/// <summary>
/// 工作单元接口,定义一个计划任务必须完成的工作
/// </summary>
public interface IScheduledTask
{
/// <summary>
/// 任务执行
/// </summary>
void Execute();
}

/// <summary>
/// 用来执行计划任务的基本对象
/// </summary>
public class ScheduledTask
{
private static readonly ScheduledTask _ScheduledTask = null;
private Timer UpdateTimer = null;
/// <summary>
/// 间隔时间,单位为毫秒
/// </summary>
private int interval = 10 * 1000;
/// <summary>
/// 间隔时间,单位为毫秒
/// </summary>
public int Interval
{
get { return this.interval; }
set { this.interval = value; }
}
/// <summary>
/// 任务是否完成标志
/// </summary>
private int _IsRunning;
/// <summary>
/// 静态构造函数,保证实例的唯一性
/// </summary>
static ScheduledTask()
{
_ScheduledTask = new ScheduledTask();
}
/// <summary>
/// 任务队列
/// </summary>
private ArrayList tasks = new ArrayList();
/// <summary>
/// 任务队列
/// </summary>
public ArrayList Tasks { get { return tasks; } }
/// <summary>
/// 返回任务实例
/// </summary>
/// <returns></returns>
public static ScheduledTask Instance()
{
return _ScheduledTask;
}
/// <summary>
/// 执行任务
/// </summary>
public void Start()
{
if (UpdateTimer == null)
{
UpdateTimer = new Timer(new TimerCallback(UpdateTimerCallback), null, interval, interval);
}
}
/// <summary>
/// 任务处理
/// </summary>
/// <param name="sender"></param>
private void UpdateTimerCallback(object sender)
{
if (Interlocked.Exchange(ref _IsRunning, 1) == 0)
{
try
{
//执行多个任务
foreach (IScheduledTask task in Tasks)
{
ThreadStart myThreadDelegate = new ThreadStart(task.Execute);
Thread myThread = new Thread(myThreadDelegate);
myThread.Start();
}
}
catch (Exception ex)
{
//错误处理
CreateLog(ex.Message, true);
}
finally
{
Interlocked.Exchange(ref _IsRunning, 0);
}
}
}
/// <summary>
/// 取消任务
/// </summary>
public void Stop()
{
if (UpdateTimer != null)
{
UpdateTimer.Dispose();
UpdateTimer = null;
}
}
/// <summary>
/// 记录日志至文本文件
/// </summary>
/// <param name="message"></param>
/// <param name="iserror"></param>
public static void CreateLog(string message, bool iserror)
{
DateTime dt = DateTime.Now;
int y = dt.Year;//当前的年份
int m = dt.Month;//当前的月份
string root = HttpRuntime.AppDomainAppPath;
root += "ScheduledTaskLogs";
if (!File.Exists(root)) Directory.CreateDirectory(root);
string dir_y = root + "\\" + y.ToString();
string dir_m = dir_y + "\\" + m.ToString();
string err = iserror ? "_taskerror" : "_task";
string dirOk = dir_m + "\\" + dt.Year + dt.Month + dt.Day + err + ".txt";
//以当前年份为名创建新目录
if (!File.Exists(dir_y)) Directory.CreateDirectory(dir_y);
//以当前月份为名创建新目录
if (!File.Exists(dir_m)) Directory.CreateDirectory(dir_m);
string err1 = iserror ? "错误" : "";
if (File.Exists(dirOk))
{
StreamWriter sr = new StreamWriter(dirOk, true, Encoding.Default);
lock (sr)
{
sr.WriteLine();
sr.WriteLine("--------------计划任务" + err1 + "日志-----------------------------------------------------------------------");
sr.WriteLine(err1 + "时间: " + DateTime.Now.ToString());
sr.WriteLine("详细内容: " + message);
sr.WriteLine("--------------------------------------------------------------------------------------------");
}
sr.Close();
sr.Dispose();
}
else
{
StreamWriter sr = new StreamWriter(dirOk, false, Encoding.Default);
lock (sr)
{
sr.WriteLine();
sr.WriteLine("--------------计划任务" + err1 + "日志-----------------------------------------------------------------------");
sr.WriteLine(err1 + "时间: " + DateTime.Now.ToString());
sr.WriteLine("详细内容: " + message);
sr.WriteLine("--------------------------------------------------------------------------------------------");
}
sr.Close();
sr.Dispose();
}
}
}

/// <summary>
/// 计划任务--定时发送邮件
/// </summary>
public class Task_MailSend : IScheduledTask
{
public void Execute()
{
string nw = DateTime.Now.ToString("HH");
int hh = 0;
if (!Int32.TryParse(nw, out hh)) { return; }
//每天11-13点发送邮件
if (hh < 10 || hh > 17)
{
ScheduledTask.CreateLog("没到发送时间", true);
return;
}
DataTable dt = GetOrderedUser();
int num = dt.Rows.Count;
if (num == 0)
{
ScheduledTask.CreateLog("目前没有用户订阅", true);
return;
}
/*
mail发送程序。。。
*/
}

<script runat="server"><!--
void Application_Start(object sender, EventArgs e)
{
// 在应用程序启动时运行的代码
//WildRen.Common是我这里的命名空间
WildRen.Common.ScheduledTask.Instance().Interval = 12 * 60 * 60000;//设置计划任务执行时间间隔
WildRen.Common.ScheduledTask.Instance().Tasks.Add(new Task_MailSend());//向计划任务管理程序添加要执行的动作
WildRen.Common.ScheduledTask.Instance().Start();//启动任务
}
void Application_End(object sender, EventArgs e)
{
// 在应用程序关闭时运行的代码
WildRen.Common.ScheduledTask.Instance().Stop();
}
// --></script>