How can I add an alternative route to a controller method in MVC Core to support a legacy endpoint

Question

The following code I am trying is changing the route so that it is only accessible via [Area]/[Controller]/DailyStatusSummary - is there any way to just add it as an alternative route?

    [HttpGet("[Area]/[Controller]/DailyStatusSummary")]

    public async Task<IActionResult> CompanyStatusSummary()
    { 
        ... etc.

Background: I used to have a controller action named DailyStatusSummary. I have refactored my code to give better names to actions, and this means this action in particular is now called CompanyStatusSummary. I am wary some users have bookmarks to the old DailyStatusSummary endpoint as it's a popular page, so I am trying to add this as an alternative route (so if you navigate to either the old or new endpoint, it hits the CompanyStatusSummary action.)

Answer 1

In App_Start\RouteConfig.cs you can create a specific route. Assuming your area is "areaABC" and your controller is "controllerXYZ", and only the action changes, something like this may work:

routes.MapRoute(
    name: "Alternate",
    url: "areaABC/controllerXYZ/DailyStatusSummary",
    defaults: new { area = "areaABC", controller = "controllerXYZ", action = "CompanyStatusSummary"}
);

And the action in the controller should keep the CompanyStatusSummary (or remove if catched with generic route):

[HttpGet("[Area]/[Controller]/CompanyStatusSummary")]

public async Task<IActionResult> CompanyStatusSummary()
{ 

For .Net Core 3.1, the route mapping should be done in app.UseEndpoints, mapping the controller route:

endpoints.MapControllerRoute(
    name: "Alternate",
    pattern: "areaABC/controllerXYZ/DailyStatusSummary",
    defaults: new { area = "areaABC", controller = "controllerXYZ", action = "CompanyStatusSummary" });