Retaining route details on MVC Form Postback

I have a basic MVC form which is accessed through a GET Action with 3 string parameters pulled from the route.

[HttpGet]
 public ActionResult Application(string x, string y, string z)
 {
     //create model, setup form, etc...
 
     return View(model);
 }
 

The route to access this form is configured as follows:

routes.MapRoute("Application", 
     "application/{x}/{y}/{z}",
     new
     {
         controller = "Application",
         action = "Application",
         x = "",
         y = "",
         z = ""
     }); 
 

And the form is configured as follows:

Html.BeginForm("Application", "Application", FormMethod.Post)
 

All of this works until I click submit on the resulting form. From a routing perspective the correct POST Action is called and the Model is bound correctly. The problem is I have lost all the x/y/z route information which I still need. How can I preserve the route information?

I've tried a couple things:

• Added route details to the Form in Hidden fields which are added to the form content correctly but never get returned in the Model on postback


• Tried using the RouteValueDictionary overload for Html.BeginForm but can't figure out how to make it work. I may just need a proper example of how to use it and how to access the state from the Controller

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