Get index of a selected RadioButton in radioGroup

Question

i want to find an index of a selected RadioButton in RadioGroup. I attached next single method to each RadioButton in the group:

private void radio_button_CheckedChanged(object sender, EventArgs e){
    if (sender.GetType() != typeof(RadioButton)) return;
    if (((RadioButton)sender).Checked){
        int ndx = my_radio_group.Controls.IndexOf((Control)sender);
        // change something based on the ndx
    }
}

It is important to me that lower radioButton must have lower index, starting from zero. And seems it is working, but i am not sure if this is a good solution. Maybe there is more betufilul way to do the same.

Answer 1

This will give you the Checked RadioButton:

private void radioButtons_CheckedChanged(object sender, EventArgs e)
{
    RadioButton rb = sender as RadioButton;
    if (rb.Checked)
    {
        Console.WriteLine(rb.Text);
    }
}

Any indices in the Controls collection of its Parent are highly volatile.

You could access it like this: rb.Parent.Controls.IndexOf(rb) If you want a relatively stable ID besides the Name and the Text you can put it in the Tag.

Obviously you need to hook up this event to all the RadionButtons in the group.

No type checks are really necessary (or imo recommended,) as only a RadioButton can (or rather: must ever) trigger this event.