最近做了一個需要和Windows Schedule task相關的功能，即通過schedule，計算下次跑task的時間。
通過是用第三方的DLL來實現，從下面的網站下載：
http://taskscheduler.codeplex.com/
1. 在Schedule Task裏增加一個task，命名爲“testJing”, trigger設置爲每五天
增加一個Trigger，如下圖：
2. 使用VS2012，創建一個Console Application，命名爲ScheduleTaskDemo
3.添加引用。 從上述的網站下載（http://taskscheduler.codeplex.com/releases/view/120747），解壓後，找到Microsoft.Win32.TaskScheduler.dll（我用的是v4.0文件夾下的，我建的application的.NET framework 4.5）
4. 打開program.cs文件，代碼如下：
方法一：
using Microsoft.Win32.TaskScheduler;
using System;
public static void Main(string[] args)
{
using (TaskService ts = new TaskService())
{
Task task = ts.FindTask("testJing");
DateTime nextRunTime = task.NextRunTime;
Console.WriteLine("NextRunTime:" + nextRunTime);
}
}
NextRunTime 即可獲取下次跑task的時間。
這是直接用Task的屬性NextRunTime，下面是我自己寫的方法獲取next run time.
方法二：使用Task裏的一系列屬性來計算，代碼如下：
public static void Main(string[] args)
{
try
{
DateTime? beginDateGMT = null;
DateTime? endDateGMT = null;
GetDaysInterval(out beginDateGMT, out endDateGMT);
if (!beginDateGMT.HasValue || !endDateGMT.HasValue)
{
throw new Exception("BeginDateGMT(" + beginDateGMT + ") or EndDateGMT(" + endDateGMT + ") is null. Please check schedule setting.");
}
else
{
Console.WriteLine("BeginDateGMT:" + beginDateGMT + ", EndDateGMT:" + endDateGMT);
}
}
catch (Exception ex)
{
throw;
}
Console.Read();
} private static void GetDaysInterval(out DateTime? beginDateGMT, out DateTime? endDateGMT)
{
using (TaskService ts = new TaskService())
{
Task task = ts.FindTask("testJing");
TaskTriggerType taskTriggerType = task.Definition.Triggers[0].TriggerType;
//// get current day, e.g. 2014/11/10 00:00:00
DateTime nowGMT = DateTime.Now;
nowGMT = new DateTime(nowGMT.Year, nowGMT.Month, nowGMT.Day, 0, 0, 0);
beginDateGMT = nowGMT;
endDateGMT = null;
switch (taskTriggerType)
{
case TaskTriggerType.Daily:
DailyTrigger dailyTrigger = task.Definition.Triggers[0] as DailyTrigger;
if (dailyTrigger.DaysInterval > 0)
{
endDateGMT = beginDateGMT.Value.AddDays(dailyTrigger.DaysInterval);
}
else
{
throw new Exception("ScheduleType is daily, but daysInterval <= 0.");
}
break;
case TaskTriggerType.Weekly:
WeeklyTrigger weeklyTrigger = task.Definition.Triggers[0] as WeeklyTrigger;
if (weeklyTrigger.WeeksInterval > 0)
{
endDateGMT = beginDateGMT.Value.AddDays(weeklyTrigger.WeeksInterval * 7);
}
else
{
throw new Exception("ScheduleType is weekly, but weeksInterval <= 0.");
}
break;
case TaskTriggerType.MonthlyDOW:
case TaskTriggerType.Monthly:
switch (taskTriggerType)
{
case TaskTriggerType.Monthly:
MonthlyTrigger monthlyTrigger = task.Definition.Triggers[0] as MonthlyTrigger;
endDateGMT = beginDateGMT.Value.AddMonths(1);
break;
case TaskTriggerType.MonthlyDOW:
MonthlyDOWTrigger monthlyDOWTrigger = task.Definition.Triggers[0] as MonthlyDOWTrigger;
if ((monthlyDOWTrigger.WeeksOfMonth == WhichWeek.FirstWeek
|| monthlyDOWTrigger.WeeksOfMonth == WhichWeek.SecondWeek || monthlyDOWTrigger.WeeksOfMonth == WhichWeek.ThirdWeek
|| monthlyDOWTrigger.WeeksOfMonth == WhichWeek.FourthWeek || monthlyDOWTrigger.WeeksOfMonth == WhichWeek.LastWeek)
&& (monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Sunday
|| monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Monday || monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Tuesday
|| monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Wednesday || monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Thursday
|| monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Friday || monthlyDOWTrigger.DaysOfWeek == DaysOfTheWeek.Saturday))
{
DateTime nextMonthFirstDay = new DateTime(beginDateGMT.Value.AddMonths(1).Year, beginDateGMT.Value.AddMonths(1).Month, 1, 0, 0, 0);
DateTime nextMonthLastDay = nextMonthFirstDay.AddMonths(1).AddDays(-1);
if (monthlyDOWTrigger.WeeksOfMonth == WhichWeek.LastWeek)
{
DayOfWeek? dayOfWeek = GetDayOfWeek(monthlyDOWTrigger.DaysOfWeek);
while (nextMonthLastDay >= nextMonthFirstDay)
{
if (nextMonthLastDay.DayOfWeek == dayOfWeek.Value)
{
endDateGMT = nextMonthLastDay;
break;
}
nextMonthLastDay = nextMonthLastDay.AddDays(-1);
}
}
else
{
//// weeksOfMonth: 1,2,3,4; daysOfWeekForMonth:7,1,2,3,4,5,6;
int weeksOfMonthInt = 0;
switch (monthlyDOWTrigger.WeeksOfMonth)
{
case WhichWeek.FirstWeek:
weeksOfMonthInt = 1;
break;
case WhichWeek.SecondWeek:
weeksOfMonthInt = 2;
break;
case WhichWeek.ThirdWeek:
weeksOfMonthInt = 3;
break;
case WhichWeek.FourthWeek:
weeksOfMonthInt = 4;
break;
default:
weeksOfMonthInt = 0;
break;
}
if (weeksOfMonthInt > 0 && weeksOfMonthInt <= 4)
{
DayOfWeek? dayOfWeek = GetDayOfWeek(monthlyDOWTrigger.DaysOfWeek);
int countDayOfWeek = 0;
while (nextMonthLastDay >= nextMonthFirstDay)
{
if (nextMonthFirstDay.DayOfWeek == dayOfWeek)
{
countDayOfWeek++;
if (countDayOfWeek == weeksOfMonthInt)
{
endDateGMT = nextMonthFirstDay;
break;
}
}
nextMonthFirstDay = nextMonthFirstDay.AddDays(1);
}
}
else
{
throw new Exception("ScheduleType is monthly, but weeksOfMonth is not between 1 and 4.");
}
}
}
else
{
throw new Exception("ScheduleType is monthly, but weeksOfMonth or daysOfWeekForMonth has multiple values.");
}
break;
default:
throw new Exception("ScheduleType is monthly, but scheduleByMonthType is " + taskTriggerType + ".");
}
break;
default:
throw new Exception("ScheduleType(" + taskTriggerType + ") is not in (Daily;Weekly;Monthly;).");
}
}
} private static DayOfWeek? GetDayOfWeek(DaysOfTheWeek daysOfTheWeek)
{
DayOfWeek? dayOfWeek = null;
switch (daysOfTheWeek)
{
case DaysOfTheWeek.Sunday:
dayOfWeek = DayOfWeek.Sunday;
break;
case DaysOfTheWeek.Monday:
dayOfWeek = DayOfWeek.Monday;
break;
case DaysOfTheWeek.Tuesday:
dayOfWeek = DayOfWeek.Tuesday;
break;
case DaysOfTheWeek.Wednesday:
dayOfWeek = DayOfWeek.Wednesday;
break;
case DaysOfTheWeek.Thursday:
dayOfWeek = DayOfWeek.Thursday;
break;
case DaysOfTheWeek.Friday:
dayOfWeek = DayOfWeek.Friday;
break;
case DaysOfTheWeek.Saturday:
dayOfWeek = DayOfWeek.Saturday;
break;
default:
throw new Exception("ScheduleType is monthly, but daysOfWeek is not between Sunday and Saturday.");
}
return dayOfWeek;
}運行，即可。結果和方法一是一樣的。
注意：方法二里，對於Monthly裏，不支持選擇months。自己可自行擴展。