Using a query string with an form in MVC3

Question

I have an MVC3 view with a form and i want to pass in a parameter via query string. Heres my form

@using (Html.BeginForm("LogOn", "Account", new { db = @Request.QueryString["db"] }, FormMethod.Post))

Heres my Controller

[HttpPost]
public ActionResult LogOn(LogOnModel model,string db)

When I click my Login button, and step through the code, the param db is null. Im passing it in like this:

  http://localhost:64632/?db=someValue

My route looks like this:

routes.MapRoute(
    "Default", // Route name
    "{controller}/{action}/{db}", // URL with parameters
        new { controller = "Account", action = "LogOn", db = UrlParameter.Optional           } // Parameter defaults
);

What am i doing wrong?

Why can't you just put db as a property in your Model, set it on load of that page (it must be set in the query string somewhere), then put it in a hidden field, that way when you submit the form you have the value. Default MVC model binding FTW :) — Mathew Thompson
– Mathew Thompson, Commented May 23, 2012 at 20:44
This is a business requirement. The current app accepts db as a query string parameter and the client doesnt want to change that — BoundForGlory
– BoundForGlory, Commented May 23, 2012 at 20:45
I was wondering if we could use @Request.QueryString["db"] in the view. Did you check whether that value was set correctly? — Jin-Wook Chung
– Jin-Wook Chung, Commented May 23, 2012 at 20:59
Hmmm.... interesting; however for me I am not able to recreate the issue. Your code works 100% fine. BTW what about your model; does it have values? — Prashanth Thurairatnam
– Prashanth Thurairatnam, Commented May 23, 2012 at 22:38

web_bod · Accepted Answer · 2012-05-23 20:46:48Z

1

Your route is expecting db to be a token in the url:

http://localhost:64632/Account/LogOn/someValue

You could grab the value from the querystring in your controller and store the db parameter in a ViewBag and it will be available on your form.

answered May 23, 2012 at 20:46

web_bod

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1 Comment

BoundForGlory Over a year ago

I wish i could, but this is a business requirement. Plus i thought with MVC, a query string is the same as what you described

DMulligan · Accepted Answer · 2012-05-23 21:28:05Z

1

If that's the only route you have, then presumably the page you're currently on looks like "/controller/action/dbValue". In this case,

@Request.QueryString["db"]

won't fetch anything because db is a route value, it's not part of the query string. You could use

@ViewContext.RouteData.Values["db"]

instead.

answered May 23, 2012 at 21:28

DMulligan

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Chuck Conway · Accepted Answer · 2012-05-23 22:23:02Z

1

It works. I am doing the same thing. I can retrieve the query string values on a http post: Request["queryparametername"]

answered May 23, 2012 at 22:23

Chuck Conway

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Andrei Neagu · Accepted Answer · 2012-05-23 20:51:00Z

0

well, this is a get method link : "http://localhost:64632/?db=someValue"

and you used the HttpPost attribute.

answered May 23, 2012 at 20:51

Andrei Neagu

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1 Comment

DMulligan Over a year ago

Methods using the HttpPost attribute can still receive parameters from a query string.

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