PocketBook/sources/ViewModel/BookVM.cs

using System;
using Model;
using MyToolkitMVVM;

namespace ViewModel
{
	public class BookVM : BaseViewModel<Book>
    { 
        public string Title
		{
			get =>Model.Title;
			set =>SetProperty(Model.Title,value,v=>Model.Title=v);
		}

        public string Image
        {
            get => Model.ImageLarge;
            set { }
        }

        public Status BookStatus
        {
            get => Model.Status;
            set
            {
                SetProperty(Model.Status, value, v => Model.Status = v);
            }
        }

        public List<Author> BookAuthors
        {
            get => Model.Authors;
            set
            {
                SetProperty(Model.Authors, value, v => Model.Authors = v);
            }
        }

        public string BookFirstAuthor { get; private set; }

        public BookVM(Book book)
        {
            Model = book;
            Title = book.Title;
            BookStatus = book.Status;
            BookAuthors = book.Authors;
            Image = book.ImageLarge;
            if (BookAuthors.Count() > 0)
            {
                BookFirstAuthor = BookAuthors.First().Name;
            }
            else BookFirstAuthor = "Unknow";
        }
    }
}