Timer, javatimer

Timer, javatimer
There are three timer classes

1. System. Windows. Forms. Timer

Usage: Windows Forms Application, and must be used in the window.

2. System. Timers. Timer

Usage: In the application

One is the execution method:

1. System. Threading. Timer

Usage:The execution method mechanism cannot inherit this class.

 

System. Windows. Forms. timer usage

 

1. System. Windows. Forms. Timer myTimer = new System. Windows. Forms. Timer (); // instantiate a timer

2. myTimer. Tick + = new EventHandler (function name); // suspend the timer event

3. myTimer. Enabled = true; // make timer available

4. myTimer. Interval = n; // set the Interval, in milliseconds

5. myTimer. Stop (); // use the Stop () method to pause timing.

6. myTimer. Enabled = false; // disable timer.

 

 

Usage of System. Timers. Timer:

1 System. timers. timer t = new System. timers. timer (10000); // instantiate the Timer class, set the interval to 10000 milliseconds; 2 t. elapsed + = new System. timers. elapsedEventHandler (theout); // execute the event when the arrival time is reached; 3 t. autoReset = true; // set whether to execute once (false) or always execute (true); 4 t. enabled = true; // whether to execute System. timers. timer. elapsed event; 5 6 public void theout (object source, System. timers. elapsedEventArgs e) 7 {8 MessageBox. show ("OK! "); 9}

 

 

Usage of System. Threading. Timer:

Demo application:

Application Scenario: After the windows form program automatically executes a job, it is expected that its windows form will be automatically disabled.

Code Design: (1) Declare the Timer variable first:

Private System. Threading. Timer timerClose;

 

(2) Add the following Timer instantiation code after the above Automatic Execution Code:

// Create a timer thread and start it

TimerClose = new System. Threading. Timer (new TimerCallback (timerCall), this, 5000, 0 );

 

Description of Timer constructor parameters:

Callback: A TimerCallback delegate that indicates the method to be executed.

State: an object that contains the information to be used by the callback method, or a null reference (Nothing in Visual Basic ).

DueTime: The amount of time delay before calling callback (in milliseconds ). Specify Timeout. Infinite to prevent the timer from starting timing. Specify zero (0) to start the timer immediately.

Period: The interval (in milliseconds) between calls to callback ). The specified Timeout. Infinite can disable periodic termination.

 

(3) define the method to be executed by the TimerCallback delegate:

Private void timerCall (object obj)

{

TimerClose. Dispose ();

This. Close ();

}

 1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 using System.Threading;10 11 namespace MYTimerTest12 {13  public partial class Form1 : Form14  {15  public Form1()16  {17  InitializeComponent();18  }19 20 private void Form1_Load(object sender, EventArgs e)21  {22 23 System.Threading.Timer timer = new System.Threading.Timer(new TimerCallback(timer_Elapsed), null, 0, 1000);24  }25 26 void timer_Elapsed(object sender)27  {28  for (int i = 0; i < 10; i++)29  {30  Console.Out.WriteLine(DateTime.Now + " " + DateTime.Now.Millisecond.ToString() + "timer in:");31  }32 33  }34  }35 }