为什么我会得到我的圈子值零？ [英] Why am I getting a value of zero for my circle?

问题描述

下面是我的Circle类代码

Here is my Circle class code.

class Circle
{
    private double radius;
    private double area;

    public Circle(double radius)
    {
        this.radius = radius;
    }

    public double Area
    {
        set { area = Math.PI * Math.Pow(radius, 2); }
        get { return area; }

    }
}

这是测试代码。

    Circle circle1 = new Circle(3);

    MessageBox.Show("Circle 1 Area: " + circle1.Area);

所以，出于某种原因，当我用MessageBox.Show（），似乎给我值零代替。我给圈3的值，因此应该不是我的构造函数中设置半径是什么？

So for some reason, when I use the MessageBox.Show(), it seems to give me values of zero instead. I gave the circle a value of 3 so shouldn't my constructor set the value of the radius that?

推荐答案

由于你的避风港的价值T曾经呼吁区二传手。也许你想这样的事情，而不是

Because you haven't ever called the setter on Area. Perhaps you want something like this instead?

class Circle
{
    private double radius;

    public Circle(double radius)
    {
        this.radius = radius;
    }

    public double Area
    {
        get { return Math.PI * Math.Pow(radius, 2); }    
    }
}

这将每次计算方面，有要求

This will compute the Area every time it is requested.

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