| public GetTimeAfter ( DateTimeOffset afterTimeUtc ) : DateTimeOffset? | ||
| afterTimeUtc | DateTimeOffset | The UTC time to start searching from. |
| return | DateTimeOffset? | |
public DateTimeOffset GetNextScheduleFromQuartzExpression(DateTimeOffset withinThisMinute)
{
var expression = new CronExpression(job.Crontab);
var startMinute = new DateTimeOffset(withinThisMinute.Year, withinThisMinute.Month, withinThisMinute.Day, withinThisMinute.Hour, withinThisMinute.Minute, 0, 0, withinThisMinute.Offset);
startMinute = startMinute.AddMilliseconds(-1);
var result = DateTimeOffset.MinValue;
var nextOccurrence = expression.GetTimeAfter(startMinute.ToUniversalTime());
if (nextOccurrence.HasValue)
{
var isWithinTheNextMinute = 60 > Math.Abs((nextOccurrence.Value.LocalDateTime - startMinute).TotalSeconds);
Trace.WriteLine("CronExp: Id {0} ('{1}'): '{2}' [{3}].", job.Id, job.Crontab, nextOccurrence.Value.ToString("yyyy-MM-dd HH:mm:sszzz"), isWithinTheNextMinute);
if (isWithinTheNextMinute)
{
result = nextOccurrence.Value.LocalDateTime;
}
}
else
{
Trace.WriteLine("CronExp: Id {0} ('{1}'): '{2}' [{3}].", job.Id, job.Crontab, result.ToString("yyyy-MM-dd HH:mm:sszzz"), false);
}
return result;
}
public void TestCronExpression()
{
//[秒] [分] [小时] [日] [月] [周] [年]
//实例化表达式类，把字符串转成一个对象
CronExpression expression = new CronExpression("0 15 10 * * ? 2012");
while (true)
{
DateTimeOffset utcNow = SystemTime.UtcNow();
Console.WriteLine("UtcNow - " + utcNow);
//Console.WriteLine("GetFinalFireTime - " + expression.GetFinalFireTime());这个方法没有实现
//得到给定时间下一个无效的时间
Console.WriteLine("GetNextInvalidTimeAfter - " + expression.GetNextInvalidTimeAfter(utcNow));
//得到给定时间的下一个有效的时间
Console.WriteLine("GetNextValidTimeAfter - " + expression.GetNextValidTimeAfter(utcNow));
//得到给定时间下一个符合表达式的时间
Console.WriteLine("GetTimeAfter - " + expression.GetTimeAfter(utcNow));
//Console.WriteLine("GetTimeBefore - " + expression.GetTimeBefore(utcNow));这个方法没有实现
//给定时间是否符合表达式
Console.WriteLine("IsSatisfiedBy - " + expression.IsSatisfiedBy(new DateTimeOffset(2012, 4, 6, 2, 15, 0, TimeSpan.Zero)));
Console.WriteLine(expression.TimeZone);
Console.WriteLine("------------------------------------");
Console.WriteLine(expression.GetExpressionSummary());
Console.Read();
}
}