BoolToVisibilityConverter In WPF

BoolToVisibilityConverter这个转换器用于判断 bool 转 Collapsed(不占空间) 还是Hidden(占空间)。

[ValueConversion(typeof(bool), typeof(Visibility))]

    public class BoolToVisibilityConverter : IValueConverter

    {

        public BoolToVisibilityConverter()

            : this(true)

        {

        }

        public BoolToVisibilityConverter(bool collapsewhenInvisible)

            : base()

        {

            CollapseWhenInvisible = collapsewhenInvisible;

        }

        public bool CollapseWhenInvisible { get; set; }

        public Visibility FalseVisible

        {

            get

            {

                if (CollapseWhenInvisible)

                {

                    return Visibility.Collapsed;

                }

                else

                {

                    return Visibility.Hidden;

                }

            }

        }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

        {

            if (value == null)

                return Visibility.Visible;

            return (bool)value ? Visibility.Visible : FalseVisible;

        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

        {

            if (value == null)

                return true;

            return ((Visibility)value == Visibility.Visible);

        }

    }

使用：

  <converter:BoolToVisibilityConverter CollapseWhenInvisible="False" x:Key="_BoolToVisibilityConverter"/>

CollapseWhenInvisible="False" 为占空间，

CollapseWhenInvisible="True" 为不占空间，

默认 CollapseWhenInvisible="True" 。