我如何才能在实时C＃中以秒为单位停止计时器？

Question

I'm trying to stop a timer when 16 seconds in real time have passed, but i don't know how i can do that.

I made this little example: when picturebox1 intersects with picturebox2,this action activate a timer, and this timer have to shows the picturebox3 during 16 seconds in real time and after stop it(timer) (and the picturebox3 doesn't show).

(Sorry for my english. But StackOverflow in Spanish doesn't have many information).

I'm using windows form and C#

    private void timer2_Tick(object sender, EventArgs e)
    {
        pictureBox7.Hide();
        if ((pictureBox3.Bounds.IntersectsWith(pictureBox2.Bounds) && pictureBox2.Visible) || (pictureBox5.Bounds.IntersectsWith(pictureBox2.Bounds) && pictureBox2.Visible))
        {                
            puntaje++;
            this.Text = "Puntaje: " + puntaje;
            if (puntaje % 5 == 0)
            {
               timer3.Enabled=true;
 //This is the part where i want set down the timer3, timer 2 is on

            }
        }

Answer 1

You can try this, on your timer tick event handler. Timespan counts the elapsed time between two dates. On this case since its 16 seconds, we count it by negative.

private void timer1_Tick(object sender, EventArgs e)
    {
        TimeSpan ts = dtStart.Subtract(DateTime.Now);
        if (ts.TotalSeconds <= -16)
        {
            timer1.Stop();
        }
    }

Make sure your dtStart (DateTime) is declared when you start your timer:

timer1.Start();
dtStart = DateTime.Now;

Answer 2

The cleanest way I can see this implemented is by using the interval parameter of a System.Timers.Timer .

Here's a sample snippet of the code

var timer = new Timer(TimeSpan.FromSeconds(16).TotalMilliseconds) { AutoReset = false };
timer.Elapsed += (sender, e) =>
{
    Console.WriteLine($"Finished at exactly {timer.Interval} milliseconds");
};
_timer.Start();

The TimeSpan.FromSeconds(16).TotalMilliseconds basically converts to 16000 but I used the TimeSpan static method for you to understand it easier and looks more readable.

The AutoReset property of the timer tells it that it should only be triggered once.

Adjusted for your code

private void timer2_Tick(object sender, EventArgs e)
{
    pictureBox7.Hide();
    if ((pictureBox3.Bounds.IntersectsWith(pictureBox2.Bounds) && pictureBox2.Visible) 
        || (pictureBox5.Bounds.IntersectsWith(pictureBox2.Bounds) && pictureBox2.Visible))
    {                
        puntaje++;
        this.Text = "Puntaje: " + puntaje;
        if (puntaje % 5 == 0)
        {
            var timer3 = new Timer(TimeSpan.FromSeconds(16).TotalMilliseconds) { AutoReset = false };
            timer3.Elapsed += (sender, e) =>
            {
                pictureBox3.Visible = true;
            };
            timer3.Start();
        }
    }
}

Please do mark the question Answered if this solves your issue.