InverseBooleanConverter.cs

using System;
using System.Globalization;
using System.Windows.Data;

namespace Sharp.Utils.Wpf
{
    /// <summary>
    /// Converts a boolean value to its inverse.
    /// </summary>
    [ValueConversion(typeof(bool), typeof(bool))]
    public class InverseBooleanConverter : IValueConverter
    {
        /// <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>The converted value.</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is bool))
                throw new ArgumentException("value must be a boolean.", "value");
            return !(bool)value;
        }

        /// <summary>
        /// Converts a value.
        /// </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>The converted value.</returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is bool))
                throw new ArgumentException("value must be a boolean.", "value");
            return !(bool)value;
        }
    }
}