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PartialViews And Validation (Postback)

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :ASP.Net

The title might not be so clear (because I couldn't find a better one) but what I'm trying to figure out is when you have a normal (as opposed to partial) view, usually there's a GET action method which simply renders the view with a new instance of the view model, and a POST action method (usually with the same name) that accepts an instance of the view model as a parameter. Inside the POST action method, you check the ModelState if it's valid you do what you're supposed to do, if not you render the view again with the same view model instance in order to display any errors.

That's actually one of the things I really like about ASP.NET MVC, but how does that work with Partial Views? If I render back a partial view with the instance of the view model, it only displays the partial view with a white background, out of the context of the whole web application. And if I post back a normal View passing the instance of the view model, that causes a StackOverflowException.

Here's an example:

        public ActionResult Login(LoginViewModel dto)
            bool flag = false;
            if (ModelState.IsValid)
                if (_userService.AuthenticateUser(dto.Email, dto.Password, false))
                    var user = _userService.GetUserByEmail(dto.Email);


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