ASP.Net MVC file upload

How to upload file or image in asp.net mvc is not difficult but is totally different compare to asp.net FileUpload control. If we are asp.net developer and we are new to mvc then we immediately noticed we don’t have server side controls so the FileUpload control as well and our problem start here. Now we start searching how to upload a file if there is no FileUpload control, no problem whatever your background is, in this article we will see how to upload a file in mvc without using FileUpload control.

When we use FileUpload control in asp.net web forms it renders htpm input control, here is the rendered HTML for FileUpload control

 <input id="FileUpload1" type="file" name="FileUpload1">

Now we will see the HTML needed to upload a file in mvc, first normal HTML and then razor one

<form action="/UploadPhoto" enctype="multipart/form-data" method="post"> 
    <input id="file" type="file" name="file" style="font-size:14px;" /> 
    <input type="submit" value="Upload" class="btn" />
    <div class="err" style="padding-top:7px;"> 
        @ViewBag.error
    </div>
</form>

OR razor

@using (Html.BeginForm("UploadPhoto", "Home", FormMethod.Post, 
                                       new { enctype = "multipart/form-data" }))
{
    <input id="file" type="file" name="file" style="font-size:14px;" />
    <input type="submit" value="Upload" class="btn" />  
    <div class="err" style="padding-top:7px;"> 
        @ViewBag.error
    </div>      
}

We completed our HTML part and here is the output

So far so good, our design is working as we want, now time to write the controller and business logic to save the file

Here is the home controller code:

[HttpGet]
public ActionResult UploadPhoto()
{
     return View();
}

[HttpPost]
public ActionResult ChangePhoto(HttpPostedFileBase file)
{
  if (file != null && file.ContentLength > 0)
  {
     String FileExtn = System.IO.Path.GetExtension(file.FileName).ToLower();
     if (!(FileExtn == ".jpg" || FileExtn == ".png" || FileExtn == ".gif"))
     {
         ViewBag.error = "Only jpg, gif and png files are allowed!";
     }
     else
     {
       // add name space System.Drawing
       using (Image Img = Image.FromStream(file.InputStream))
       {
          String imgPath = String.Format("UserImages/{0}{1}", Img.FileName, FileExtn);
          Img.Save(String.Format("{0}{1}", Server.MapPath("~"), imgPath), Img.RawFormat);
          // you can add code here to save information to database.
          return View();
        }
     }
    return View();
}

That's all we need to upload a file in mvc, if you want to resize the image and upload in different sizes then see Hamden's article Upload multiple image in multiple size with progress bar in asp.net specially NewImageSize method, I used this and it works well. In my next post I will write about hot to upload multiple files in mvc, hope it will come soon.

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