tp1Entity/tp1/Model2Entities/DbDataManager.cs

using DbContextLib;
using Entities;
using Model;
namespace Model2Entities
{
    public class DbDataManager : IDataManager
    {
        public Book GetBookById(long id)
        {
            List<BookEntity> books = new List<BookEntity>();
            using (var context = new LibraryContext())
            {
                foreach (var i in context.BooksSet)
                {
                    if (i.Id == id)
                    {
                        return i.ConvertToModel();
                    }
                }
                return null;
            }
        }


    }
}