Uploading a File (Or Files) With ASP.NET MVC

I wanted to confirm something about how to upload a file or set of files with ASP.NET MVC and the first search result for the phrase “uploading a file with asp.net mvc” is Scott Hanselman’s blog post on the topic.
His blog post is very thorough and helps provide a great understanding of what’s happening under the hood. The only complaint I have is that the code could be much simpler since we’ve made improvements to the ASP.NET MVC 2. I write this blog post in the quixotic hopes of knocking his post from the #1 spot.
Uploading a single file
Let’s start with the view. Here’s a form that will post back to the current action.

<form action="" method="post" enctype="multipart/form-data">
 
 <label for="file">Filename:</label>
 <input type="file" name="file" id="file" />

 <input type="submit" />
</form>

Here’s the action method that this view will post to which saves the file into a directory in the App_Data folder named “uploads”.

[HttpPost]
public ActionResult Index(HttpPostedFileBase file) {
           
 if (file.ContentLength > 0) {
   var fileName = Path.GetFileName(file.FileName);
   var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
   file.SaveAs(path);
 }
           
 return RedirectToAction("Index");
}

Notice that the argument to the action method is an instance of HttpPostedFileBase. ASP.NET MVC 2 introduces a new value providers feature which I’ve covered before.
Whereas model binders are used to bind incoming data to an object model, value providers provide an abstraction for the incoming data itself.

Read more: Haacked

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