Demonstrates using the System.Threading.Timer object : Timer : Development Class C# Source Code

    


/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
 
// ThrdTime.cs -- Demonstrates using the System.Threading.Timer object.
//
//                Compile this program with the following command line:
//                    C:>csc ThrdTime.cs
using System;
using System.Windows.Forms;
using System.Threading;

namespace nsDelegates
{
    public class ThrdTime
    {
        static int countdown = 10;
        static System.Threading.Timer timer;
        static public void Main ()
        {
// Create the timer callback delegate.
            System.Threading.TimerCallback cb = new System.Threading.TimerCallback (ProcessTimerEvent);
// Create the object for the timer.
            clsTime time = new clsTime ();
// Create the timer. It is autostart, so creating the timer will start it.
            timer = new System.Threading.Timer (cb, time, 4000, 1000);
// Blessed are those who wait.
            MessageBox.Show ("Waiting for countdown", "Text");
        }
// Callback method for the timer. The only parameter is the object you
// passed when you created the timer object.
        private static void ProcessTimerEvent (object obj)
        {
            --countdown;
// If countdown is complete, exit the program.
            if (countdown == 0)
            {
                timer.Dispose ();
                Environment.Exit (0);
            }
            string str = "";
// Cast the obj argument to clsTime.
            if (obj is clsTime)
            {
                clsTime time = (clsTime) obj;
                str = time.GetTimeString ();
            }
            str += "\r\nCountdown = " + countdown;
            MessageBox.Show (str, "Timer Thread");
        }
    }
// Define a class to use as the object argument for the timer.
    class clsTime
    {
        public string GetTimeString ()
        {
            string str = DateTime.Now.ToString ();
            int index = str.IndexOf(" ");
            return (str.Substring (index + 1));
        }
    }
}