C#创建一个保持宽度和高度的矩形类。

public class Rectangle
{
    private int width;
    private int height;

    public int Width
    {
        get { return width; }
        set { width = value; }
    }

    public int Height
    {
        get { return height; }
        set { height = value; }
    }

    public Rectangle(int width, int height)
    {
        this.width = width;
        this.height = height;
    }

    public int CalculateArea()
    {
        return width * height;
    }
}