无法停止计时器

Question

我创建了Forms.Timer的子类，我无法停止此计时器。

public class Clock : Timer
{
    private int startTime;
    private PictureBox one;
    private PictureBox two;
    private PictureBox three;

    public Clock(Size _size) : base() 
         { startTime = 0; initialComponent(_size); }
    public Clock(int start_time, Size _size) : base() 
         { startTime = start_time; initialComponent(_size); }

    public Point Location
    {
        get { return three.Location; }

        set 
        {
            three.Location = value;
            two.Location = new Point(value.X + three.Width, value.Y);
            one.Location = new Point(value.X + three.Width + two.Width, value.Y);
        }
    }

    private void initialComponent(Size _size)
    {
        ......
    }


    public void Show()
    {
        int bits = startTime % 10;
        int ten = (startTime % 100) / 10;
        int hundred = (startTime % 1000) / 100;

        one.Image = ImageLauncher.loadImage(bits, ImageLauncher.ImageType.Timer);
        two.Image = ImageLauncher.loadImage(ten, ImageLauncher.ImageType.Timer);
        three.Image = ImageLauncher.loadImage(hundred, ImageLauncher.ImageType.Timer);
    }

    protected override void OnTick(EventArgs e)
    {
        startTime++;
        if (startTime > 999 || startTime < 0) return;

        this.Show();
    }
}

我在窗体的构造函数中创建一个对象，计时器可以正常启动，但Stop（）方法不起作用。我试图创建一个方法来将Timer.Enabled设置为false，但它仍在继续，更奇怪的是我试图用timer.Enabled以同样的方法重置间隔，间隔已经改变但是计时器仍然没有消失。

在构造函数中：

        clock = new Clock(new Size(23 * 3, 38));

启动：

        if (!clock.Enabled) clock.Start();

带停止的方法：

private void gameOver(bool is_win)
{
    clock.Stop();
    showAll();
    string winface = is_win ? "cool" : "sad";
    ShortCutStart.Image = ImageLauncher.loadImage(winface, ImageLauncher.ImageType.Face);
    ShortCutStart.Name = winface;
}