/*
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));
}
}
}
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