问题
I have written following functions in continuous web job :
public static void fun1([TimerTrigger("24:00:00", RunOnStartup = true, UseMonitor = true)] TimerInfo timerInfo, TextWriter log)
{//Code}
public static void fun2([TimerTrigger("00:01:00", RunOnStartup = true, UseMonitor = true)] TimerInfo timerInfo, TextWriter log)
{//code}
where, fun1 is not getting called again (only once, after starting web job) and fun2 is getting called with 1 min trigger after every process gets completed.
can anyone please explain why? Am I doing anything wrong?
回答1:
You should have a look at the documentation of the TimerTriggerAttribute:
- The first parameter you specified is the schedule expression: This can either be a 6 field crontab expression or a System.TimeSpan.
A Cron expression can be represented like that:
* * * * * * command to be executed
┬ ┬ ┬ ┬ ┬ ┬
│ │ │ │ │ │
│ │ │ │ │ │
│ │ │ │ │ └───── day of week (0 - 7) (0 or 7 are Sunday, or use names)
│ │ │ │ └────────── month (1 - 12)
│ │ │ └─────────────── day of month (1 - 31)
│ | └──────────────────── hour (0 - 23)
│ └───────────────────────── min (0 - 59)
└────────────────────────────── second(0 - 59)
In you case, the expression is a string represening a TimeSpan :
"24:00:00": this job is running every 24 hours,RunOnStartup: this means the job will run when the webjob starts or restarts even if the last run occured in the last 24 hours."00:01:00": this job is running every minute,RunOnStartup: this means the job will run when the webjob starts or restarts even if the last run occured in the last minute.
EDIT
From this answer:
- TimerTrigger - TimeSpan "24:00:00" - The next 5 occurrences as being 24 days apart
This is due to the way TimeSpan.Parse works. If you pass it "24:00:00" strangely enough it will give you back a TimeSpan of duration 24 days. Not sure if this is their intended behavior or a bug on their side, but we simply pass the expression down to them and inherit their behavior. Anyhow, for your purposes, to get 24 hours you can use "1.00:00" (specifying 1 day).
来源：https://stackoverflow.com/questions/36218203/continuous-webjob-with-timer-trigger