Question

I have a base Controller like follow

 public abstract class BaseController
    {

        protected ActionResult LogOn(LogOnViewModel viewModel)
        {
            SaveTestCookie();

            var returnUrl = "";
            if (HttpContext != null && HttpContext.Request != null && HttpContext.Request.UrlReferrer != null)
            {
                returnUrl = HttpContext.Request.UrlReferrer.LocalPath;
            }

            TempData["LogOnViewModel"] = viewModel;


            return RedirectToAction("ProceedLogOn", new { returnUrl });
        }

        public ActionResult ProceedLogOn(string returnUrl)
        {
            if (CookiesEnabled() == false)
            {
                return RedirectToAction("logon", "Account", new { area = "", returnUrl, actionType, cookiesEnabled = false });
            }
            var viewModel = TempData["LogOnViewModel"] as LogOnViewModel;

            if (viewModel == null)
            {
                throw new NullReferenceException("LogOnViewModel is not found in tempdata");
            }

            //Do something
            //the problem is I missed the values which are set in the ViewBag
        }
    }

and another Controller

public class MyController : BaseController
    {

        [HttpPost]
        public ActionResult LogOn(LogOnViewModel viewModel)
        {
            // base.LogOn is used in differnet controller so I saved some details in view bag 

            ViewBag.Action = "LogonFromToolbar";
            ViewBag.ExtraData = "extra data related only for this action";

            return base.LogOn(viewModel);
        }

    }

the problem is I missed the view bag values in ProceedLogOn action method.
I have the values in Logon method in BaseController.

How can I copy the values of ViewBag from one Action to another Action?

So I can not simply say this.ViewBag=ViewBag;

because ViewBag doesn’t have setter. I was thinking of Iterating through viewbag.
I tried ViewBag.GetType().GetFields() and ViewBag.GetType().GetProperties() but they return nothing.

Answer 1

ViewData reflects ViewBag
You can iterate the values you’ve stored like this :

ViewBag.Message = "Welcome to ASP.NET MVC!";
ViewBag.Answer = 42;

foreach (KeyValuePair<string, object> item in ViewData)
{
    // if (item.Key = "Answer") ...
}

This link should also be useful