WPF Radiobutton (two) (binding to boolean value)

Question

Hi !

I have a property of type boolean presented with checkbox.

I want to change that to two radiobuttons that bind on the same property presenting the value true/false.

How can i do that ?

thanx

Answer 1

You can use a value-converter that reverts the boolean value:

With that converter, bind one Checkbox.IsChecked-property to the boolean value without the converter and one CheckBox.IsChecked-property with the converter. This should do the trick.

Here the code for such a converter. I have copied it from here and added some lines of code. There you will find more information about.

public class BoolToOppositeBoolConverter : IValueConverter {
    public object Convert(object value, Type targetType, object parameter,System.Globalization.CultureInfo culture) {
        if (targetType != typeof(bool)) {
            throw new InvalidOperationException("The target must be a boolean");
        }
        if (null == value) {
            return null;
        }
                    return !(bool)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter,System.Globalization.CultureInfo culture) {
        if (targetType != typeof(bool)) {
            throw new InvalidOperationException("The target must be a boolean");
        }
        if (null == value) {
            return null;
        }
        return !(bool)value;
    }
} 

To use it, declare it in the resource-section.

 <local:BoolToOppositeBoolConverter x:Key="BoolToOppositeBoolConverter_ValueConverter"/>

And the use it in the binding as a static resource:

<CheckBox IsChecked="{Binding YourProperty}" />
<CheckBox IsChecked="{Binding YourProperty,Converter={StaticResource BoolToOppositeBoolConverter_ValueConverter}}" />

Please note, the converter is only a simple example. Implement it neatly if you want to use it in productive code. I have not tested it. Make a comment if its not working.

Answer 2

<RadioButton GroupName="Group1" IsChecked="{Binding PropertyValue}" Content="Yes" />
<RadioButton GroupName="Group1"  Content="No" IsChecked="{Binding PropertyValue, Converter={StaticResource BoolInverterConverter}}" >

public class BoolInverterConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is bool)
        {
            return !(bool)value;
        }
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is bool)
        {
            return !(bool)value;
        }
        return value;
    }

    #endregion
}