【WPF】值是枚举的RadioButton 绑定问题

<RadioButton Content="单打热身" GroupName="wramupType" IsChecked="{Binding TrainType, Converter={StaticResource RadioButtonConverter},ConverterParameter=0}"/>
<RadioButton Content="双打热身" GroupName="wramupType" IsChecked="{Binding TrainType, Converter={StaticResource RadioButtonConverter},ConverterParameter=1}" />

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
MatchTrainType s = (MatchTrainType)value;
return s == (MatchTrainType)int.Parse(parameter.ToString());
}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
bool isChecked = (bool)value;
if (!isChecked)
{
return null;
}
return (MatchTrainType)int.Parse(parameter.ToString());
}