SelectedItemsCountRangeConverter.cs

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using System.Collections;
using System.Globalization;
using System.Windows.Data;
 
namespace Dreamine.UI.Wpf.Converters;

public class SelectedItemsCountRangeConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var count = value is ICollection collection ? collection.Count : 0;
 
        if (parameter is string paramString && !string.IsNullOrEmpty(paramString))
        {
            bool bCheck = false;
 
            var parts = paramString.Split('-');
            if (int.TryParse(parts[0], out int min))
            {
                bCheck = count >= min;
            }
            if (parts.Length == 2 && int.TryParse(parts[1], out int max))
            {
                bCheck = bCheck && count <= max;
            }
 
            return bCheck;
        }
 
        return false;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        => Binding.DoNothing;
}