Use coventional routes for link generation
This change enables using conventional routes for link generation when
using MVC conventional routes. This change makes MVC link generation
behaviour highly compatible with 2.1.
The way that this works is that we create endpoints for **MATCHING**
using the denormalized conventional route, but we tell those endpoints
to suppress link generation.
For link generation we generate a non-matching endpoints per-route with
the same order value.
I added the concept of *required value any* to link generation. This is
needed because for an endpoint to participate in link generation using
RouteValuesAddress it needs to have some required values. These details
are a little fiddly, but I think it's worth doing this feature
completely.
This change introduces some new heuristics to make it easier to use
'page' or other resevered parameter names as parameters in URL
generation.
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The main change here is to allow the link generation tree to *ignore* a
value passed in to URL generation when it conflicts with an endpoint's
required values.
The main concern of this feature area is "how do we tell whether you are
linking to an action or a page?". Routing attempts to do the right thing
will requiring very little from the user in terms of expressing intent.
In this case, we try to tell the difference between an attempt to generate
a link to an action due to the presence of the 'action' parameter and
absence of the 'page' parameter. This obviously doesn't work when you
want to use 'page' as a non-reserved parameter in an action. The same
case occurs for pages, but users are already used to the idea that
'action' is a reserved word in MVC.
We can loosen this restriction when the value that's supplied for 'page'
is known not to be any existing value of the 'page' route value.
This approach seems somewhat reasonable but has many of the problems inherent
to this area. When it fails (the value you want to use for 'page' causes
a conflict) - it's going to be esoteric and hard to understand.
Ryan Nowak
Ajay Bhargav Baaskaran