我可以获取textbox_name text和listbox_order项目在另一行列表框上正确显示

Question

我有3个列表框，ListBox_Menu是单击按钮（主菜，饮料和侧面）首先显示项目的地方，然后添加项目以订购您从listbox_menu中选择您的项目，然后单击添加订单以订购它出现在listbox_order中。一旦准备好的客户订单就从那里开始，提交按钮将打印出客户名称（TextBox_name）和ListBox_order中的所有项目，并将其全部显示为一行。

我只是难以弄清楚如何做到这一点，如果有人可以提供帮助。

Answer 1

首先定义两个全局变量，然后使用calculateTotAlcost函数（我定义了）。

我的答案已更新。

输出（在Visual Studio 2017，.NET框架4.5.2中测试）：

这些是我的代码：

    public Form1()
    {
        InitializeComponent();
        listBox_menu.SelectionMode = SelectionMode.MultiExtended;
    }
    double Cost = 0;
    string Order = null;
    public double CalculateTotalCost(object input, bool Total)
    {
        if (Total == true)
        {
            switch (input)
            {
                case "Salad":
                    Cost += 2500;
                    break;
                case "Rice":
                    Cost += 3000;
                    break;
                case "non-alcoholic beer":
                    Cost += 1000;
                    break;
                case "Water":
                    Cost += 200;
                    break;
                case "Ex1":
                    Cost += 2200;
                    break;
                default:
                    Cost += 2200;
                    break;
            }
        }
        else
        {
            switch (input)
            {
                case "Salad":
                    Cost -= 2500;
                    break;
                case "Rice":
                    Cost -= 3000;
                    break;
                case "non-alcoholic beer":
                    Cost -= 1000;
                    break;
                case "Water":
                    Cost -= 200;
                    break;
                case "Ex1":
                    Cost -= 2200;
                    break;
                default:
                    Cost -= 2200;
                    break;
            }
        }
        return Cost;
    }
    private void Entrees_Click(object sender, EventArgs e)
    {
        listBox_menu.Items.Clear();
        listBox_menu.Items.Add("Salad");
        listBox_menu.Items.Add("Rice");
    }
    private void Drinks_Click(object sender, EventArgs e)
    {
        listBox_menu.Items.Clear();
        listBox_menu.Items.Add("non-alcoholic beer");
        listBox_menu.Items.Add("Water");
    }
    private void Sides_Click(object sender, EventArgs e)
    {
        listBox_menu.Items.Clear();
        listBox_menu.Items.Add("Ex1");
        listBox_menu.Items.Add("Ex2");
    }
    private void AddtoOrder_Click(object sender, EventArgs e)
    {
        if(listBox_menu.SelectedItems.Count>0)
        {
            for (int i = 0; i < listBox_menu.SelectedItems.Count; i++)
            {
                listBox_order.Items.Add(listBox_menu.SelectedItems[i].ToString());
                lblTotalCost.Text = (CalculateTotalCost(listBox_menu.SelectedItems[i].ToString(),true)).ToString();
            }
        }
    }
    private void RemoveFromOrder_Click(object sender, EventArgs e)
    {
        if (listBox_order.SelectedItems.Count > 0)
        {
            listBox_order.Items.Remove(listBox_order.SelectedItem);
        }
        Order = null;
        for (int i = 0; i < listBox_order.Items.Count; i++)
        {
            Order += listBox_order.Items[i].ToString() + " , ";
        }
        Cost = 0;
        if (listBox_order.Items.Count > 0)
        {
            for (int i = 0; i < listBox_order.Items.Count; i++)
            {
                Cost = (CalculateTotalCost(listBox_order.Items[i], true));
            }
        }
        lblTotalCost.Text = Cost.ToString();
    }
    private void Submit_Click(object sender, EventArgs e)
    {
        MessageBox.Show("Customer name: " + txtBoxCustomerName.Text + " Orders: " + Order + " Total cost: " + Cost);
    }