[Visual Studio] How do perform dependency injection?

[RPM1984]

Hi,

What's the recommended way to do DI in the new Azure Functions model?

I've seen mentions of the Service Locator pattern.

Any recommended samples/packages/code we should follow?

Is this the correct way? (not sure if still relevant)

Thanks

[slideep]

Excellent question, I've been tinkering with this also. I'm using a sortish of an Service Locator anti pattern which feels dirty, where say, ServiceConfigurator (the locator) class has static access to service objects configured into ServiceCollection and those are accessed via IServiceProvider contained services lazily after the provider has built up itself. ConfigurationBuilder builds up the app's configuration from variety of sources etc. Pretty much standard stuff where you build up the container. It does it's job for now but a proper 'bring your container' type of solution would be better if function app platform provides it. Hopefully you get the rough idea. Good luck! Pseudo snippets below..

private void ConfigureServices(IServiceCollection services)

ServiceProvider = services.BuildServiceProvider();

public static ISomeService<SomeContext> SomeService =>
    Configurator.Value.ServiceProvider.GetService<ISomeService<SomeContext>>();

[mack0196]

Is there a path for azure function projects to use dependency injection similar to the way webjobs can with IJobActivator?

[imsam67]

This is an important feature. Please move this up in your priorities list! Thank you!

[BorisWilhelms]

There is actually a quite nice way to add dependency injection to your functions: https://blog.wille-zone.de/post/azure-functions-dependency-injection/

[RizwanSharp]

@BorisWilhelms Very cool, Any idea how it is going to work without Attribute i.e using function.json?

Thank You.

[RPM1984]

@BorisWilhems yeah that's really nice! I'm surprised Microsoft hadn't issued any official advice/code/packages to cater for this, seems a very common requirement.

@lindydonna hi :) question - any movement on this internally? What's the current recommendation from Azure? Thanks!

[BorisWilhelms]

@RizwanSharp Unfortunately I don't know how to make this work without attributes.

I have created a follow up post, with support for scoped services! https://blog.wille-zone.de/post/azure-functions-proper-dependency-injection/

[imsam67]

Any idea on when DI would be supported in Azure Functions out of the box?

[alexkarcher-msft]

Linking this issue to UserVoice. DI is one of our top requested features there.

[baharedankoyuncu]

Is there an ETA? The UserVoice link requires login/signup which doesn't work for me :/

[thomasddn]

@bahagiga The correct UserVoice link is https://feedback.azure.com/forums/355860-azure-functions/suggestions/15642447-enable-dependency-injection-in-c-functions.

[baharedankoyuncu]

@thomasddn cheers buddy 👍

[yuka1984]

I thought about an idea to do injection setting by function.
https://medium.com/@yuka1984/azure-functions-dependency-injection-with-injection-config-87fe5762c895