RedirectToAction for index to go to example.com/controller/id

Question

We are using a controller which has an "Index" action:

[Route("")]
[Route("Index/{id:int?}")]
[Route("{id:int?}")]    
public ActionResult Index(int? id)
    {
         var viewModel = new GroupViewModel();
....
        return View("Index", viewModel);

    }

We can get to this action by using example.com/my/ or example.com/my/index or example.com/my/index/1. This works as we want. Now we want to redirect to this using the example.com/my/index/1 syntax.

When we execute this line:

return RedirectToAction("Index", "My", new { id = 3 });

It will redirect using this url:

example.com/my?id=3

We want it to use example.com/my/index/1 instead.

Does anybody know of a way to force RedirectToAction to use this convention without the question mark?

Updated 5/2/17 to correct controller names per comments below

Answer 1

You need to tell which route template you need to use for generating the URL for the redirection. For the moment you haven't an URL template that can generate a URL like /my/index/1 which is "My/Index/{id:int?}"

First,add that route template to your action and set the Name property of that route like this:

[Route("")]
[Route("Index/{id:int?}")]
[Route("My/Index/{id:int?}", Name = "MyCompleteRouteName")]
[Route("{id:int?}")]    
public ActionResult Index(int? id)
{
     var viewModel = new GroupViewModel();
....
     return View("Index", viewModel);
}

Second, you must RedirectToRoute instead of RedirectToAction. RedirectToRoute let you choose which template you want by giving its name.

So you must call this line :

RedirectToRoute("MyCompleteRouteName",  new { id = 3 });

Instead of

RedirectToAction("Index", "My", new { id = 3 });