More elegant way of checking if a RadioButton is checked in C#

Question

I'm working on a Winforms app and I have 5 radio buttons. I need to know which one is checked. Is there a better/more compact way of doing this in C#?

For now I have this:

if (rbtnArgent.Checked)
    return "Silver";
else if (rbtnBleuF.Checked)
    return "Dark Blue";
else if (rbtnBleuP.Checked)
    return "Light Blue";
else if (rbtnJaune.Checked)
    return "Yellow";
else
    return "Pink";

It's working but maybe i will need to add more radio buttons to my form in the future...

Answer 1

Consider setting the Tag property to a color than use the following code to get the checked RadioButton.

public static class ControlExtensions
{
    public static IEnumerable<T> Descendants<T>(this Control control) where T : class
    {
        foreach (Control child in control.Controls)
        {
            if (child is T thisControl)
                yield return thisControl;
            if (!child.HasChildren) continue;
            foreach (T descendant in Descendants<T>(child))
                yield return descendant;
        }
    }
    public static RadioButton RadioButtonChecked(this Control control, bool @checked = true)
        => control.Descendants<RadioButton>().ToList()
            .FirstOrDefault((radioButton) => radioButton.Checked == @checked);

    public static string GetColor(this RadioButton radioButton) 
        => radioButton.Tag.ToString();
}

Usage in a Button Click event

var rb = this.RadioButtonChecked();

if (rb is not null)
{
    MessageBox.Show(rb.GetColor());
}
else
{
    MessageBox.Show("Make a selection");
}