組多個轉換器 IValueConverter

該轉換器將多個轉換器連結在一起。

public class ValueConverterGroup : List<IValueConverter>, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return this.Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, culture));
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

在此示例中，EnumToBooleanConverter 的布林結果用作 BooleanToVisibilityConverter 中的輸入。

<local:ValueConverterGroup x:Key="EnumToVisibilityConverter">
    <local:EnumToBooleanConverter/>
    <local:BooleanToVisibilityConverter/>
</local:ValueConverterGroup>

僅當 CurrentMode 屬性設定為 Ready 時，該按鈕才可見。

<Button Content="Ok" Visibility="{Binding Path=CurrentMode, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter={x:Static local:Mode.Ready}"/>