Csharp/C Sharp/Development Class/Timer

Control Modifier

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;

namespace ControlModifier
{
    /// <summary>
    /// Summary description for ControlModifier.
    /// </summary>
    public class ControlModifier : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public ControlModifier()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            System.Timers.Timer t = new System.Timers.Timer(10000);
            t.Elapsed += new System.Timers.ElapsedEventHandler(time);
            t.Start();
        }
        void time(object sender, System.Timers.ElapsedEventArgs e)
        {
            MessageBox.Show(ControlModifier.ModifierKeys.ToString());
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.ruponents = new System.ruponentModel.Container();
            this.Size = new System.Drawing.Size(300,300);
            this.Text = "ControlModifier";
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new ControlModifier());
        }
    }
}

Demonstrates using the System.Threading.Timer object

/*
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));
        }
    }
}

Demonstrates using the System.Timers.Timer class 2

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
 
// Timer.cs -- demonstrates using the System.Timers.Timer class.
//
//             Compile this program with the following command line:
//                 C:>csc Timer.cs
using System;
using System.Windows.Forms;
using System.Timers;
namespace nsDelegates
{
    public class TimerAndDialog
    {
        static int countdown = 10;
        static System.Timers.Timer timer;
        static public void Main ()
        {
// Create the timer object.
            timer = new System.Timers.Timer (1000);
// Make it repeat. Setting this to false will cause just one event.
            timer.AutoReset = true;
// Assign the delegate method.
            timer.Elapsed += new ElapsedEventHandler(ProcessTimerEvent);
// Start the timer.
            timer.Start ();
// Just wait.
            MessageBox.Show ("Waiting for countdown", "Text");
        }
// Method assigned to the timer delegate.
        private static void ProcessTimerEvent (Object obj, ElapsedEventArgs e)
        {
            --countdown;
// If countdown has reached 0, it"s time to exit.
            if (countdown == 0)
            {
                timer.Close();
                Environment.Exit (0);
            }
// Make a string for a new message box.
            string sigtime = e.SignalTime.ToString ();
            string str = "Signal time is " + sigtime.Substring (sigtime.IndexOf(" ") + 1);
            str += "\r\nCountdown = " + countdown;
// Show a message box.
            MessageBox.Show (str, "Timer Thread");
        }
    }
}

Digital Clock with Date

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class DigitalClock: Form
{
     public static void Main()
     {
          Application.Run(new DigitalClock());
     }
     public DigitalClock()
     {
          ResizeRedraw = true;
          Timer timer    = new Timer();
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Interval = 1000;
          timer.Start();
     }
     private void TimerOnTick(object obj, EventArgs ea)
     {
          Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx    = pea.Graphics;
          DateTime dt      = DateTime.Now;
          string   strTime = dt.ToString("d") + "\n" + dt.ToString("T");
          SizeF    sizef   = grfx.MeasureString(strTime, Font);
          float    fScale  = Math.Min(ClientSize.Width  / sizef.Width,
                                      ClientSize.Height / sizef.Height);
          Font     font    = new Font(Font.FontFamily,
                                      fScale * Font.SizeInPoints);
   
          StringFormat strfmt = new StringFormat();
          strfmt.Alignment = strfmt.LineAlignment = StringAlignment.Center;
   
          grfx.DrawString(strTime, font, new SolidBrush(ForeColor), 
                          ClientRectangle, strfmt);
     }
}

illustrates the use of the Timer class

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
  Example14_5.cs illustrates the use of the Timer class
*/
using System;
using System.Threading;
public class Example14_5 
{
  // the CheckTime method is called by the Timer
  public static void CheckTime(Object state) 
  {
    Console.WriteLine(DateTime.Now);
  }
  public static void Main() 
  {
    // create the delegate that the Timer will call
    TimerCallback tc = new TimerCallback(CheckTime);
    // create a Timer that runs twice a second, starting in one second
    Timer t = new Timer(tc, null, 1000, 500);
    // Wait for user input
    Console.WriteLine("Press Enter to exit");
    int i = Console.Read();
    // clean up the resources
    t.Dispose();
    t = null;
  }
}

Interval, Tick, Stop

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class CloseInFive: Form
{
     public static void Main()
     {
          Application.Run(new CloseInFive());
     }
     public CloseInFive()
     {
          Text = "Closing in Five Minutes";
   
          Timer timer    = new Timer();
          timer.Interval = 5 * 60 * 1000;
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Enabled  = true;
     }
     void TimerOnTick(object obj, EventArgs ea)
     {
          Timer timer = (Timer) obj;
   
          timer.Stop();
          timer.Tick -= new EventHandler(TimerOnTick);
   
          Close();          
     }
}

Simple Clock

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class SimpleClock: Form
{
     public static void Main()
     {
          Application.Run(new SimpleClock());
     }
     public SimpleClock()
     {
          Timer timer    = new Timer();
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Interval = 1000;
          timer.Start();
     }
     private void TimerOnTick(object sender, EventArgs ea)
     {
          Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          StringFormat strfmt  = new StringFormat();
          strfmt.Alignment     = StringAlignment.Center;
          strfmt.LineAlignment = StringAlignment.Center;
   
          pea.Graphics.DrawString(DateTime.Now.ToString("F"),
                                  Font, new SolidBrush(ForeColor), 
                                  ClientRectangle, strfmt);
     }
}

Timer.Elapsed

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Timers;
class Program {
    static int counter = 0;
    static string displayString = "This string will appear one letter at a time. ";
    static void Main(string[] args) {
        Timer myTimer = new Timer(100);
        myTimer.Elapsed += new ElapsedEventHandler(WriteChar);
        myTimer.Start();
        Console.ReadKey();
    }
    static void WriteChar(object source, ElapsedEventArgs e) {
        Console.Write(displayString[counter++ % displayString.Length]);
    }
}

Using TimerCallback

 
using System;
using System.Threading;
class TimePrinter {
    static void PrintTime(object state) {
        Console.WriteLine("Time is: {0}, Param is: {1}", DateTime.Now.ToLongTimeString(), state.ToString());
    }
    static void Main(string[] args) {
        TimerCallback timeCB = new TimerCallback(PrintTime);
        Timer t = new Timer(
            timeCB,   // The TimerCallback delegate type.
            "Hi",     // Any info to pass into the called method.
            0,        // Amount of time to wait before starting.
            1000);    // Interval of time between calls. 
    }
}