Determining checked Radiobutton from groupbox in WPF following MVVM

Question

I have a groupbox with some radiobuttons. How do I get to know which one which is checked? I am using WPF and following MVVM.

Answer 1

If you use Tag property on options buttons (boolean, integer, strings) like in his XAML

Then you can use following function to get selected value (button)

int priority = SelectedRadioValue(0, rP0, rP1, rP2, rP3);

where

public T SelectedRadioValue(T defaultValue, params RadioButton[] buttons)
{
    foreach (RadioButton button in buttons)
    {
        if (button.IsChecked == true)
        {
            if (button.Tag is string && typeof(T) != typeof(string))
            {
                string value = (string) button.Tag;
                return (T) Convert.ChangeType(value, typeof(T));
            }

            return (T)button.Tag;
        }
    }

    return defaultValue;
}