How to define an endpoint route to multiple areas

Question

I am trying to define a MapAreaControllerRoute() that routes to multiple Areas. In ASP.NET Core 3.0, however, there is the areaName: parameter that

Answer 1

Ok, so after reading an additional bunch of links, it turns out to be a case of missing attributes for the area controllers! By tagging the controllers with the following tags:

[Area("Area1")]
[Route("Area1/[controller]/[action]")]
public class Area1Controller : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}

and changing the routes to:

        app.UseEndpoints(endpoints =>
        {
                endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller=Home}/{action=Index}/{id?}");

            endpoints.MapAreaControllerRoute(
                name: "areas",
                areaName: "areas",
                pattern: "{area}/{controller=Home}/{action=Index}/{id?}"
                );
    }

everything seems to work as expected.

Answer 2

You can write a generic pattern for areas using MapControllerRoute():

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllerRoute(
        name: "areas",
        pattern: "{area:exists}/{controller=Home}/{action=Index}/{id?}"
    );
    endpoints.MapDefaultControllerRoute();
});

Then the area controllers just need the Area attribute:

[Area("AreaName")]
public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}