C# Custom Map Routes / View Paths / Link Generation

Question

Issue/Try 1:
I have a custom route map:

routes.MapRoute(
    name: "User Profile",
    url: "User/{userId}/{controller}/{action}/{id}",
    defaults: new { Areas = "User", controller = "Kpi", action = "Index", id = UrlParameter.Optional }
);

If i manually navigate to the URL /User/f339e768-fe92-4322-93ca-083c3d89328c/Kpi/View/1 the page loads with a View Error: The view 'View' or its master was not found or no view engine supports the searched locations .

Issue/Try 2:
Stopped using the custom route and set up my controller as instead:

    [RouteArea("User")]
    [RoutePrefix("{userId}/Kpi")]
    public class KpiController : BaseUserController
    {
        [Route("View/{id}")]
        public async Task<ActionResult> View(string userId, int? id = null)
        {
            [...]
        }
    }

This now works i can navigate to the URL and the View displays fine.

Issue for both:
Although I can navigate manually to both and they load I can't seem to generate the URL correctly using ActionLink :

@Html.ActionLink(kpi.GetFormattedId(), "View", "Kpi", new { Area = "User", userId = Model.Id, id = kpi.Id }, null)

It generates: /User/Kpi/View/1?userId=f339e768-fe92-4322-93ca-083c3d89328c instead of /User/f339e768-fe92-4322-93ca-083c3d89328c/Kpi/View/1

Answer 1

URL Mapping
After some time i have found the solution for the custom mapping i was adding in the main RouteConfig.cs and not in the Area Registration. Moving the MapRoute to the Area works correctly and without the RouteArea , RoutePrefix and Route attributes in the Controller.

Area Registration

public class UserAreaRegistration : AreaRegistration 
{
    public override string AreaName => "User";

    public override void RegisterArea(AreaRegistrationContext context)
    {
        context.MapRoute(
            name: "User",
            url: "User/{userId}/{controller}/{action}/{id}",
            defaults: new { action = "Index", id = UrlParameter.Optional }
        );

        context.MapRoute(
            "User_default",
            "User/{controller}/{action}/{id}",
            new {action = "Index", id = UrlParameter.Optional}
        );
    }
}

Links
Instead of using ActionLink i am now using RouteLink .

@Html.RouteLink("KPIs", "User", new { Controller = "Kpi", Action = "Index", userId = Model.Id })