private IBook ConvertJsonBook(BookJson bookJson) { IBook book = new Book.Book(bookJson.Title); foreach (var item in bookJson.Paragraphs) { IParagraph paragraph = new Paragraph.Paragraph(item.Id, item.Label, item.ColorStart, item.ColorEnd); foreach (var answer in item.Answers) { paragraph.AddAnswer(new Answer.Answer(answer.Label, answer.Id)); } book.AddParagraph(paragraph); } return(book); }