Simple file upload returns NULL?

Question

I\'m trying to do my first simple file upload in MVC 5. I\'m following a bunch of examples I\'ve found but for some reason in my \"Create\" ActionResult the uploadFile is always

Answer 1

Your file input element's name should match to your action method parameter name.

So update your HTML markup to have the same name attribute value.

<input type="file" name="uploadFile" value="" multiple="multiple" />

and your action method will be

[HttpPost]
public ActionResult Create(HttpPostedFileBase uploadFile)
{
  // do something
}

Or change your action method parameter name to match with your file input element name.

<input type="file" name="files" value="" multiple="multiple" />

and your action method will be

[HttpPost]
public ActionResult Create(HttpPostedFileBase files)
{
    if(files!= null && files.ContentLength > 0)
    {
       // do something
    }
}

When you add multiple="multiple" attribute to the input element, the browser will allow the end user to select more than one file at a time. In that case If your action method parameter is a single instance of HttpPostedFileBase object, It will receive the first file from the selected n files. If you want all the files, You may change your parameter to a collection such as

[HttpPost]
public ActionResult Create(IEnumerable<HttpPostedFileBase> files)
{
    if (files != null && files.Any())
    {
        foreach (var file in files)
        {
            if (file.ContentLength > 0)
            {
                //do something
            }
        }
    }
}