How can i set the api version on a generic controller when loading a plugin?

Question

I have some plugin's which are basically input and output type definitions. I have a generic controller which i can add to the mvc pipeline. All works fine.

but I'm having trouble setting the api version on this generic controller. I know you can set this based upon an attribute on top of the controller class. But since you can't have this dynamic (attribute) don't allow it, i have no way to set the version for each instance of the generic controller.

Currently i just compile the controller for each instance on runtime and register i using the roslyn compiler.

is there a way to set the api-version somewhere in the pipeline of registering controllers in the mvc pipeline and endup with different api versions endpoints.

Answer 1

This can be achieved by using the Conventions API. It was designed to support this exact type of scenario:

https://github.com/microsoft/aspnet-api-versioning/wiki/API-Version-Conventions

This will only work on closed-generics, but it shouldn't be too much work to make that happen. Here's a couple of basic examples:

// typed, closed generic
options.Conventions.Controller<GenericController<PlugIn1>>().HasApiVersion(1,0);

// untyped, closed generic
var controllerType = typeof(GenericController<>).MakeGenericType(new []{typeof(PlugIn1)});
options.Conventions.Controller(controllerType).HasApiVersion(1,0);

You can also author your own custom conventions a la IControllerConvention. This approach could be used to version all controllers that inherit from GenericController<>. Then you just need to add it to the conventions like this:

options.Conventions.Add(new PlugInControllerConvention());

Hopefully that's enough to get you started. Feel free to ask more questions.