public void AddThreadSafe(ConcurrentBag <Livro> livros)
        {
            ScrapaContext scrapaContext = new ScrapaContext();

            scrapaContext.Livros.AddRange(livros);
            scrapaContext.SaveChanges();
            scrapaContext.Dispose();
        }
        public bool Exists(string bookName, string bookAuthor)
        {
            ScrapaContext scrapaContext = new ScrapaContext();
            var           output        = scrapaContext.Livros.Any(b => (string.Compare(bookName, b.Nome, StringComparison.InvariantCultureIgnoreCase) == 0) && (string.Compare(bookAuthor, b.Autor, StringComparison.InvariantCultureIgnoreCase) == 0));

            scrapaContext.Dispose();
            return(output);
        }