TimerTrigger that executes instantly and then every 5 minutes

Question

In this document (Timer trigger for Azure Functions) the example they give executes the function every five minutes, starting with the minutes that end in 5 or 0. That's fine, but unless I'm missing something, this document does not explain the syntax of the trigger and how I can customize it.

  public static void Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, TraceWriter log)
  {
      ....
  }

For testing purposes on my localhost, this is really annoying to have wait until my clock time is a minute that ends in 5 or 0. I just want the function to execute immediately when run, and then again every five minutes after that. How would I modify this syntax accordingly?

Read more about CRON Expressions [here](https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-timer#cron-expressions) — Matt.G, Mar 26 '19 at 16:22
@Matt.G, ok yeah, I just didn't scroll down far enough in the document. However, I think I need to set 'RunOnStartup' to true. Just gotta figure out how to do that. — Casey Crookston, Mar 26 '19 at 16:32

score 7 · Accepted Answer · answered Mar 26 '19 at 16:25

7

Just pass RunOnStartup = true when using the attribute:

[TimerTrigger("0 */5 * * * *", RunOnStartup = true)]

answered Mar 26 '19 at 16:25

haim770

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Sorry @Matt.G. Every five minutes after startup is fine. Typo in OP. Fixed – Casey Crookston Mar 26 '19 at 16:29
@haim770: "The type or namespace RunOnStartup could not be found" – Casey Crookston Mar 26 '19 at 16:29
Ah, ok. I misread this at first glance. Yes, this is the answer. I'll just need to figure out how to set it to False in prod. – Casey Crookston Mar 26 '19 at 16:35
How about `if #DEBUG`? – haim770 Mar 26 '19 at 16:38
Ok, not getting it figured out! https://stackoverflow.com/questions/55362558/programmatically-set-runonstartup-in-azure-function – Casey Crookston Mar 26 '19 at 17:01
Just wante to mention that Azure recommends to NOT use `RunOnStartup` in production – Jonathan Jun 26 '23 at 14:12

TimerTrigger that executes instantly and then every 5 minutes

1 Answers1