private void 注销_5_Click(object sender, EventArgs e) { int ID; ID = Convert.ToInt32(tb5_6.Text.Trim()); new_user = UserAdmin.GetUser(ID); if (new_user == null) { MessageBox.Show("无此用户!"); return; } if (tb5_7.Text != new_user.Pwd) { MessageBox.Show("密码不正确!"); return; } dt = BorrowAdmin.GetBorrow(ID); int num = 0; for (int i = 0; i < dt.Rows.Count; i++) { //if (Convert.ToInt32(dt.Rows[i][7]) == 0) if (dt.Rows[i][7].ToString() == "False") { num++; } } if (num != 0) { MessageBox.Show("该用户有未归还的书!"); return; } new_borrow.UID = new_user.ID; borrowBLL.Delete(new_borrow); userBLL.Delete(new_user); MessageBox.Show("状态:注销成功!"); tb5_6.Text = ""; tb5_7.Text = ""; if (ID == user.ID) { Login form = new Login(); form.main = this; form.Show(); this.Hide(); user = null; } }