How to Upload a File in ASP .NET MVC?
Uploading a file in ASP .NET MVC: An Overview
In this MVC Tutorial, we will see how to upload a file. Uploading a file in the ASP.NETMVC application is very easy. The posted file is automatically available as a HttpPostedFileBase parameter in the action of the controller. For uploading a file on the server you are required to have a file input control within HTML form having the encoding type set to multipart/form-data. The default encoding type of a form is application/x-www-form-urlencoded and this is not sufficient for posting a large amount of data to the server.
Read More: MVC Interview Questions and Answers
Let's See How to Do It
Step 1: Form for uploading the file
@using (Html.BeginForm("FileUpload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.ValidationSummary();
<ol>
<li class="lifile">
<input type="file" id="fileToUpload" name="file" />
<span class="field-validation-error" id="spanfile"></span>
</li>
</ol>
<input type="submit" id="btnSubmit" value="Upload" />
}
Step 2: Validating the file on the client side
<script type="text/jscript">
//get file size
function GetFileSize(fileid) {
try
{
var fileSize = 0;
//for IE
if ($.browser.msie)
{
//before making an object of ActiveXObject,
//please make sure ActiveX is enabled in your IE browser
var objFSO = new ActiveXObject("Scripting.FileSystemObject"); var filePath = $("#" + fileid)[0].value;
var objFile = objFSO.getFile(filePath);
var fileSize = objFile.size; //size in kb
fileSize = fileSize / 1048576; //size in mb
}
//for FF, Safari, Opeara and Others
else
{
fileSize = $("#" + fileid)[0].files[0].size //size in kb
fileSize = fileSize / 1048576; //size in mb
}
return fileSize;
}
catch (e)
{
alert("Error is :" + e);
}
}
//get file path from client system
function getNameFromPath(strFilepath)
{
var objRE = new RegExp(/([^\/\\]+)$/);
var strName = objRE.exec(strFilepath);
if (strName == null)
{
return null;
}
else
{
return strName[0];
}
}
$("#btnSubmit").live("click", function ()
{
if ($('#fileToUpload').val() == "")
{
$("#spanfile").html("Please upload file");
return false;
}
else
{
return checkfile();
}
});
function checkfile()
{
var file = getNameFromPath($("#fileToUpload").val());
if (file != null)
{
var extension = file.substr((file.lastIndexOf('.') + 1));
// alert(extension);
switch (extension) {
case 'jpg':
case 'png':
case 'gif':
case 'pdf':
flag = true;
break;
default:
flag = false;
}
}
if (flag == false)
{
$("#spanfile").text("You can upload only jpg,png,gif,pdf extension file");
return false;
}
else
{
var size = GetFileSize('fileToUpload');
if (size > 3)
{
$("#spanfile").text("You can upload file up to 3 MB");
return false;
}
else
{
$("#spanfile").text("");
}
}
}
$(function ()
{
$("#fileToUpload").change(function () {
checkfile();});
});
</script>
Step 3: Controller's action for receiving the posted file
[HttpPost]
public ActionResult FileUpload(HttpPostedFileBase file)
{
if (ModelState.IsValid)
{
if (file == null)
{
ModelState.AddModelError("File", "Please Upload Your file");
}
else if (file.ContentLength > 0)
{
int MaxContentLength = 1024 * 1024 * 3; //3 MB
string[] AllowedFileExtensions = new string[] { ".jpg", ".gif", ".png", ".pdf" };
if (!AllowedFileExtensions.Contains(file.FileName.Substring(file.FileName.LastIndexOf('.'))))
{
ModelState.AddModelError("File", "Please file of type: " + string.Join(", ", AllowedFileExtensions));
}
else if (file.ContentLength > MaxContentLength)
{
ModelState.AddModelError("File", "Your file is too large, maximum allowed size is: " + MaxContentLength + " MB");
}
else
{
//TO:DO
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/Content/Upload"), fileName);
file.SaveAs(path);
ModelState.Clear();
ViewBag.Message = "File uploaded successfully";
}
}
}
return View();
}
How it works...
Summary
I hope you will enjoy the tips while working with MVC. I would like to have feedback from my blog readers. Your valuable feedback, questions, or comments about this article are always welcome. Enjoy Coding..!
Unlock the Next level of MVC
FAQs
Q1. How to upload file in MVC Razor?
Q2. How to upload drag-and-drop file in asp net MVC?
Take our free skill tests to evaluate your skill!
In less than 5 minutes, with our skill test, you can identify your knowledge gaps and strengths.