How do I repopulate the view model in ASP.NET MVC 2 after a validation error?
- by Keltex
I'm using ASP.NET MVC 2 and here's the issue. My View Model looks something like this. It includes some fields which are edited by the user and others which are used for display purposes. Here's a simple version
public class MyModel
{
public decimal Price { get; set; } // for view purpose only
[Required(ErrorMessage="Name Required")]
public string Name { get; set; }
}
The controller looks something like this:
public ActionResult Start(MyModel rec)
{
if (ModelState.IsValid)
{
Repository.SaveModel(rec);
return RedirectToAction("NextPage");
}
else
{
// validation error
return View(rec);
}
}
The issue is when there's a validation error and I call View(rec), I'm not sure the best way to populate my view model with the values that are displayed only.
The old way of doing it, where I pass in a form collection, I would do something like this:
public ActionResult Start(FormCollection collection)
{
var rec = Repository.LoadModel();
UpdateModel(rec);
if (ModelState.IsValid)
{
Repository.SaveModel(rec);
return RedirectToAction("NextPage");
}
else
{
// validation error
return View(rec);
}
}
But doing this, I get an error on UpdateModel(rec): The model of type 'MyModel' could not be updated.
Any ideas?
