Null Exception in File Uploading in MVC4 Razor

Question

I have created the following view, with having file upload and submit button.

@using (Html.BeginForm("FileUpload", "Home",
                    FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input name="uploadFile" type="file" />
    <input type="submit" value="Upload File" id="btnSubmit" />
}

I have also created the action method in Controller but it gives the null at the "uploadFile"

[HttpPost)]
        public ActionResult FileUpload(HttpPostedFileBase uploadFile)
        {
            if (uploadFile.ContentLength > 0)
            {
                string filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads"),
                                               Path.GetFileName(uploadFile.FileName));
                uploadFile.SaveAs(filePath);
            }
            return View();
        }

Have you confirmed that `uploadFile` isn't null when the method is called? — M.Babcock, Sep 26 '13 at 04:35
yes. uploadFile has file at the time when method was called. — Bhupendra Shukla, Sep 26 '13 at 04:40
Can you just humour me and put an identical `id` attribute on the upload? E.g: ``? — Simon Whitehead, Sep 26 '13 at 04:47
Can you debug and check `Request.Files` actually has entries? If it doesn't.. your problem is somewhere else. — Simon Whitehead, Sep 26 '13 at 05:01
Where I found the Request.Files. I have not use this in my code — Bhupendra Shukla, Sep 26 '13 at 05:04
@BhupendraShukla [See the answer below](http://stackoverflow.com/questions/19019345/null-exception-in-file-uploading-in-mvc4-razor/19019855#19019855) — RajeshKdev, Sep 26 '13 at 05:17
@BhupendraShukla Are you sure your form is getting submitted? without any server exceptions? — RajeshKdev, Sep 26 '13 at 05:19

score 2 · Accepted Answer · edited May 23 '17 at 11:56

2

Can u try Name with same as uploadFile

In your Page:

@using (Html.BeginForm("FileUpload", "Home",
                    FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input id="uploadFile" name="uploadFile" type="file" />
    <input type="submit" value="Upload File" id="btnSubmit" />
}

As per @Willian Duarte comment : [HttpPost]

In your Code behind:

[HttpPost]
public ActionResult FileUpload(HttpPostedFileBase uploadFile) // OR IEnumerable<HttpPostedFileBase> uploadFile
{
    //For checking purpose 
     HttpPostedFileBase File = Request.Files["uploadFile"];

    if (File != null)
    {
        //If this is True, then its Working.,
    }

    if (uploadFile.ContentLength > 0)
    {
        string filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads"),
                                       Path.GetFileName(uploadFile.FileName));
        uploadFile.SaveAs(filePath);
    }
    return View();
}

See here Same question like yours.,

Code project Article about the File upload.,

edited May 23 '17 at 11:56

Community

1
1

answered Sep 26 '13 at 05:11

RajeshKdev

6,365
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@BhupendraShukla [Lets continue our discussion here](http://chat.stackoverflow.com/rooms/28436/c-developers) – RajeshKdev Sep 26 '13 at 05:20
have you tried instead of `HttpPostedFileBase uploadFile` to `IEnumerable uploadFile` as i mentioned in my answer? – RajeshKdev Sep 26 '13 at 05:23
Thanks for the help. Actually there is also no problem in my code, the error is produced due to wrong reference of Helper method i created earlier. Now my code is also running fine. – Bhupendra Shukla Sep 26 '13 at 06:06
Setting the id and name worked for me. Only setting the id did not work for me. – James K Nov 17 '13 at 15:59
@Wonderboy The `file control name` should be same as `HttpPostedFileBase` parameter name in Controller Action Result. It will work like View Model Concept. Ex : Creating property for the control and getting the value in Controller from View. – RajeshKdev Nov 18 '13 at 11:01
@Wonderboy set the name and check it will work., :) I have edited my answer., Hope it helps – RajeshKdev Nov 18 '13 at 11:01

Sunny Sharma · Answer 2 · 2013-09-26T05:46:42.133

1

create a model and bind it to your view that controller will also expect:

Controller:

    //Model (for instance I've created it inside controller, you can place it in model
    public class uploadFile
    {
        public HttpPostedFileBase file{ get; set; }
    }

    //Action
    public ActionResult Index(uploadFile uploadFile)
    {
        if (uploadFile.file.ContentLength > 0)
        {
            string filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads"),
                                           Path.GetFileName(uploadFile.file.FileName));
            uploadFile.file.SaveAs(filePath);
        }
        return View();
    }

View @model sampleMVCApp.Controllers.HomeController.uploadFile

@using (Html.BeginForm("FileUpload", "Home",
                FormMethod.Post, new { enctype = "multipart/form-data" }))
{
  @Html.TextBoxFor(m => m.file, new { type = "file"});  
 <input type="submit" value="Upload File" id="btnSubmit" />
}

Tested Solution!

HTH :)

edited Sep 26 '13 at 05:46

answered Sep 26 '13 at 04:46

Sunny Sharma

4,688
5
35
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Why would you suggest going backwards? This is 2013.. we don't need to access a `FormCollection`.. – Simon Whitehead Sep 26 '13 at 04:48
@SimonWhitehead: thanks for the suggestion, edited my answer, now it should work :) – Sunny Sharma Sep 26 '13 at 04:57
@BhupendraShukla: check my answer now, tested. – Sunny Sharma Sep 26 '13 at 05:48
plz mark it as answer then, so that other would get it in one go. – Sunny Sharma Sep 26 '13 at 07:36

score 1 · Answer 3 · answered Sep 26 '13 at 05:05

1

Try to use (on controller):

var file = System.Web.HttpContext.Current.Request.Files[0];

answered Sep 26 '13 at 05:05

Willian Andrade

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3
11

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For asp.net mvc 4 you can use [HttpGet] and [HttpPost] instead [AcceptVerbs..] – Willian Andrade Sep 26 '13 at 05:08
I tried both [HttpPost] and [AcceptVerbs(HttpVerbs.Post)] but i think that is not an issue. Currently using [HttpPost]. I tried your code but it is working. – Bhupendra Shukla Sep 26 '13 at 05:15

score 1 · Answer 4 · answered Oct 15 '13 at 09:25

1

Use the following in the controller:

var file = System.Web.HttpContext.Current.Request.Files[0];

Use HttpPost instead of [AcceptVerbs(HttpVerbs.Post)]

answered Oct 15 '13 at 09:25

Null Exception in File Uploading in MVC4 Razor

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