Passing Information Between Controllers in ASP.Net-MVC

Question

This is a duplicate of How to RedirectToAction in ASP.NET MVC without losing request data

Hi, I have come into a problem which is making me scratch my head a little bit. Basically I have a login page Login.aspx , which has username and password fields, as well as an important little checkbox. The login is handled in the AccountController Login method. The code currently is as follows:

[AcceptVerbs(HttpVerbs.Post)]
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings",
    Justification = 
        "Needs to take same parameter type as Controller.Redirect()")]
public ActionResult LogOn(string userName, string password, string returnUrl, 
    bool sendStoredInfo)
{
    if (!this.ValidateLogOn(userName, password)) {
        return View();
    }

    this.FormsAuth.SignIn(userName, false);

    if (!String.IsNullOrEmpty(returnUrl)) {
        return Redirect(returnUrl);
    } else {
        return RedirectToAction("Index", "Home");
    }
}

Basically, if the line return Redirect(returnUrl); fires, then it will end up in another controller, the OpenIDController, and it is that situation where the sendStoredInfo bool becomes important. But the problem is I have no reference to it when I'm in the OpenIDController. How can I send this value across?

Neil T. · Accepted Answer · 2010-02-15 22:34:51Z

14

Change the call to:

return RedirectToAction("LoginFailed", new { sendFlag = sendStoredInfo });

The controller action method signature could be something like:

public ActionResult LoginFailed(bool sendFlag)
{
    ...
}

answered Feb 15, 2010 at 22:34

Neil T.

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Philip Wardlaw · Accepted Answer · 2015-02-10 22:32:11Z

14

Also consider using TempData to pass data from controller to controller. This can be advantageous as you wont have to expose the bool sendFlag interface potentially to the user.

Code in the first controller:

TempData["sendFlag"] = sendStoredInfo;
return RedirectToAction("LoginFailed");

Code in the second controller:

public ActionResult LoginFailed()
{
   bool sendFlag = TempData.ContainsKey("sendFlag")? TempData["sendFlag"]: false;
}

edited Feb 10, 2015 at 22:32

answered Feb 10, 2015 at 18:30

Philip Wardlaw

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2 Comments

Philip Wardlaw Over a year ago

Thanks Jace Rhea, I've made the suggested changes.

Umit Kaya Over a year ago

why this bool sendFlag = TempData.ContainsKey("sendFlag")? TempData["sendFlag"]: false; will throw an exception saying "object null reference"?

Community · Accepted Answer · 2017-05-23 12:10:27Z

1

Because of the nature of redirects, you can only perform a GET operation.

This means that you have to pass the parameter as part of the query string.

So you would redirect to a url like http://host/dir/page?sendStoredInfo=true

Then, you can chose to have it part of your method signature in the other controller, or, you can choose to access it directly using the HttpRequest exposed by the HttpContext for the operation.

You can also call the RedirectToAction, as per this previous question:

How to RedirectToAction in ASP.NET MVC without losing request data

edited May 23, 2017 at 12:10

CommunityBot

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answered Feb 15, 2010 at 22:29

casperOne

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Comments

Ali · Accepted Answer · 2015-02-10 18:59:23Z

1

As far as my knowledge serves me well, four different methods exist to handle passing data between controllers in asp.net MVC. They are 1. ViewData 2. ViewBag 3. TempData and 4. Sessions. If you may like a relatively good explanation besides a downloadable sample, please take a look at here

answered Feb 10, 2015 at 18:59

Ali

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