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I'm posting a simple text file to an asp.net MVC app. When I post using the form below, the form parameter is not null. But file is. Any ideas what I'm doing wrong?

<form method=post action="http://localhost/Home/ProcessIt" enctype="application/x-www-form-urlencoded"> <input type=file id="thefile" name="thefile" /> <input type="submit" name="Submit" /> </form>

In the asp.net mvc app:

[HttpPost] public ActionResult ProcessIt(FormCollection thefile) { HttpPostedFileBase file = Request.Files["thefile"]; ... }
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    stackoverflow.com/questions/5193842/file-upload-asp-net-mvc-3-0/… Commented Nov 27, 2013 at 4:05
  • If I use HttpPostedFileBase, the parameter will be null. Commented Nov 27, 2013 at 4:32
  • use the same name for your input element and method parameter. Follow the link i posted Commented Nov 27, 2013 at 4:37
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    I've updated the post. I am using the same ID/Name for the input element and method parameter. Still no file. Commented Nov 27, 2013 at 4:48
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    Got it working with FormCollection. IE was caching my form fields. Once I refreshed, it began working. Commented Nov 27, 2013 at 4:55

2 Answers 2

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This works for me:

View:

@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" })) { <input type="file" name="file" /> <input type="submit" value="OK" /> }

Controller:

[HttpPost] public ActionResult Index(HttpPostedFileBase file) { // Verify that the user selected a file if (file != null && file.ContentLength > 0) { // extract only the fielname var fileName = Path.GetFileName(file.FileName); // then save on the server... var path = Path.Combine(Server.MapPath("~/uploads"), fileName); file.SaveAs(path); } // redirect back to the index action to show the form once again return RedirectToAction("Index"); }
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Instead of copying and pasting solutions as your own you should really point to the original. stackoverflow.com/a/5193851/1759873
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Need to change the enctype to multipart/form-data: http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2

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file is still null. There isn't anything in the Request.Files collection.

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