How to use a controller in another assembly in ASP.NET Core MVC 2.0?

For the sake of modularity, I have created some controllers in different assemblies. Each assembly represents a bounded context (a module, a sub-system, a division, etc.) of the overall system.

Each module's controllers are developed by someone that knows nothing about other modules, and a central orchestrator is about to cover all these modules in one single application.

So, there is this module called school, and it has a TeacherController in it. The output of it is Contoso.School.UserService.dll.

The main orchestrator is called Education and it has a reference to Contoso.School.UserService.dll.

My program.cs is:

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args).UseKestrel()
            .UseStartup<Startup>()
            .Build();

Yet for the routes of teacher controller, I get 404. How to use controllers in other assemblies?

Solution

Inside the ConfigureServices method of the Startup class you have to call the following:

services.AddMvc().AddApplicationPart(assembly).AddControllersAsServices();

Where assembly is the instance Assembly representing Contoso.School.UserService.dll.

You can load it either getting it from any included type or like this:

var assembly = Assembly.Load("Contoso.School.UserService");