internal static class EnumHelper
    {
        public static IReadOnlyDictionary<TEnum, string> WithDescriptions<TEnum>() where TEnum : struct
        {
            if (!typeof(TEnum).IsEnum)
            {
                throw new ArgumentException("Must be enum", nameof(TEnum));
            }

            var query = from f in typeof(TEnum).GetFields(BindingFlags.Public | BindingFlags.Static)
                        let attr = f.GetCustomAttribute<DescriptionAttribute>()
                        let value = (TEnum)f.GetValue(null)
                        select (value, attr.Description);

            return query.ToDictionary(T => T.value, T => T.Description);
        }
    }