Title left blank since I can't think of non inflammatory title for this post

time to read 1 min | 190 words

This works:


This doesn't:


I haven't bothered to find why, but that is surprising to me. (Note that here the enctype is specified as "multipart/form-data", which may or may not be related)

Update: It is not related.

The real culprit, as best I was able to reconstruct is because of this piece of code:

public static void RegisterRoutes(RouteCollection routes)

        new {controller = "Home", action = "Index", id = String.Empty} 

It looks fairly innocuous, doesn't it?

Except that this means that when ASP.Net MVC looks for a matching value for the "id" parameter, it will only look in the route parameters, and not look at the request parameters.

I found this surprising, to say the least.