ASP.NET MVC URL Routing with Multiple Route Values

Question

I am having trouble with Html.ActionLink when I have a route that takes more than one parameter. For example, given the following routes defined in my Global.asax file:

routes.MapRoute(     "Default",                                              // Route name     "{controller}.mvc/{action}/{id}",                           // URL with parameters     new { controller = "Home", action = "Index", id = "" }  // Parameter defaults );  routes.MapRoute(     "Tagging",     "{controller}.mvc/{action}/{tags}",     new { controller = "Products", action = "Index", tags = "" } );  routes.MapRoute(     "SlugsAfterId",     "{controller}.mvc/{action}/{id}/{slug}",     new { controller = "Products", action = "Browse", id = "", slug = "" } ); 

The first two routes work without a problem, but when I try to create an action link to the third route using:

<%= Html.ActionLink(Html.Encode(product.Name), "Details", new { id = product.ProductId, slug = Html.Encode(product.Name) }) %> 

I end up with a URL like [site-root]/Details/1?slug=url-slug whereas I would like the URL to be more like [site-root]/Details/1/url-slug

Can anyone see where I am going wrong?

Answer 1

It is using the first route that is fully satisfied. Try putting your SlugsAfterId route above the Default one.

It's basically going: "Check Default. Got an action? Yes. Got an id? Yes. Use this one and chuck any other parameters in the querystring."

As a side note, doing that will make your Default route redundant as you provide a default value for the slug parameter.

Answer 2

Garry (above) is correct. You can use Mr. Haack's route debugger for MVC. It can help resolve routing issues by showing you which routes are hit and when.

Here is the Blog Post. And here is the Zip File.