Question

How can I send a variable with a newly created EventHandler?
The code I have is something like:

for (int i = 0; i < 5; i++)
{   
    Button buttonX = new Button();
    buttonX.Location = new Point(0, 0 + offset);
    buttonX.Size = new Size(310, 48);
    buttonX.Click += new EventHandler(buttonClick);
}

private void buttonClick(object sender, EventArgs e)
{
    MessageBox.Show();
}

How can I can make it like

buttonX.Click += new EventHandler(buttonClick , i);

private void buttonClick(object sender, EventArgs e, int i)
{
    MessageBox.Show(i.toString());
}

Answer 1

You would create a class derived from EventArgs that carries the additional data points that you want.

http://msdn.microsoft.com/en-us/library/system.eventargs.aspx

So instead of just using EventArgs you would create an EventArgs for the event you are raing.

public class ButtonClickedEventArgs : EventArgs
{
    public int EventInteger { get; private set; }

    public ButtonClickedEventArgs(int i)
    {
        EventInteger = i;
    }
}

And then when you raise the event you would create the ButtonClickedEventArgs class and pass that with the EventHandler.