How to upload and download File using MVC

In this article I am going to explain how to upload and download File using MVC.

How to upload and download File using MVC


 Description:
I want to upload multiple files and can download them.  I want to save the file path to database and file to server.

Implementation:
 I have created a table tb_file.

Id
int
FileName
varchar(200)
Filepath
varchar(MAX)

Add a new MVC project.  I am using database first approach. Add entity data model for project.

Model (Tb_file.cs):

   public partial class Tb_File
    {
        public int Id { get; set; }
        public string FileName { get; set; }
        public string Filepath { get; set; }
    }


Add Controller
Now add an empty controller. Create action to upload file and download file.

Complete code of Controller:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MVC_Project.Models;
using System.IO;
namespace MVC_Project.Controllers
{
  
    public class FileController : Controller
    {
        DemoEntities1 db = new DemoEntities1();
        public ActionResult Index()
        {
            return View();          
        }
      
 [HttpPost]
        public ActionResult Index(IEnumerable<HttpPostedFileBase> files, Tb_File objfile)
        {
            foreach (var file in files)
            {
                if (file != null && file.ContentLength > 0)
                {
                    var fileName = Path.GetFileName(file.FileName);
                    var filepath = Guid.NewGuid().ToString() + fileName;
                    var path = Path.Combine(Server.MapPath("~/uploads"), filepath);
                    file.SaveAs(path);
                    objfile.FileName = fileName;
                    objfile.Filepath = "~/uploads/" + filepath;
                    db.Tb_File.Add(objfile);
                    db.SaveChanges();
                }
            }
            return View();
        }
       
   //download
 public ActionResult Download()
        {
            var file = db.Tb_File.ToList();
            return View(file);
        }
        
 public FileResult DownloadFile(string id)
        {
            int fid = Convert.ToInt32(id);
            string filename = (from f in db.Tb_File
                               where f.Id == fid
                               select f.Filepath).First();
            return File(filename, System.Net.Mime.MediaTypeNames.Application.Octet, filename);
        }

        }
            }


Add View
Now add view for Index and download action.

Index.cshtml:
@{
    ViewBag.Title = "Upload File's";
}                  
   @using (Html.BeginForm("", "", FormMethod.Post, new { enctype = "multipart/form-data" }))
                      {
                          <table>
                              <tr>
                                  <td>Upload File :</td>
                                  <td><input type="file" name="files" multiple="multiple" /></td>
                              </tr>
                              <tr>
                                  <td></td>
                                  <td></td>
                              </tr>
                              <tr>
                                  <td></td>
                                  <td><input type="submit" value="Upload File" /></td>
                              </tr>
                          </table>
                      }



Download.cshtml

@model IEnumerable<MVC_Project.Models.Tb_File>

@{
    ViewBag.Title = "Download";
}

<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.FileName)
        </th>
        <th>           
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.FileName)
        </td>
        <td></td>
        <td>
            @Html.ActionLink("Download", "DownloadFile", new { id = item.Id })
        </td>
    </tr>
}
</table>

Now build the project and run. To test it upload files and download them.



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