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();
 }
 }
 }