Azure functions configure timer trigger from Azure App Configuration

Question

I'm doing an Azure Function that is timer triggered. I want to be able to change the timer, i.e the cron expression, without having to do a re-deploy. I'm getting my other settings from an App Configuration in Azure but this doesn't work for the TimerTrigger and I get : An object reference is required for the non-static field, method or property when I write TimerTrigger(config["CronExpression"]) where config is an IConfiguration. Does anyone know how to do this with Azure App Configuration? I wish to not use a settings.json file other than for local development

Possible duplicate of Dynamically set schedule in Azure Function — Martin Frøhlich

DavidG DavidG · Accepted Answer · 2019-11-21T16:18:16

You can specify the timer expression in your configuration by referencing the name surrounded by %...%. For example, in your configuration create a new value with a name of MyTimerExpression and value of, for example, 0 */10 * * * * to run every 10 minutes. In your local development environment, that means adding an entry into the local.settings.json file like this:

    {
        ...
        "MyTimerExpression": "0 */10 * * * *"
        ...
    }

Now in your timer trigger, do this:

    [TimerTrigger("%MyTimerExpression%")]

Azure functions configure timer trigger from Azure App Configuration

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