public IEnumerable<Book> QueryByCode(string code)
{
    var result = _bookActor.Ask<IEnumerable<Book>>(code).Result;

    return result;
}

public IEnumerable<Book> Query(DateTime startDataDateTime, DateTime endDateTime)
{
    var expression = new Func<Book, bool>(w => w.PublishDate >= startDataDateTime && w.PublishDate <= endDateTime);

    var result = _bookActor.Ask<IEnumerable<Book>>(expression).Result;
    return result;
}