CODEWITHSUNDEEP
c#eventsmethodstimer
Letoir
Letoir

Reputation: 405

How do i fire an event after a few seconds?

I am making a application where i would like to log in with a face detection. But this is not real, its just to make ik look like its scanning. So when i press the LOG IN button, the kinect takes my picture and show me the picture, on top of it is showing me in a text that its scanning. Now i am stuck with the following issue, when i press the login button, the scanning label appears, but i would like to fire an other event that takes me to the next page, the homepage. So i want the SCANNING label appearing for 3 seconds, and then the page should change. This is what i tried, i worked with a timer, but that doesnt do annything.

    private void ActionButton_Click(object sender, System.EventArgs eventArgs)
    {

        _main.TakePicture();
        identifyBox.Source = _main.source.Clone();
        scanningLabel.Visibility = Visibility.Visible;
        _storyboard = (Storyboard)FindResource("scanningSB");
        //_storyboard.Begin();
        Start();
    }

    private void Start()
    {
        _tm = new Timer(3000);
        _tm.Elapsed += new ElapsedEventHandler(_tm_Elapsed);
        _tm.Enabled = true;
    }

    void _tm_Elapsed(object sender, ElapsedEventArgs e)
    {
        if (_tm == new Timer(3000))
        {
             ((Timer)sender).Enabled = false; 
            _main.ContentPage.Children.Clear();
            _main.ContentPage.Children.Add(_homeScreen);
        }
    }

Okay i removed the if statement, but now it fires every 3 seconds a method. How can i make it work 1 time.

Ok even this works, now i my ContentPage wont change? It gives me this error: The calling thread cannot access this object because a different thread owns it. What can be wrong?

Upvotes: 1

Views: 4644

Answers (3)

Justin Edwards
Justin Edwards

Reputation: 472

This is even simpler, and it will only run once per call, the three second timer is built in, and furthermore, it won't disable other program functionalities while it is running:

async Task Start()
{
    await Task.Delay(3000);
    _main.ContentPage.Children.Clear();
    _main.ContentPage.Children.Add(_homeScreen);
}

Upvotes: 1

techBeginner
techBeginner

Reputation: 3850

I think you can remove condition

if (_tm == new Timer(3000))

and keep it simple

void _tm_Elapsed(object sender, ElapsedEventArgs e)
{

    ((Timer)sender).Enabled = false; 

    _main.ContentPage.Children.Clear();
    _main.ContentPage.Children.Add(_homeScreen);

}

when you set _tm = new Timer(3000); it will set the time to fire event after 3 seconds..

Upvotes: 5

Lucian
Lucian

Reputation: 3554

Change the _tm_Elapse to this:

void _tm_Elapsed(object sender, ElapsedEventArgs e)
    {
        if (_tm == (sender as Timer))
        {
            _main.ContentPage.Children.Clear();
            _main.ContentPage.Children.Add(_homeScreen);
        }
    }

Edit for answering: "I just want it 1 time to fire after 3 sec"

void _tm_Elapsed(object sender, ElapsedEventArgs e)
    {
        if (_tm == (sender as Timer))
        {
            _tm.Stop();
            _main.ContentPage.Children.Clear();
            _main.ContentPage.Children.Add(_homeScreen);
        }
    }

Upvotes: 2

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