asp.net mvc - After a change to the default routing map my actionlinks stopped working -

i made change routing map following now:

routes.maproute(                 name: "default",                 url: "{controller}/{action}/{id}/{title}",                 defaults: new { controller = "home", action = "index", id = urlparameter.optional, title = urlparameter.optional }             ); 

and actionlinks not working anymore:

@html.actionlink("category", "categorylist", "category") 

when click on actionlink nothing happens url stays same http://localhost:62394/ page reloads. weird

and when check html looks this:

<a href="">category</a> 

any kind of or tips appreciate alot!

note: if remove title routing works...

it's because you've got 2 optional parameters routing engine doesn't know 1 map third parameter to. feels title going used specific route rather generic one. if that's case, why not create specific route , remove generic fallback route?

something this:

routes.maproute(             name: "title",             url: "category-list/{title}",             defaults: new { controller = "category", action = "categorylist", title = urlparameter.optional }         ); routes.maproute(             name: "default",             url: "{controller}/{action}/{id}",             defaults: new { controller = "home", action = "index", id = urlparameter.optional }         );