Propagating QueryString parameter in RedirectToAction calls

Question

I want to make sure that a particular parameter in the QueryString, in my case the request_id is propagated to the redirected action.

Say for example, I have an Action First,

[HttpPost]
public ActionResult First() 
{
    ////////////////////
    // Lots of code ...
    ////////////////////

    return RedirectToAction("Second");
}

Now say, the First postback had a parameter in the QueryString, which I would like to pass to the Second action. One way to do it would be to pass the value in the RedirectToAction call itself,

string requestId = Request.QueryString[REQUEST_ID_KEY];
return RedirectToAction("Second", new { REQUEST_ID_KEY = requestId });

But I have to do this in a series of Actions and I am unwilling to incorporate request id propagation logic inside the action. It would be better if I could incorporate this inside an ActionFilter, but I cant figure out how to add parameters to the QueryString from an ActionFilter. Any ideas?

Darin Dimitrov · Accepted Answer · 2012-03-27 06:06:01Z

53

public class PreserveQueryStringAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        var redirectResult = filterContext.Result as RedirectToRouteResult;
        if (redirectResult == null)
        {
            return;
        }

        var query = filterContext.HttpContext.Request.QueryString;
        // Remark: here you could decide if you want to propagate all
        // query string values or a particular one. In my example I am
        // propagating all query string values that are not already part of
        // the route values
        foreach (string key in query.Keys)
        {
            if (!redirectResult.RouteValues.ContainsKey(key))
            {
                redirectResult.RouteValues.Add(key, query[key]);
            }
        }
    }
}

and then:

[HttpPost]
[PreserveQueryString]
public ActionResult First() 
{
    ////////////////////
    // Lots of code ...
    ////////////////////

    return RedirectToAction("Second");
}

answered Mar 27, 2012 at 6:06

Darin Dimitrov

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8 Comments

alok_dida Over a year ago

@Darin .. Just for the knowledge.. May I know what is the advantage of this implementation over Session or TempData?

Darin Dimitrov Over a year ago

@alok_dida, TempData uses Session behind the scenes. Personally I never use Session in my applications. I prefer designing them in a stateless and RESTful manner. So since I disable the session in web.config (<sessionState mode="Off" />), well, Session and TempData don't apply for me.

alok_dida Over a year ago

@Darin .. Oks. One more question(I hope you don't get irritate with my bunch of questions), I am implementing one application which uses form authentication. I want to keep the logged in user's "UserID" through out the application. How can I implement this scenario without using Session? I am using MVC 3.

Darin Dimitrov Over a year ago

@alok_dida, that's already implemented for you by the Forms Authentication module. The currently logged in user is stored in a cookie and you can retrieve it in every action using the User.Identity.Name property. You don't really need to do anything in order to achieve that.

irriss Over a year ago

In .netcore you will use Request.Query instead of Request.QueryString. Hope it helps someone

|

alok_dida · Accepted Answer · 2012-03-27 05:13:22Z

0

If you need it in subsequent action than please add it that param in Session or TempData (But need to re-assign in each action) so you dont need to pass it as a querystring in each action. In case of session, once you done with all actions than remove that key from the Session.

answered Mar 27, 2012 at 5:13

alok_dida

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2 Comments

Arnab Chakraborty Over a year ago

I will need the data in the postback too .. so I have to pass it in the QueryString

alok_dida Over a year ago

You will easily get the data from Session till you dont remove the key from the session so that data will be available in postback action too.

UBCoder · Accepted Answer · 2012-07-19 14:25:29Z

0

Here is a blogpost I wrote on how to fluently add querystring parameters in the action

answered Jul 19, 2012 at 14:25

UBCoder

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