private void ChangeOrder_Click(object sender, EventArgs e) { if (OrderId.Text == "" || CustomerId.Text == "" || CustomerName.Text == "" || GoodsId.Text == "" || GoodsName.Text == "" || GoodsPrice.Text == "" || Quantity.Text == "") { MessageBox.Show("请输入完整信息!"); return; } order.Details.ElementAt(j).Goods.Id = int.Parse(GoodsId.Text); order.Details.ElementAt(j).Goods.Name = GoodsName.Text; order.Details.ElementAt(j).Goods.Price = int.Parse(GoodsPrice.Text); order.Details.ElementAt(j).Quantity = int.Parse(Quantity.Text); orderService.Update(order); MessageBox.Show("修改成功!"); }