Exception calling UpdateModel - Value cannot be null or empty
- by James Alexander
This is probably something silly I'm missing but I'm definitely lost. I'm using .NET 4 RC and VS 2010. This is also my first attempt to use UpdateModel in .NET 4, but every time I call it, I get an exception saying Value cannont be null or empty. I've got a simple ViewModel called LogOnModel:
[MetadataType(typeof(LogOnModelMD))]
public class LogOnModel
{
public string Username { get; set; }
public string Password { get; set; }
public class LogOnModelMD
{
[StringLength(3), Required]
public object Username { get; set; }
[StringLength(3), Required]
public object Password { get; set; }
}
}
My view uses the new strongly typed helpers in MVC2 to generate a textbox for username and one for the password. When I look at FormCollection in my controller method, I see values for both coming through.
And last but not least, here's are post controller methods:
// POST: /LogOn/
[HttpPost]
public ActionResult Index(FormCollection form)
{
var lm = new LogOnModel();
UpdateModel(lm, form);
var aservice = new AuthenticationService();
if (!aservice.AuthenticateLocal(lm.Username, lm.Password))
{
ModelState.AddModelError("User", "The username or password submitted is invalid, please try again.");
return View(lm);
}
return Redirect("~/Home");
}
Can someone please lend some insight into why UpdateModel would be throwing this exception? Thanks!
