Question

Using ASP.NET MVC there are situations (such as form submission) that may require a RedirectToAction.

One such situation is when you encounter validation errors after a form submission and need to redirect back to the form, but would like the URL to reflect the URL of the form, not the action page it submits to.

As I require the form to contain the originally POSTed data, for user convenience, as well as validation purposes, how can I pass the data through the RedirectToAction()? If I use the viewData parameter, my POST parameters will be changed to GET parameters.

Answer 1

The solution is to use the TempData property to store the desired Request components.

For instance:

public ActionResult Send() {     TempData['form'] = Request.Form;     return this.RedirectToAction(a => a.Form()); } 

Then in your ‘Form’ action you can go:

public ActionResult Form() {     /* Declare viewData etc. */      if (TempData['form'] != null)     {         /* Cast TempData['form'] to          System.Collections.Specialized.NameValueCollection          and use it */     }      return View('Form', viewData); }