CODEWITHSUNDEEP
c#xamlwindows-store-appsdispatchertimer
AgXII
AgXII

Reputation: 13

DispatcherTimer will increasing Interval for every time it's used

I followed an example from Head First C# on DispatcherTimer.

First time I press the button the ticker will increase by 1 second, but the next time I click on the button the ticker will increase by 2 seconds for every second/tick. Third time ticker increases with 3 seconds and so on (1 second is added for every button press).

Why is that and how to i "reset" the ticker Interval so it will only increase by 1 second every time?

Here is code:

DispatcherTimer timer = new DispatcherTimer();
    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        timer.Tick += timer_Tick;
        timer.Interval = TimeSpan.FromMilliseconds(1000);
        timer.Start();
        CheckHappiness();
    }
    int i = 0;
    void timer_Tick(object sender, object e)
    {
        ticker.Text = "Tick #" + i++;
    }

    private async void CheckHappiness()
    {
        ... code ..
        timer.Stop();
    }
   }
  }

Cheers!

Upvotes: 1

Views: 1005

Answers (1)

Lofbergio
Lofbergio

Reputation: 26

timer.Tick += timer_Tick;

This line adds the method to the eventhandler everytime you press the button; in which you do an i++ which increases i by one. When you have two methods doing that at the same time (since the timer ticks on your interval) then you get an increase by two every tick of the timer.

Upvotes: 1

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