Difference between MVC- ViewData and ViewBag?

public abstract class ControllerBase : IController

{

public dynamic ViewBag { get; }

public ViewDataDictionary ViewData { get; set; }

}

ViewBag:

viewBag is a dynamic Property which is used to pass data from view to controller.

Like

            ViewBag.FirstName = "kasibabu";

            ViewBag.LastName = "viswanath";

            ViewBag.Age = 26;

            ViewBag.Address = ViewBag.FirstName + ViewBag.LastName; // Dynamic Property

            ViewData["Age"] = ViewBag.Age;  // which is key/valued collection.

so we can access the Data from view at Runtime.

Like

        @ViewBag.Address---------à kasibabuviswanadh // Runtime passing data

        @ViewData["Age"]---------à key/ value based collection.

In ViewBag which create an anonymous type at runtime then pass data dynamically to view.

come to ViewData which holds data like a Session which stores data to based on key.

ViewData :


ViewData is of type ViewDataDictionary. which is also used to pass data from control to view

As well how to

        public ActionResult Index()

        {

            List<string> countries = new List<string>();

            countries.Add("India");

            countries.Add("Usa");

            countries.Add("UK");

ViewBag.Countries = countries;         //   ViewData["countries"] = countries;

            return View();

        }

<h6>

   <ol title="Some countries">

      @foreach (var item in ViewBag.Countries)

      {

         <li> @item</li>

      }

    </ol>

</h6>

 //   ViewData["countries"] = countries;

<ol title="Some countries">

      @foreach (var item in ViewData["countries"] as List<string>) //weak -typing

      {

         <li> @item</li>

      }

    </ol>

Yes the above ViewData way while converting we need to specify as strings.

So we can cay this is not a tightly coupled view.

as well as strongly typed view also is possible with the help of specified Model.

@model IEnumerable<FutureisMVC.Models.RegisterModel>

@model IEnumerable<FutureisMVC.Models.CarModel>

----ect.


which is preferable is based on scenerio :