1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:

<Window x:Class="WPFRadioButtonBindingtest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:c="clr-namespace:WPFRadioButtonBindingtest"     <-------ist das so korrekt?
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <RadioButton GroupName="group1" IsChecked="{Binding Path=IsTrue,Converter={StaticResource myConverter}, ConverterParameter=option1}" Content="yes" Height="16" HorizontalAlignment="Left" Margin="62,102,0,0" Name="radioButton1" VerticalAlignment="Top" />
        <RadioButton GroupName="group1" IsChecked="{Binding Path=IsTrue, Converter={StaticResource myConverter}, ConverterParameter=option2}" Content="no" Height="16" HorizontalAlignment="Left" Margin="62,132,0,0" Name="radioButton2" VerticalAlignment="Top" />
    </Grid>
    <Window.Resources>
        <c:EnumMatchToBooleanConverter x:Key="myConverter"></c:EnumMatchToBooleanConverter>
    </Window.Resources>
</Window>                    

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:

namespace WPFRadioButtonBindingtest
{
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        MyProperties MyProp = new MyProperties();

        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = MyProp;
        }
    }

    public class EnumMatchToBooleanConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || parameter == null)
                return false;

            string checkValue = value.ToString();
            string targetValue = parameter.ToString();
            return checkValue.Equals(targetValue, StringComparison.InvariantCultureIgnoreCase);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || parameter == null)
                return null;

            bool useValue = (bool)value;
            string targetValue = parameter.ToString();
            if (useValue)
                return Enum.Parse(targetType, targetValue);

            return null;
        }
    }


    public class MyProperties : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private bool _IsTrue = true;
        public bool IsTrue
        {
            get { return _IsTrue; }
            set
            {
                _IsTrue = value;
            }
        }

        private void FirePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}