InverseBooleanConverter.cs

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using System.Globalization;
using System.Windows.Data;
 
namespace Dreamine.UI.Wpf.Converters
{
    public class InverseBooleanConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is long intValue)
            {
                return intValue == 0;
            }
            else if (value is bool booleanValue)
            {
                return !booleanValue;
            }
 
            return false;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool booleanValue)
            {
                return !booleanValue;
            }
            else if (targetType == typeof(long) || targetType == typeof(int))
            {
                return (bool)value ? 0L : 1L;
            }
 
            return 0L;
        }
    }
}