Question

我有这个程序，我正在上课，我认为问题出在我的if语句中。当我运行程序并进行选择并点击总按钮时，我会在订单标签中显示“为您的开胃菜，主菜和甜点”以及订单总标签中的牛排晚餐价格。我想我可能不得不使用switch语句，但我不确定任何建议会有很大的帮助，谢谢。

 namespace Restaurant
 {
  public partial class frmRestaurant : Form
  {
    decimal AppetizerPrice = 0.0m;
    decimal EntreePrice = 0.0m;
    decimal DessertPrice = 0.0m;
    decimal total = 0.0m;
    string AppetizerOrder = "", EntreeOrder = "", DessertOrder = "", order = "";

    public frmRestaurant()
    {
        InitializeComponent();
    }

    private void exitToolStripMenuItem_Click(object sender, EventArgs e)
    {
        Application.Exit();
    }

    private void btnTotal_Click(object sender, EventArgs e)
    {
        CalculateTotal();
        Order();
        lblOrder.Text = order;
        lblTotal.Text = total.ToString();
    }

    private void grpAppetizer_Enter(object sender, EventArgs e)
    {
        if (radCheeseSticks.Checked)
        {
            AppetizerPrice = 5.99m;
            AppetizerOrder = "Cheese Sticks";
        }
        else if (radGarlicBread.Checked)
        {
            AppetizerPrice = 4.50m;
            AppetizerOrder = "Garlic Bread";
        }
        else if (radChipsnSalsa.Checked)
        {
            AppetizerPrice = 3.50m;
            AppetizerOrder = "Chips and Salsa";
        }
    }

    private void grpEntree_Enter(object sender, EventArgs e)
    {
        if (radSteakDinner.Checked)
        {
            EntreePrice = 12.50m;
            EntreeOrder = "Steak Dinner";
        }
        else if (radChickenParm.Checked)
        {
            EntreePrice = 10.99m;
            EntreeOrder = "Chicken Parmigiana";
        }
        else if (radChipsnSalsa.Checked)
        {
            EntreePrice = 3.50m;
            EntreeOrder = "Chips and Salsa";
        }
    }

    private void grpDessert_Enter(object sender, EventArgs e)
    {
        if (radSteakDinner.Checked)
        {
            DessertPrice = 12.50m;
            DessertOrder = "Steak Dinner";
        }
        else if (radChickenParm.Checked)
        {
            DessertPrice = 10.99m;
            DessertOrder = "Chicken Parmigiana";
        }
        else if (radChipsnSalsa.Checked)
        {
            DessertPrice = 3.50m;
            DessertOrder = "Chips and Salsa";
        }
    }

    public decimal CalculateTotal()
    {
        total = AppetizerPrice + EntreePrice + DessertPrice;
        return total;
    }

    public string Order()
    {
        order = AppetizerOrder + "for your appetizer," + EntreeOrder + "for your        entree, and " + DessertOrder + "for dessert";
        return order;
    }
 }
 }

Answer 1

我认为GroupBox.Enter事件对您的用例没有用处。在控件激活期间的某个时间调用enter事件，但在值更改时不调用。

解决问题的一种方法是仅在点击“总计”按钮时设置开胃菜/主菜/甜点价格和文字。您现在不需要在当前表单中使用它。

另一种解决方法是使用正确的事件：只需处理所有这些单选按钮的RadioButton.CheckedChanged事件，例如：

private void radGarlicBread_CheckedChanged(object sender, EventArgs e)
{
    if (radGarlicBread.Checked)
    {
        AppetizerPrice = 4.50m;
        AppetizerOrder = "Garlic Bread";
    }   
}

Answer 2

首先，您可能想要使用String.Format()，因为它看起来比一堆连接更清晰 - 它还可以帮助您捕捉诸如此处缺少空格之类的内容（您的输出看起来好像是，例如'Chips and Salsafor your appetizer ...'）

最好只找到Order方法中检查的项目，而不是每次用户检查时都更新它。

我不确定出了什么问题，但是每次调用每个Debug.WriteLine()方法时，你都可以做Enter()看看发生了什么。

例如：

Debug.WriteLine("grpDesert_Enter");
Debug.WriteLine(radSteakDinner.Checked);
Debug.WriteLine(radChickenPark.Checked);
Debug.WriteLine(radChipsnSalsa.Checked);

输出标签仅显示我想要显示的部分内容

2 个答案: