Avalonia/samples/ControlCatalog/Models/GDPValueConverter.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using Avalonia.Data.Converters;
using Avalonia.Media;

namespace ControlCatalog.Models
{
    public class GDPValueConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is int gdp)
            {
                if (gdp <= 5000)
                    return Brushes.Orange;
                else if (gdp <= 10000)
                    return Brushes.Yellow;
                else
                    return Brushes.LightGreen;
            }

            return value;
        }

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