How do I get the whole route collection in an Action Filter?

[brainwipe]

I am working on a .NET core implementation of the hypermedia JSONApi standard. I need to generate the hypermedia links, for which I need the route dictionary (to use old terms).

A custom ActionFilterAttribute is added as a global service, and performs the custom transform on OnActionExecuted. I want to hand the custom transformer a route collection so that it can work out the URIs to the actions it needs. These actions could be in other controllers not part of the request.

I believe that this will be done by dependency injecting a service (or Application Model?) into the constructor but I cannot find the relevant service to inject.

How do I get the route collection in the action filter?

Thank you!

[davidfowl]

/cc @rynowak

[brainwipe]

I'm stuck without the route collection. Is it possible to get a hint or a pointer in the right direction?

[rynowak]

You can get at the route collection in an action filter through context.RouteData.Routers[0], but I'm not sure that will do what you want.

If this is for APIs you might want to start by looking at IApiDescriptionGroupCollectionProvider in the api explorer package.

[brainwipe]

Thank you! I'll get digging.

I very much appreciate the help.

[rynowak]

I'm going to close this bug since I answered your original question. If you run into trouble or need more answers please open issues on aspnet/Mvc

[brainwipe]

For anyone else stopping by looking for the route collection, thanks to @rynowak I found my answers on this test Mvc Website:

https://github.com/aspnet/Mvc/tree/dev/test/WebSites/ApiExplorerWebSite

The steps are:

• Ensure your API controllers are marked either by [ApiExplorerSettings(GroupName = "NameOfYourGroup")] or by making a convention to register them all and adding the convention to your .AddMvc() options in Startup.cs.
• In your custom action filter, add IApiDescriptionGroupCollectionProvider to your constructor and assign to an internal member variable.
• That member variable will then contain all the controllers/actions/methods/everything you need inside ApiDescriptionGroups.