RadioButton and switch

Question

I have many radio buttons so I end up with code that look like this

if (rbFrenchImp.Checked)
{
}
else if (rbFrenchMet.Checked)
{
}
else if (rbEnglishImp.Checked)
{
}
else if (rbFrenchEuro.Checked)
{
}
//etc...

So I was wondering, is it possible to use a switch case with radio button? If yes how?

Answer 1

Yes you can:

You subcribe the same CheckChanged(or similar) event handler to each of the radio buttons. Then you put some code like this:

RadioButton btn = sender as RadioButton;
if(btn!= null && btn.IsChecked)
{
   Switch(btn.Name)
   {
      case "rbFrenchImpl":
      break;
      ...
   }
}

This works on all type of frameworks.

Answer 2

Feels slightly hacky, but you could set up a Dictionary<RadioButton, Action> containing a mapping between RadioButton controls and corresponding methods (that are parameterless void methods, matching the Action delegate signature):

Dictionary<RadioButton, Action> _rbMethods = new Dictionary<RadioButton, Action>();

When loading the form, add the buttons and corresponding methods to the map:

_rbMethods.Add(rbFrenchImp, FrenchImpAction);
_rbMethods.Add(rbFrenchMet, FrenchMetAction);
_rbMethods.Add(rbEnglishImp, EnglishImpAction);

Then, you can quite easily invoke corresponding methods for the checked radio button (or buttons, in case they are in different groups):

foreach (RadioButton key in _rbMethods.Keys.Where(rb => rb.Checked))
{
    _rbMethods[key]();
}