/// <summary>
        /// 添加
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnAdd_Click(object sender, EventArgs e)
        {
            //获取当前dgv选择中的行图书编号
            frmBookDetail objfrm = new frmBookDetail();

            objfrm.actionflag = 1;
            DialogResult dr = objfrm.ShowDialog();

            if (dr == DialogResult.OK)
            {
                List <BookExtModel> data = bkbll.GetAllBooks();
                BindBook(data);
            }
        }
        /// <summary>
        /// 修改
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            //获取当前dgv选择中的行图书编号
            string        bkid   = dgvBook.CurrentRow.Cells[0].Value.ToString();
            frmBookDetail objfrm = new frmBookDetail();

            objfrm.bookid     = bkid;
            objfrm.actionflag = 2;
            DialogResult dr = objfrm.ShowDialog();

            if (dr == DialogResult.OK)
            {
                List <BookExtModel> data = bkbll.GetAllBooks();
                BindBook(data);
            }
        }