ASP.Net MVC File Upload Question

Question

When I want to try the file upload in ASP.Net MVC,I am receive the following error.

Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current 
web request. Please review the stack trace for more information about the error 
and     where    it originated in the code. 

Exception Details: System.NullReferenceException: Object reference 
not set to an instance of an object.

Source Error: 
Line 21:         public ActionResult FileUpload(HttpPostedFileBase uploadFile)
Line 22:         {
Line 23:            if (uploadFile.ContentLength > 0)
Line 24:            {
Line 25:              string filePath =  Path.Combine(HttpContext.Server.MapPath
("../../Tarifler/Videolar/"),
Source File: D:\yemekizle\yemekizle\Controllers\FileUploadController.cs  Line: 23

Here is my code line.

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> 

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">     
    FileUpload
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">  
    <h2>FileUpload</h2>        
    <% using (Html.BeginForm("FileUpload", "FileUpload", FormMethod.Post, new { enctype = "multipart/form-data" })) { %>        
        <input name="uploadFile" type="file" />      
        <input type="submit" value="Upload File" />
    <% } %>
</asp:Content>

Controller:

[HandleError]
public class FileUploadController : Controller
{    
    public ActionResult FileUpload()    
    { 
         return View();    
    }   

    [AcceptVerbs(HttpVerbs.Post)]    
    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();    
    }
}

Where I wrong?

Thanks,

 [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Upload(HttpPostedFileBase uploadFile)
    {
        if (uploadFile.ContentLength > 0)
        {

          string filePath = 
     Path.Combine(HttpContext.Server.MapPath("~/resim"),      Path.GetFileName
      (uploadFile.FileName));
            uploadFile.SaveAs(filePath);

        }

Only that you read the markdown editing help section (or click the little ? at top right of the edit box. — Oded
– Oded, Commented May 23, 2011 at 8:32

Darin Dimitrov · Accepted Answer · 2011-05-18 21:12:24Z

3

Ensure that the user has selected a file by checking if uploadFile is not null before processing it:

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

Also ensure you have read the following blog post.

edited May 18, 2011 at 21:12

answered May 18, 2011 at 21:06

Darin Dimitrov

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6 Comments

Arbelac Over a year ago

@Darin Dimitrov- I can't install a file that is .flv extension ,but I can install a file that is .jpeg extension.

Darin Dimitrov Over a year ago

@Arbelac, what do you mean by installing a .flv extension file?

Arbelac Over a year ago

@ Darin Dimitrov - So, I can't upload a .flv extension file.if I change as .jpeg extension of the the same file,it's working.

Darin Dimitrov Over a year ago

@Arbelac, what does can't mean? Error message? Something else?

Arbelac Over a year ago

@Darin Dimitrov - Here is my error message. ressim.net/s/upload/82db7d36.jpg ressim.net/s/upload/9bafcde2.jpg

|

BZink · Accepted Answer · 2011-05-18 23:22:28Z

1

I don't take the file as an Action parameter, I usually just pull it from the request. You're sending the file via a html form post, I presume?

public ActionResult FileUpload()
{

    foreach(var file in Request.Files)
    {
         //do something

    } 

    return
}

answered May 18, 2011 at 23:22

BZink

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