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MVC 3 - UrlParameter.Optional

Zilele astea am inceput sa ma uit peste MVC 3 si sa vad ce a adus nou. S-a scris foarte mult, nu am de gand sa desfac firul in patru cu fiecare lucru aparut in MVC 3. In schimb vreau sa va spun peste ce problema am dat.
In MVC 2 cand se declara un map route - unul sau mai multi parametrii pot sa fie optionali. In acest caz cand se face apelul unei actiuni, acesti parametri pot sa lipseasca.
De exemplu putem sa avem urmatoarea mapare:
controller = "Drive",
action = "Go",
numar = UrlParameter.Optional
bloc = UrlParameter.Optional
Antetul actiuni ar avea forma:
public ActionResult Go(string strada, int? numar,int? bloc);
Apelul spre aceste acțiuni am dorii sa fie de forma:
O sa observam ca pentru prima varianta http://localhost/drive/go?strada=Dunarii maparea pe care noi am declarato nu functioneaza. Aceasta problema apare cand avem doi parametrii optionali.
O solutie pentru aceasta problema este sa mai declaram o nou map route pentru cazul in care nici un parametrul optional nu este setat:
controller = "Drive",
action = "Go",


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