private void button_add_Click(object sender, EventArgs e)
{
string name = ((Button)sender).Name.Split('_')[1];
string propertyName = name.Substring(0, 1).ToUpper() + name.Substring(1);
Goods selectedGoods = goodService.QueryGoods(name);
int count = (int)this.GetType().GetProperty(propertyName).GetValue(this);
itemList.Add(new OrderDetails(count, selectedGoods));
MessageBox.Show("已加入购物车");
}