defining event handler for Tick event of DispatcherTimer in windows 8 app

Question

I am developing an application in windows 8 Visual studio 11, and I want to define an event handler for a DispatcherTimer instance as below:

public sealed partial class BlankPage : Page
    {

        int timecounter = 10;
        DispatcherTimer timer = new DispatcherTimer();
        public BlankPage()
        {
            this.InitializeComponent();
            timer.Tick += new EventHandler(HandleTick);
        }

        private void HandleTick(object s,EventArgs e)
        {

            timecounter--;
            if (timecounter ==0)
            {
                //disable all buttons here
            }
        }
        .....
}

But I get the following Error :

Cannot implicitly convert type 'System.EventHandler' to 'System.EventHandler<object>'

I am a novice developer to widows 8 apps.

Would you please help me ?

Answer 1

almost had it :) You don't need to instantiate a new eventhandler object, you only need to point to the method that handles the event. Hence, an eventhandler.

        int timecounter = 10;
    DispatcherTimer timer = new DispatcherTimer();
    public BlankPage()
    {
        this.InitializeComponent();

        timer.Tick += timer_Tick;
    }

    protected void timer_Tick(object sender, object e)
    {
        timecounter--;
        if (timecounter == 0)
        {
            //disable all buttons here
        }
    }

Try to read up on delegates to understand events Understanding events and event handlers in C#

Answer 2

Your code is expecting HandleTick to have two Object params. Not an object param and an EventArg param.

private void HandleTick(object s, object e)

NOT

private void HandleTick(object s,EventArgs e)

This is a change that took place for Windows 8.