WPF-Demo/Waaagh/Converters/IsCollapsedConverter.cs

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

namespace Waaagh.Converters {
    internal class IsCollapsedConverter: MarkupExtension, IValueConverter {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            if (value == null || parameter == null) {
                return Visibility.Visible;
            }
            if (value.GetType().Equals(parameter.GetType()) == false) {
                return Visibility.Visible;
            }
            if (value.Equals(parameter) == false) {
                return Visibility.Visible;
            }

            return Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            throw new NotImplementedException();
        }

        public override object ProvideValue(IServiceProvider serviceProvider) {
            return this;
        }
    }
}