CODEWITHSUNDEEP
c#asp.net-mvc-3
Khelvaster
Khelvaster

Reputation: 872

Hidden field doesn't POST along with file

I have the following MVC form and controller to upload an image for merchandise with a given id. The id is null when this form is submitted to the controller for some reason. I checked in the rendered HTML and the correct ID is being rendered on the webpage.

The form:

@using(Html.BeginForm(new{id = ViewBag.id})){

<input type="hidden" name="id" id="id" value="@ViewBag.Id"/>

<label for="file">Filename:</label>
<input type="file" name="file" id="file" />
<input type="submit" />
}

And the controller:

[HttpPost]
public ActionResult AddImage(int merchandiseId, HttpPostedFileBase image)
<snip>

Why would submitting this form cause merchandiseId to be null?

Upvotes: 1

Views: 1484

Answers (3)

Kundan Singh Chouhan
Kundan Singh Chouhan

Reputation: 14292

Change the Html.BeginForm like below :

@using(Html.BeginForm(new{merchandiseId = ViewBag.id}))

This will fix your problem.

Upvotes: 0

samjudson
samjudson

Reputation: 56853

merchandiseId would be 0 (and not null) because there is no input on your form called merchandiseId.

<input type="hidden" name="merchandiseId" id="merchandiseId" value="@ViewBag.Id"/>

Upvotes: 1

Mateusz Rogulski
Mateusz Rogulski

Reputation: 7445

Becouse you use wrong names. Change

<input type="hidden" name="id" id="id" value="@ViewBag.Id"/>

to

<input type="hidden" name="merchandiseId" id="id" value="@ViewBag.Id"/>

or

public ActionResult AddImage(int merchandiseId, HttpPostedFileBase image)

to

public ActionResult AddImage(int id, HttpPostedFileBase image)

Upvotes: 3

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