ModernWpfPlayground/src/Controls/PropertyPresenter/EnumToItemSourceConverter.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Windows.Data;
using System.Windows.Markup;

namespace Controls
{
    /// <summary>
    /// Converts enums to a List with KeyValuePairs.
    /// </summary>
    public class EnumToItemSourceConverter : MarkupExtension, IValueConverter
    {
        private static EnumToItemSourceConverter? _converter;

        object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not Enum) return Binding.DoNothing;
            return (from object enumValue in Enum.GetValues(value.GetType())
                    select new KeyValuePair<string, object>(GetDescription(enumValue), enumValue)).ToList();
        }

        /// <summary>
        /// Returns the content of a description attribute of an enum.
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        private static string GetDescription(object value)
        {
            if (value is not Enum enumValue) return string.Empty;
            var descriptionAttribute = enumValue.GetType()
              .GetField(enumValue.ToString())?
              .GetCustomAttributes(false)
              .OfType<DescriptionAttribute>()
              .FirstOrDefault();

            return descriptionAttribute?.Description ?? value.ToString() ?? string.Empty;
        }

        object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return Binding.DoNothing;
        }

        public override object ProvideValue(IServiceProvider serviceProvider) => _converter ??= new EnumToItemSourceConverter();
    }
}