PocketBook/Sources/BookApp/UseCase/AuthorsListToStringConverter.cs

using Model;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BookApp.UseCase
{
    public class AuthorsListToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is List<Author> authorsList && authorsList.Any())
            {
                return string.Join(", ", authorsList.Select(a => a.Name));
            }

            return string.Empty;
        }

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