学步园

    /// <summary>
    /// Value converter between bool and IsChecked property value (bool?)
    /// </summary>
    [ValueConversion(typeof(bool), typeof(bool?))]
    public class IsCheckedConverter : IValueConverter
    {
        #region IValueConverter Members
        /// <summary>
        /// Converts the specified value.
        /// </summary>
        /// <param name="value">The value.</param>
        /// <param name="targetType">Type of the target.</param>
        /// <param name="parameter">The parameter.</param>
        /// <param name="culture">The culture.</param>
        /// <returns></returns>
        public object Convert(
            object value, 
            Type targetType, 
            object parameter, 
            CultureInfo culture)
        {
            return (bool)value;
        }

        /// <summary>
        /// Converts the value back.
        /// </summary>
        /// <param name="value">The value.</param>
        /// <param name="targetType">Type of the target.</param>
        /// <param name="parameter">The parameter.</param>
        /// <param name="culture">The culture.</param>
        /// <returns></returns>
        public object ConvertBack(
            object value, 
            Type targetType, 
            object parameter, 
            CultureInfo culture)
        {
            bool? isChecked = (bool?)value;
            if (isChecked == null)
            {
                return false;
            }
            else
            {
                return isChecked == true;
            }
        }
        #endregion IValueConverter Members
    }