WPF MVVM Radio buttons on ItemsControl

Question

I\'ve bound enums to radio buttons before, and I generally understand how it works. I used the alternate implementation from this question: How to bind RadioButtons to an e

Answer 1

Now that I know about x:Shared (thanks to your other question), I renounce my previous answer and say that a MultiBinding is the way to go after all.

The XAML:

The viewmodel:

class Viewmodel : INPC
{
    public Viewmodel()
    {
        Choices = new List() { "one", "two", "three" };
        SelectedChoice = Choices[0];
    }

    public List Choices { get; set; }

    string selectedChoice;
    public string SelectedChoice
    {
        get { return selectedChoice; }
        set
        {
            if (selectedChoice != value)
            {
                selectedChoice = value;
                OnPropertyChanged("SelectedChoice");
            }
        }
    }
}

The converter:

public class MyConverter : IMultiValueConverter
{
    object selectedValue;
    object myValue;

    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        selectedValue = values[0];
        myValue = values[1];

        return selectedValue == myValue;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((bool)value)
        {
            return new object[] { myValue, Binding.DoNothing };
        }
        else
        {
            return new object[] { Binding.DoNothing, Binding.DoNothing };
        }

    }
}