C#线程倒计时器源码分享

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace ListZZBG
{
class TimeHeleper
{
Thread thread;
private TimeSpan time; //计时时间 
private TimeSpan endTime; //到点时间 
private Label lb;
private bool whereExit = true;

/// <summary> 
/// 设定计时器计时的时间 
/// </summary> 
/// <param name="StartTime">计时器时间，如：01:00:00 既1小时</param> 
public TimeHeleper(TimeSpan StartTime, Label lb)
{
time = StartTime;
this.lb = lb;
}

public void ShowLabel()
{
lb.Text = time.ToString();
}

/// <summary> 
/// 获取时间 
/// </summary> 
/// <returns></returns> 
public TimeSpan GetTime()
{
return time;
}

/// <summary> 
/// 开启计时器 
/// </summary> 
public void Open()
{
//计算到点时间 
TimeSpan tsNow = TimeSpan.Parse(DateTime.Now.ToString("HH:mm:ss"));
TimeSpan tsAdd = time;
endTime = tsNow + tsAdd;
//线程开始 
whereExit = false;
thread = new Thread(TimeThreadStart);
thread.IsBackground = true;
thread.Start();
}

/// <summary> 
/// 关闭计时器 
/// </summary> 
public void Close()
{
whereExit = true;
thread.Join(1000);
}

private void TimeThreadStart()
{
while (!whereExit)
{
RunTime();
Thread.Sleep(1000);
}
}

private delegate void RunTimeDelegate();
private void RunTime()
{
if (lb.InvokeRequired)
{
RunTimeDelegate d = RunTime;
lb.Invoke(d);
}
else
{
time = endTime - TimeSpan.Parse(DateTime.Now.ToString("HH:mm:ss"));
string[] sp = time.ToString().Split(':');
lb.Text = sp[2].ToString(); //liable1控件
}
}
}

}