WPF Tips: Data Binding Converter一例：bool與Visibility之間的轉換

    /// <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    }