WPF Tips: Data Binding Converter一例：bool与Visibility之间的转换

/// <summary>
/// Value converter between bool and Visibility
/// </summary>
[ValueConversion(typeof(bool), typeof(Visibility))]
public class VisibilityConverter : IValueConverter
{
#region IValueConverter Members
/// <summary>
/// Converts a value.
/// </summary>
/// <param name="value">The value produced by the binding source.</param>
/// <param name="targetType">The type of the binding target property.</param>
/// <param name="parameter">The converter parameter to use.</param>
/// <param name="culture">The culture to use in the converter.</param>
/// <returns>
/// A converted value. If the method returns null, the valid null value is used.
/// </returns>
public object Convert(
object value,
Type targetType,
object parameter,
CultureInfo culture)
{
if ((bool)value)
{
return Visibility.Visible;
}
else
{
return Visibility.Collapsed;
}
}

/// <summary>
/// Converts a value back.
/// </summary>
/// <param name="value">The value that is produced by the binding target.</param>
/// <param name="targetType">The type to convert to.</param>
/// <param name="parameter">The converter parameter to use.</param>
/// <param name="culture">The culture to use in the converter.</param>
/// <returns>
/// A converted value. If the method returns null, the valid null value is used.
/// </returns>
public object ConvertBack(
object value,
Type targetType,
object parameter,
CultureInfo culture)
{
return (Visibility)value == Visibility.Visible;
}
#endregion IValueConverter Members
}