//续借
public ActionResult BorrowAgain(int Id, Reader reader)
{
Book book = repository.FindBookById(Id);
if (repository.Borrows.FirstOrDefault(b => b.BookId == book.Id && b.ReaderId == reader.Id).WhetherToRenew == 3)
{
TempData["msg"] = string.Format("抱歉,'{0}'的续借上限次数为三次", book.Name);
}
else
{
borrowProcessor.ProcessBorrowAgain(book, reader);
}
return(RedirectToAction("Borrowing", reader));
}