三种timer控件的简单实例

 1 .system.windows.forms

 .system.threading.timer

 .system.timers.timer

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Linq;

 using System.Text;

 using System.Threading;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace winformTimer

 {

 public partial class Form1 : Form

 {

 //不精确

 public System.Windows.Forms.Timer timerEve;

 public Form1()

 {

 InitializeComponent();

 CheckForIllegalCrossThreadCalls = false;

 }

 private void button1_Click(object sender, EventArgs e)

 {

 timerEve = new System.Windows.Forms.Timer();

 timerEve.Interval = ;

 timerEve.Tick += timerEve_Tick;

 timerEve.Start();

 }

 void timerEve_Tick(object sender, EventArgs e)

 {

 label1.Text = DateTime.Now.ToString();

 }

 public System.Timers.Timer timeEveTwo;

 private void button2_Click(object sender, EventArgs e)

 {

 //Thread thread = new Thread(new ParameterizedThreadStart(theout));

 //thread.Start();

 timeEveTwo = new System.Timers.Timer();

 //到达时间，执行事件

 timeEveTwo.Elapsed += new System.Timers.ElapsedEventHandler(theout);

 //执行一次为false 一直执行为true

 timeEveTwo.AutoReset = true;

 timeEveTwo.Start();

 }

 public void theout(object source,System.Timers.ElapsedEventArgs e)

 {

 //if(label2.InvokeRequired)

 //{

 // Action<string> changetime = (s) => { label2.Text = s.ToString(); };

 // label2.Invoke(changetime);

 //}

 //else

 //{

 label2.Text = DateTime.Now.ToString();

 //}

 }

 //Callback：一个 TimerCallback 委托，表示要执行的方法。

 //State：一个包含回调方法要使用的信息的对象，或者为空引用（Visual Basic 中为 Nothing）。

 //dueTime：调用 callback 之前延迟的时间量（以毫秒为单位）。指定 Timeout.Infinite 以防止计时器开始计时。指定零 (0) 以立即启动计时器。

 //Period：调用 callback 的时间间隔（以毫秒为单位）。指定 Timeout.Infinite 可以禁用定期终止。

 public System.Threading.Timer threadtimer;

 private void button3_Click(object sender, EventArgs e)

 {

 threadtimer = new System.Threading.Timer(new TimerCallback(timecall),null,,);

 }

 private void timecall(object obj)

 {

 label3.Text = DateTime.Now.ToString();

 }

 }

 }