Default values for attribute routing are ignored, after migrating from ASP.NET Core RC2 to RTM

[lalibi]

Code like the following, used to work with RC2, and the default value (=1) was honored.

[Route("[controller]/[action]")]
public class FooController : Controller
{
    [HttpGet("{id:int=1}")]
    public IActionResult Bar(int id)
    {
        ViewData["Message"] = $"Id: {id}";
        return View();
    }
}

With RC2, URLs /Foo/Bar/1 and /Foo/Bar gave the same results. After upgrading To RTM, /Foo/Bar gives a 404 error.

[javiercn]

Its a known bug in atribute routing. The workaround is to use two routes and provide the default value in the method parameter. See aspnet/Routing#324

[ststeiger]

Instead of fixing the bug...

[javiercn]

This bug was fixed as of aspnet/Routing@ffa0ee5