下面这段程序演示了Timer类的用法。
using System;
using System.Threading;
class TimerExampleState
{
public int counter = 0;
public Timer tmr;
}
class App
{
public static void Main()
{
TimerExampleState s = new TimerExampleState();
//创建代理对象TimerCallback,该代理将被定时调用
TimerCallback timerDelegate = new TimerCallback(CheckStatus);
//创建一个时间间隔为1s的定时器
Timer timer = new Timer(timerDelegate, s, 1000, 1000);
s.tmr = timer;
//主线程停下来等待Timer对象的终止
while (s.tmr != null)
Thread.Sleep(0);
Console.WriteLine("Timer example done.");
Console.ReadLine();
}
//下面是被定时调用的方法
static void CheckStatus(Object state)
{
TimerExampleState s = (TimerExampleState)state;
s.counter++;
Console.WriteLine("{0} Checking Status {1}.", DateTime.Now.TimeOfDay, s.counter);
if (s.counter == 5)
{
//使用Change方法改变了时间间隔
(s.tmr).Change(5000, 2000);
Console.WriteLine("changed");
}
if(s.counter == 10)
{
Console.WriteLine("disposing of timer");
s.tmr.Dispose();
s.tmr = null;
}
}
}
using System.Threading;
class TimerExampleState
{
public int counter = 0;
public Timer tmr;
}
class App
{
public static void Main()
{
TimerExampleState s = new TimerExampleState();
//创建代理对象TimerCallback,该代理将被定时调用
TimerCallback timerDelegate = new TimerCallback(CheckStatus);
//创建一个时间间隔为1s的定时器
Timer timer = new Timer(timerDelegate, s, 1000, 1000);
s.tmr = timer;
//主线程停下来等待Timer对象的终止
while (s.tmr != null)
Thread.Sleep(0);
Console.WriteLine("Timer example done.");
Console.ReadLine();
}
//下面是被定时调用的方法
static void CheckStatus(Object state)
{
TimerExampleState s = (TimerExampleState)state;
s.counter++;
Console.WriteLine("{0} Checking Status {1}.", DateTime.Now.TimeOfDay, s.counter);
if (s.counter == 5)
{
//使用Change方法改变了时间间隔
(s.tmr).Change(5000, 2000);
Console.WriteLine("changed");
}
if(s.counter == 10)
{
Console.WriteLine("disposing of timer");
s.tmr.Dispose();
s.tmr = null;
}
}
}
程序首先创建了一个定时器,它将在创建1秒之后开始每隔1秒调用一次CheckStatus()方法,当调用5次以后,在CheckStatus()方法中修改了时间间隔为2秒,并且指定在5秒后重新开始。当计数达到10次,调用Timer.Dispose()方法删除了timer对象,主线程于是跳出循环,终止程序。