Add slug automatically for each action [duplicate] - asp.net

Question

I need to implement SO like functionality on my asp.net MVC site.
For example when user go to https://stackoverflow.com/questions/xxxxxxxx
after loading the subject line is concatenated with the url and url becomes like this https://stackoverflow.com/questions/xxxxxxxx/rails-sql-search-through-has-one-relationship
Above "/rails-sql-search-through-has-one-relationship " part is added to the url.
In webforms it's simple, I could just use url rewriting. But not sure how to accomplish this in MVC
The following line is from Global.asax file
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Account", action = "LogOn", id = UrlParameter.Optional } // Parameter defaults
);
the string that I need to concatenate is in my database so it fetches from there. How can I accomplish this?

Answer 1

This is called a slug route. One way to achieve this is to define a route with an optional slug parameter, and in the controller method check if the parameter has been provided
routes.MapRoute(
name: "Question",
url: "Question/{id}/{slug}",
defaults: new { controller = "Question", action = "Details", slug = UrlParameter.Optional }
);
Then in QuestionController (assumes an id will always be provided)
public ActionResult Details (int id, string slug)
{
if (string.IsNullOrEmpty(slug))
{
// Look up the slug in the database based on the id, but for testing
slug = "this-is-a-slug";
return RedirectToAction("Details", new { id = id, slug = slug });
}
var model = db.Questions.Find(id);
return View(model);
}

Answer 2

You are looking for a custom route. If you look closely, SO doesn't care about the text part of the URL. So:
http://stackoverflow.com/questions/xxxxxxxx/rails-sql-search-through-has-one-relationship
AND
http://stackoverflow.com/questions/xxxxxxxx/
Will both work. You can easily do that with something like:
routes.MapRoute(
"Question",
"questions/{id}/{title}",
new { controller = "Question", action = "Details" });
The trick is add the "slug" at the end when you create links:
#Html.RouteLink(
"Read more.",
"Question",
new { id = question.Id, title = Slugger.ToUrl(question.Title) })