File Upload not posting / MVC

Question

I'm trying to upload a file from my view to my controller, but the value is always null.

Controller:

public ActionResult Edit(AttachmentDto dto, HttpPostedFileBase UploadedFile)

Form Tag:

<form action="@Url.Action("Edit")" method="post" enctype="multipart/form-data">

Input Tag:

<input type="file" name="UploadedFile" id="File"  />

There are few other inputs being passed into the controller that the dto is receiving, however the UploadedFile is always null? Am I missing something here?

Your code as shown is working for me: https://i.stack.imgur.com/8Dtj1.png. Are you using AJAX or something to POST the form? — John H, Sep 23 '20 at 19:29
So using a button with type="submit" seems to cause some issue. When I switch to using just an as submit it works fine.. — ThePugh, Sep 23 '20 at 22:08
mmm, sensing something maybe with the view - can you post the full code? Also maybe, you need [HttpPost] on top of that Edit action. — Richard Housham, Oct 02 '20 at 09:50

score 0 · Accepted Answer · answered Oct 16 '20 at 21:45

So the mystery turned out to be a JavaScript import that was added to the project by a colleague to handle our form posts. There is already a question regarding posting multipart/formdata using jQuery here: Sending multipart/formdata with jQuery.ajax

Just added the FormData object and presto.

Thanks for all of your help!

File Upload not posting / MVC

1 Answers1