timer.

Chubosaurus Software Over a year ago

True, but it doesn't make sense reading the code like that. That is an assumption (shortcut) lazy programmers make and will be weird to anyone new reading the code.

kazama Over a year ago

where exactly call Stop() ? i tried between InitTimer() and Start() but it continues counting from where it stopped.

Chubosaurus Software Over a year ago

@KazaMaster That is because of another problem. Your math is incorrect. You never reset SpanTime = 0, you keep adding to it...

marbel82 Over a year ago

@Romasz To reset the timer, you need to call Stop() and Start() .NET Reference Source: DispatcherTimer.Start()

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chrosey · Accepted Answer · 2014-11-27 17:41:06Z

10

You need to (re)set your SpanTime when you press the Capture-button. just do

SpanTime = new TimeSpan();

it should be reset to zero and start over until you press the button again.

answered Nov 27, 2014 at 17:41

chrosey

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1 Comment

chrosey Over a year ago

i don't really understand this downvote. sure i didn't answer his question title. but in his description, it looks like he wants to reset the time that is shown for the user. so i supposed my answer is what he was looking for

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