MVC Passing ViewBag value from another controller

问题

I've set a value into Viewbag.message in my default HomeController and successfully display it in my Shared/_Layout.cshtml.

After that I added another TestController and in the TestController view, Viewbag.message seems to be null. May I know what's wrong with it.

Correct me if I'm wrong,from my understanding Viewbag.Message should be available from all over the places?

回答1:

ViewBag is a dynamic property that takes advantage of the new dynamic features in C# 4.0. Basically it is a wrapper around the ViewData and also used to pass data from controller to corresponding view.

It’s life also lies only during the current request. If redirection occurs then it’s value becomes null.
It doesn’t required typecasting for complex data type.

Below is a summary table which shows different mechanism of persistence.

Credit:CodeProjectArticle

回答2:

[HttpPost]
public ActionResult Index()
{
    TempData["Message"] = "Success";
    return RedirectToAction("Index");
}


public ActionResult Index()
{
    ViewBag.Message=TempData["Message"];
    return View();
}

回答3:

//one controller to another controller you need to use seesion 
//this is Home controller

[httpPost]
public actionresult Index()
{
    session["Message"] = "Welcome to session tutorial";
    return redirectToAction("Index","About");
}

//now pass to the another About controller

[httpPost]
public actionresult About()
{
    viewbag. message = session["Message"]
    return view();
}

来源：https://stackoverflow.com/questions/18479297/mvc-passing-viewbag-value-from-another-controller

标签

asp.net-mvc

asp.net-mvc-4

viewbag