Question

I am attempting to invoke a method as many times as possible given its within 1 second, so I decided to use a timer to help perform this, but when the timer runs the tick event handler (after 1 seconds) the method is still invoked – I have started it of as follows:

public partial class Form1 : Form
    {
        public static Timer prntScreenTimer = new Timer();

        public Form1()
        {
            InitializeComponent();

            startCapture();
        }

        private static void startCapture()
        {
            prntScreenTimer.Tick += new EventHandler(prntScreenTimer_Tick);
            prntScreenTimer.Start();
            prntScreenTimer.Interval = 1000;
            while (prntScreenTimer.Enabled)
            {
                captureScreen();
            }

        }

        private static void prntScreenTimer_Tick(object sender, EventArgs e)
        {
            prntScreenTimer.Stop();
        }

        private static void captureScreen()
        {
            int ScreenWidth = Screen.PrimaryScreen.Bounds.Width;
            int ScreenHeight = Screen.PrimaryScreen.Bounds.Height;
            Graphics g;
            Bitmap b = new Bitmap(ScreenWidth, ScreenHeight);
            g = Graphics.FromImage(b);
            g.CopyFromScreen(Point.Empty, Point.Empty, Screen.PrimaryScreen.Bounds.Size);

            // Draw bitmap to screen
            // pictureBox1.Image = b;

            // Output bitmap to file
            Random random = new Random();
            int randomNumber = random.Next(0, 10000);
            b.Save("printScrn-" + randomNumber, System.Drawing.Imaging.ImageFormat.Bmp);
        }

    }
}

Answer 1

Your code looks correct to me, so I can’t identify the cause of your issue. However, you don’t really need a Timer for what you’re doing; a simple Stopwatch checked within a while loop may suffice:

Stopwatch sw = Stopwatch.StartNew();
while (sw.ElapsedMilliseconds < 1000)
    captureScreen();