private void btnQuery_Click(object sender, EventArgs e)
{
switch (cbxField.SelectedIndex)
{
case 0: //所有订单
orderbindingSource.DataSource = orderService.Orders;
break;
case 1: //根据ID查询
int.TryParse(Keyword, out int id);
Order order = orderService.GetOrder(id);
List <Order> result = new List <Order>();
if (order != null)
{
result.Add(order);
}
orderbindingSource.DataSource = result;
break;
case 2: //根据客户查询
orderbindingSource.DataSource = orderService.QueryOrdersByCustomerName(Keyword);
break;
case 3: //根据货物查询
orderbindingSource.DataSource = orderService.QueryOrdersByGoodsName(Keyword);
break;
case 4: //根据总价格查询（大于某个总价）
float.TryParse(Keyword, out float totalPrice);
orderbindingSource.DataSource =
orderService.QueryByTotalAmount(totalPrice);
break;
}
orderbindingSource.ResetBindings(false);
}