how to add default parameters to attribute routes in asp.net mvc

Question

I am trying to change this convention based route:

routes.MapRoute(
    \"MovieByReleaseDate\",
    \"movies/released/{year}/{month}\",
    new { controller          


        

Answer 1

You can define route constriants in attributte routing to allow only some value

[Route("movies/released/{year:regex(2015|2016)}/{month:regex(\\d{2}):range(1,12)}")]
    public ActionResult ByReleasedDate(int year, int month)
    {
        return Content($"year {year} and month {month}");
    }

by using {year:regex(2015|2016)} it allows only 2015 or 2016 in year parameter

by using {month:regex(\\d{2}):range(1,12)} it allows only 2 digit for month and range from 1 to 12

Hope this helps