Question

How do I hook a custom function, so that on label click, the same function would run and pass the parameters?

List<int> _list1 = new List<int>(); //1, 2, 3, 4, 5
    foreach (var item in _list1)
    {
        Label lb = new Label { Text = item.ToString() };
    lb.Click += //custom function and pass the parameter item

    }

private void CustomFunctionOnClick(int s)
{
textBox1.Text = s.ToString();
}

-> I can’t hook delegates with the click event of label.
-> For the other way round, I could have a CustomEventArgs class that would pass the data to the event (object sender, CustomEventArgs e), and I could do run same code in the event.
But the click event delegate does not define CustomEventArgs as the parameter for the event?

Then, how is this done?

Answer 1

List<int> _list1 = new List<int>(); //1, 2, 3, 4, 5

foreach (var item in _list1)
{
    // take copy of loop variable to avoid closing over the loop variable
    int i = item; 
    Label lb = new Label { Text = item.ToString() };
    lb.Click += (x,y) => CustomFunction(i);
}

void CustomFunction(int item)
{
}