How to write an Http Trigger Azure Function with output binding?

Question

All the Http Trigger samples in the documentation are implemented as async function which doesn't support [out] parameter. Does that mean output binding is not available to any Http/Webhook triggers?

Fabio Cavalcante · Accepted Answer · 2016-12-13 19:12:54Z

2

Vincent,

Although the documentation and templates show functions using async methods, that's mostly because of some of the scenarios they cover. Functions are not required to be async, you're also not required to return a Task from your HTTP or WebHook trigger functions and can change them to void (or an appropriate type), so you can change the method signature to meet your requirements.

Also, bindings only require out parameters for some parameter types. Most bindings support multiple types. A detailed description of the most common bindings and their supported types is available here: https://1drv.ms/b/s!Am_1X5sjRkhpgQUscoXoIk6dpI34

I hope this helps!

edited Dec 13, 2016 at 19:12

answered May 21, 2016 at 3:14

Fabio Cavalcante

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3 Comments

Vincent Leung Over a year ago

Fabio, after I removed the async await pair from the the code, everything works. Thanks for pointing out the webjob documentation, a reminder that Azure function is built on top of WebJob.

avs099 Over a year ago

Fabio, link is dead - do you mind updating it please?

Fabio Cavalcante Over a year ago

Thanks for letting me know. For some reason, the document has been removed, so I've updated the link pointing to a copy I have shared. Let me know if you have any issues with it.

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