Given following ASP.NET MVC controller code:

    [HttpPost]
    public ActionResult Create(FormCollection collection)
    {
        string[] whitelist = new []{ "CompanyName", "Address1", "Address2", ... };
        Partner newPartner = new Partner();
        if (TryUpdateModel(newPartner, whitelist, collection))
        {                
            var db = new mainEntities();
            db.Partners.AddObject(newPartner);
            db.SaveChanges();
            return RedirectToAction("Details/" + newPartner.ID);
        }
        else
        {
            return View();
        }
    }

The problem is with the Entity Framework 4: the example Partner entity is mapped to a database table with it's fields NOT ALLOWED to be NULL (which is ok by design - they're required).

Unfortunately, invoking TryUpdateModel when some of the properties are nulls produces ConstraintException which is not expected! I do expect that TryUpdateModel return false in this case.

It is ok that EF wouldn't allow set a property value to null if it should not be, but the TryUpdateMethod should handle that, and add the error to ModelState errors collection.

I am wrong, or somebody screwed the implementation of TryUpdateModel method?