怎么正确获取dataGridView中的数据

private List<Book> returnBook()
        {
             int n = dataGridView1.RowCount;
            Book b = null;
            for (int x = 0; x < n - 1; x++)
            {
                try
                {
                    int bookId = int.Parse(dataGridView1.Rows[x].Cells[0].ToString());
                    string bookName = dataGridView1.Rows[x].Cells[1].ToString();
                    int bookPrice = int.Parse(dataGridView1.Rows[x].Cells[2].ToString());
                    b = new Book(bookId,bookName,bookPrice);
                }
                catch (Exception xe)
                {
                    MessageBox.Show(xe.Message);
                }
              
                lbo.Add(b);
            }
            return lbo;
        }

 

最后显示的是你添加的数据类型不正确.请各位高手帮帮我啊!