I'm not sure if you're familiar with the ASP MVC framework, but I am trying to implement Uploadifive 1.0. When in debugger mode, I know that the upload action is successfully passed to the Controller and the Server variables are passed as well. However, the HttpPostedFileBase variable fileData is always null. I've looked everywhere on google and couldn't find an answer. I found out that the variable has to be called fileData. That doesn't help though.

I checked all the request variables and what seems strange to me is that the content length in bytes is also correct of the upload file. But there are no attached files. The custom headers HTTP_X_... come through as well.

Here's part of the view:

<form action="<%: Url.Action("SaveFiles", "File") %>" enctype="multipart/form-data">
<input type="file" name="file_upload" id="file_upload" />
</form>

<script type="text/javascript">
(function ($) {
$(document).ready(function () {
$('#file_upload').uploadifive({
'method': 'post',
'uploadScript': 'SaveFiles',
'formData': {'path' : 'documents'}
});
});
})(jQuery);
</script>

Here's the controller action:

[HttpPost]
public ActionResult SaveFiles(HttpPostedFileBase fileData)
{
string uploadFolder = Request.ServerVariables.Get("HTTP_X_PATH");
if(string.IsNullOrWhiteSpace(uploadFolder))
return Json(JsonMessageManager.GetFailureMessage("No upload folder was selected"));

if (fileData != null && fileData.ContentLength > 0)
{
var fileName = Path.GetFileName(fileData.FileName);
var path = Path.Combine(Server.MapPath("~/Content/" + uploadFolder), fileName);
fileData.SaveAs(path);
return Json(true);
}
return Json(false);
}

Not sure where the problem is. I've looked at other implementations using the MVC framework and I am doing exactly what they do and they seem to get it working.