RedirectToAction with parameter

Question

I have an action I call from an anchor thusly, Site/Controller/Action/ID where ID is an int.

Later on I need to redirect to th

Answer 1

MVC 4 example...

Note that you do not always have to pass parameter named ID

var message = model.UserName + " - thanks for taking yourtime to register on our glorious site. ";
return RedirectToAction("ThankYou", "Account", new { whatever = message });

And,

public ActionResult ThankYou(string whatever) {
        ViewBag.message = whatever;
        return View();
} 

Of course you can assign string to model fields instead of using ViewBag if that is your preference.

Answer 2

The following succeeded with asp.net core 2.1. It may apply elsewhere. The dictionary ControllerBase.ControllerContext.RouteData.Values is directly accessible and writable from within the action method. Perhaps this is the ultimate destination of the data in the other solutions. It also shows where the default routing data comes from.

[Route("/to/{email?}")]
public IActionResult ToAction(string email)
{
    return View("To", email);
}
[Route("/from")]
public IActionResult FromAction()
{
    ControllerContext.RouteData.Values.Add("email", "mike@myemail.com");
    return RedirectToAction(nameof(ToAction));
         // will redirect to /to/mike@myemail.com
}
[Route("/FromAnother/{email?}")]`
public IActionResult FromAnotherAction(string email)
{
    return RedirectToAction(nameof(ToAction));
         // will redirect to /to/<whatever the email param says>
         // no need to specify the route part explicitly
}