private void btnSelectSubmit_Click(object sender, EventArgs e) { try { int index = cmbSelect.SelectedIndex; string str = txtSelect.Text; List <Order> result = orderService.SelectOrder(index, str); bindingSourceOrder.DataSource = result; dataGridOrder.Visible = true; } catch (FormatException fe) { MessageBox.Show("输入数据异常,请检查"); } }