How can i put the CRON expression in a Function app parameter in the local.settings.json file?

Question

I have a function app that i run and one of the functions is as follows:

    [Function("JobsTrigger")]
    public void Run([TimerTrigger("1,31 * * * * *", RunOnStartup = true)] MyInfo myTimer)
    {
          <rest of code>
    }

Now how can i put the CRON expression "1,31 * * * * *" in the local.settings.json file and when i deploy to put in the appsettings.json file ?

So in other words when the function app starts up i want to read that parameter setting from the appsettings.json file ?

Answer 1

You can define your CRON expression in local.settings.json:

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "YourSchedule": "1,31 * * * * *"
  }
}

and then you should be able to reference it by name in your Azure Function:

[Function("JobsTrigger")]
public void Run([TimerTrigger("%YourSchedule%", RunOnStartup = true)] MyInfo myTimer)
{
    // <rest of the code>
}