C# 继承 - 类的层次结构>

嘿伙计们，

我在理解 C# 中的继承过程时遇到问题。我正在做作业，我想分享我想出的代码。我也包括任务。

任务：

    Work 1:
    Develop a hierarchic structure of classes: shape, circle and cylinder:
    Write the base class Shape which has two fields x and y coordinates The function
    Display() returns a text string, which contains the point position.
    The derived classes Circle and Cylinder inherit x , y coordinates and the method
    Display() from base class Shape. You define the new necessary fields and methods
    and you override the method Display() to return a text string with the coordinates,
    the area and/or the volume.
    The computing formulas are:
     Circle area : p * r 2
     Cylinder area: (2*p * r 2 ) + (2*p * r * h)
     Cylinder volume: p * r 2 * h

这是我的代码：

类形状：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
    class Shape
    {
    public int xCoordinate = 0;
    public int yCoordinate = 2;
    public virtual void Display()
    {
        Console.WriteLine("The position of the point is: [{0};{1}].", xCoordinate, yCoordinate);
    }
}
}

班级圈：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Circle : Shape
{
    public override void Display()
    {
        double PI = Math.PI;
        double radius = 2;
        double circleArea = (PI * radius * radius);
        Console.WriteLine("The area of the circle is: {0:F2}", circleArea);
    }
}
}

气缸类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Cylinder : Shape
{
    public override void Display()
    {
        double PI = Math.PI;
        double radius = 2;
        double height = 5.5;
        double cylinderArea = (2* PI * radius * radius) + (2 * PI * radius * height);
        Console.WriteLine("The area of the cylinder is: {0:F2}", cylinderArea);
        double cylinderVolume = (PI * radius * radius * height);
        Console.WriteLine("The volume of the cylinder is: {0:F3}'n", cylinderVolume);
    }
}
}

和主类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("A: Work 1'n");
        Shape position = new Shape();
        position.Display();
        Circle circleArea = new Circle();
        circleArea.Display();
        Cylinder cylinderArea = new Cylinder();
        cylinderArea.Display();
    }
}
}

我

想知道我哪里做错了。继承的概念对我来说有点难以理解。如何改进此练习以完成任务？

谢谢你的回答！ 五.

编辑：

我已经编辑了代码，所以现在应该有适当的内在。最后一个问题。我应该把代码 Console.WriteLine 放在哪里来获取输出？

类形状：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Shape
{
    public int xCoordinate = 0;
    public int yCoordinate = 2;
    public string Display()
    {
        string xCoordinateString = xCoordinate.ToString();
        string yCoordinateString = yCoordinate.ToString();
        return xCoordinateString + yCoordinateString;
    }
}
}

班级圈：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Circle : Shape
{
    public new string Display()
    {
        double PI = Math.PI;
        double radius = 2;
        double circleArea = (PI * radius * radius);
        string circleAreaString = circleArea.ToString();
        return circleAreaString;
    }
}
}

类气缸：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace A_Work_1
{
class Cylinder : Circle
{
    public string Display(double radius, double PI)
     {
        double height = 5.5;
        double cylinderArea = (2* PI * radius * radius) + (2 * PI * radius * height);
        string cylinderAreaString = cylinderArea.ToString();
        double cylinderVolume = (PI * radius * radius * height);
        string cylinderVolumeString = cylinderVolume.ToString();
        return cylinderVolumeString + cylinderAreaString;
    }
}
}

主类保持不变。谢谢，V。

最后编辑：

我已经更改了主类代码，所以现在有这样的 Console.WriteLine 代码：

Shape position = new Shape();
Console.WriteLine(position.Display());

我

遇到的最后一个问题是，当我运行应用程序时，我得到的圆面积和圆柱面积的数字相同。看起来类 Cylinder 中的 Display 方法正在使用类 Circle 的返回值。这怎么可能？

class Circle : Shape
{
   public double radius = 2;
   ...
class Cylinder : Circle
{
   public double height = 5.5;
   ...

public virtual string Display()
{
   return "[" + this.xCoordinate + ", " + this.yCoordinate + "]";
}

public override string Display()
{
   return base.Display() + Environment.NewLine + 
       "Area = " + (Math.PI * this.radius * this.radius).ToString();
}

public override string Display()
{
   return base.Display() + Environment.NewLine + 
       "Volume = " + (Math.PI * this.radius * this.radius * this.height).ToString();
}

Circle myCircle = new Circle();
Console.WriteLine(myCircle.Display());
Cylinder myCylinder = new Cylinder();
Console.WriteLine(myCylinder.Display());

public class Rectangle : Shape{
   public virtual int Width{get;set}
   public virtual int Height{get;set}
}
public class Square : Rectangle{
   public override int Width{get{return Height;} set{Height = value;}}
}

rect.Height = 10;
rect.Width = 5;

abstract class Shape{
   public abstract double Area{get;} 
}
class Cylinder : Shape{
private Circle baseCircle;
private double height;
public override double Area{
get{//use height and baseCircle for the calculation left. 
    //Actual code left out because it's homework}
}