WPF Radio button的解决方案

 WPF Radio button的解决方案

WPF中的Radio button有bug，不能进行data binding.
http://geekswithblogs.net/claraoscura/archive/2008/10/17/125901.aspx

适用于boolean type的.
1. 一个converter:
/// <summary>
/// Reference:
/// http://geekswithblogs.net/claraoscura/archive/2008/10/17/125901.aspx
/// </summary>
[ValueConversion(typeof(bool), typeof(bool))]
public class RadioButtonBooleanConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool param = bool.Parse(parameter.ToString());
        if (value == null)
        {
            return false;
        }
        else
        {
            return !((bool)value ^ param);
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool param = bool.Parse(parameter.ToString());
        return !((bool)value ^ param); ;
    }

2. How to use it:

(1) Add converter in resources:
    <RadioButtonBooleanConverter x:Key="RadioButtonBooleanConverter" />
        
(2) Use converter in RadioButton:
    <RadioButton GroupName="rbGroupNew"
IsChecked="{Binding Path=xxx, Mode=TwoWay, Converter={StaticResource RadioButtonBooleanConverter}, ConverterParameter=true}" Content="New" />
    <RadioButton GroupName="rbGroupOld" IsChecked="{Binding Path=xxxx, Mode=TwoWay, Converter={StaticResource RadioButtonBooleanConverter}, ConverterParameter=false}" Content="Old" />

3. Essential points:
(1) xxx must be dependency property;
(2) Radio button group is different, Mode should be "TwoWay", ConverterParameter=true/false;

4. If Radio buttons states are more than one:
http://www.wpftutorial.net/RadioButton.html