BeWoPlaner/BeWo/Converter/CollectionCountToVisibilityConverter.cs

using System;
using System.Collections;
using System.Globalization;
using System.Linq;
using System.Windows;
using System.Windows.Data;

namespace BeWo.Converter
{
    public class CollectionCountToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            try
            {
				int count;

				switch (value)
				{
					case int i:
						count = i;
						break;
					case ICollection collection:
						count = collection.Count;
						break;
					case IEnumerable enumerable:
						count = enumerable.Cast<object>().Count();
						break;
					default:
						return Visibility.Collapsed;
				}

				if (parameter is string s && s == "reverse")
				{
                    return count > 0 ? Visibility.Collapsed : Visibility.Visible;
				}

				return count > 0 ? Visibility.Visible : Visibility.Collapsed;
            }
            catch (Exception)
            {
                return Visibility.Collapsed;
            }
        }

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