因此，我制作了这种形式的蛋糕店。除了价格，我一切都正常。由于某种原因，它无法正确显示，并每次显示“ $ 22.60”。我在想方法可能有问题
public virtual double CalculateCakeCost()
{
return CAKE_PRICE + (LAYER_PRICE * NumOfLayers);
}
因为它似乎返回了蛋糕价格，但未将其与方括号值相加，因此来自“蛋糕”类。来自“ CustomCake”类的使用税法计算成本似乎也可以正常工作。您可以阅读下面的其余代码，请告诉我是否有问题，因为我看不到任何错误。
namespace Lab_OrderCake_The_Bakery_
{
public partial class frmOrderCake : Form
{
Cake objcake;
CustomCake objcustcake;
Customer objcustomer;
Order objorder;
public frmOrderCake()
{
InitializeComponent();
}
private void btnOrder_Click(object sender, EventArgs e)
{
//flavour
if (radVanilla.Checked == true)
{
txtRadFlavour.Text = "Vanilla";
}
if (radChocolate.Checked == true)
{
txtRadFlavour.Text = "Chocolate";
}
if (radBanana.Checked == true)
{
txtRadFlavour.Text = "Banana";
}
if (radLemonBerry.Checked == true)
{
txtRadFlavour.Text = "Lemon banana";
}
//layers
if (rad1layer.Checked == true)
{
numRadLayers.Value = 1;
}
if (rad2layers.Checked == true)
{
numRadLayers.Value = 2;
}
if (rad3layers.Checked == true)
{
numRadLayers.Value = 3;
}
if (rad4layers.Checked == true)
{
numRadLayers.Value = 4;
}
//occassion
if (radAnniversary.Checked == true)
{
txtRadOcc.Text = "Anniversary";
}
if (radBirthday.Checked == true)
{
txtRadOcc.Text = "Birthday";
}
if (radRetirement.Checked == true)
{
txtRadOcc.Text = "Retirement";
}
if (radWedding.Checked == true)
{
txtRadOcc.Text = "Wedding";
}
//size
if (rad6inch.Checked == true)
{
numRadSize.Value = 6;
}
if (rad8inch.Checked == true)
{
numRadSize.Value = 8;
}
if (rad10inch.Checked == true)
{
numRadSize.Value = 10;
}
if (rad12inch.Checked == true)
{
numRadSize.Value = 12;
}
//design
if (radPolka.Checked == true)
{
txtRadDesign.Text = "Polka Dots";
}
if (rad8inch.Checked == true)
{
txtRadDesign.Text = "Edible Images";
}
if (rad10inch.Checked == true)
{
txtRadDesign.Text = "Fondant Bow";
}
if (rad12inch.Checked == true)
{
txtRadDesign.Text = "3D Figures";
}
objcake = new Cake(txtRadFlavour.Text, (int)numRadLayers.Value);
objcustomer = new Customer(txtFName.Text, txtLName.Text);
objcustcake = new CustomCake(txtRadFlavour.Text, (int)numRadLayers.Value, txtRadOcc.Text,
(int)numRadSize.Value, txtRadDesign.Text);
objorder = new Order();
lblOutOrder.Text = objcustomer.ToString() + objcustcake.ToString() + objorder.ToString();
}
}
namespace CakeClasses
{
public class Cake
{
public int NumOfLayers { get; set; }
public string Flavour { get; set; }
public double Price { get; set; }
public const double CAKE_PRICE = 20;
public const int LAYER_PRICE = 3;
public Cake()
{
Flavour = "";
NumOfLayers = 0;
}
public Cake(string flavour, int numLayers)
{
NumOfLayers = numLayers;
Flavour = flavour;
}
**public virtual double CalculateCakeCost()
{
return CAKE_PRICE + (LAYER_PRICE * NumOfLayers);
}**
public override string ToString()
{
return " " + Flavour + " flavoured cake with " + NumOfLayers + " layer(s)";
}
}
}
namespace CakeClasses
{
public class Order
{
public Customer Customer { get; set; }
public Cake Cake { get; set; }
public int NumOfCakes { get; set; }
public Order()
{
Customer = new Customer();
Cake = new Cake();
NumOfCakes = 1;
}
public Order(string fName, string lName, string flavour, int numLayers, string occasion, int
diameter, string design)
{
Customer = new Customer(fName, lName);
Cake = new CustomCake(flavour, numLayers, occasion,diameter,design);
NumOfCakes = 1;
}
public Order(string fName, string lName, string flavour, int numLayers)
{
Customer = new Customer(fName, lName);
Cake = new Cake(flavour, numLayers);
NumOfCakes = 1;
}
public double CalculateCostWithTax()
{
return Cake.CalculateCakeCost() * 1.13;
}
public override string ToString()
{
return "for the total cost of " + CalculateCostWithTax().ToString("C");
}
}
}
namespace CakeClasses
{
public class CustomCake : Cake
{
public string Occasion { get; set; }
public int Size { get; set; }
public string Design { get; set; }
private double DesignCost { get; set; }
public CustomCake(string flavour, int numLayers,string occasion, int diameter, string design)
:base(flavour,numLayers)
{
Occasion = occasion;
Size = diameter;
Design = design;
switch (Design)
{
case "Polka Dots":
DesignCost = 5;
break;
case "Edible Images":
DesignCost = 12;
break;
case "Fondant Bow":
DesignCost = 10;
break;
default:
DesignCost = 15;
break;
}
}
public override double CalculateCakeCost()
{
return base.CalculateCakeCost() + Size + DesignCost;
}
public override string ToString()
{
return base.ToString() + " with " + Design + " design for " + Occasion + " occassion and
size is " + Size + " inches " ;
}
}
}
c#大神给出的解决方案
尝试替换代码中的以下行：
objorder = new Order();
与：
objorder = new Order("First Name","Last Name",txtRadFlavour.Text, (int)numRadLayers.Value);
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