How do I maintain ModelState errors when using RedirectToAction?

Question

I have some code that saves a ticket in our system. If there is an error it does a RedirectToAction. The problem is that I don\'t seem to have my errors in the new action.

Answer 1

I know this thread is old, but this blog about ASP.NET Best Practices has some excellent suggestions.
#13 on the page deals with using 2 Action filters to save and restore ModelState between redirects.

This is the pattern that my work uses, and I love it.

Here's the simplified example:

[ImportModelStateFromTempData]
public ActionResult Dashboard()
{
    return View();
}

[AcceptVerbs(HttpVerbs.Post), ExportModelStateToTempData]
public ActionResult Dashboard(string data)
{
    if (ValidateData(data))
    {
        try
        {
            _service.Submit(data);
        }
        catch (Exception e)
        {
            ModelState.AddModelError(ModelStateException, e);
        }
    }

    return RedirectToAction("Dashboard");
}