c#中，运算符使用时，可以将运算符的方法进行重载
重载加号运算

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    class Box
{
    private double length;
    private double width;
    private double height;

    public override string ToString()
    {
        return this.length+","+ this.width+","+this.height;
    }

    public double getVolume()
    {
        return length * width * height;
    }
    public void setLength(double length)
    {
        this.length = length;
    }

    public void setBreadth(double width)
    {
        this.width = width;
    }

    public void  (double height)
    {
        this.height = height;
    }

    //重载加号运算符
    public static Box operator +(Box b, Box c)
    {
        Box box = new Box();
        box.length = 10;
        box.width = 10;
        box.height = 10;
        return box;
    }
}

在类里面重写运算符的方法，当外面有两个实例对象进行运算符运输时，就会触发该方法
能被重载的运算符