Modified ModelState to only ever be created on the ActionContext and then plumbed/exposed it on ViewData and Controller. This will enable: ActionFilterContext's will have access to ModelState via its ActionContext member, allow HTMLHelpers to access ModelState via ViewData, and unify the locations of "source" model state. In the old world we used to copy/replace/instantiate new model state all over unnecessarily.
This follows a similar pattern to html helpers - a minimal basis interface
that performs the main functionality, and a set of extension methods that
make up the rich API.
dougbu
Ryan Nowak
Andrew Peters
Yishai Galatzer
N. Taylor Mullen