How to Crop and Upload Files to Asp.net Mvc Application

In this article, I am going to demonstrate you, how to upload file in ASP.NET MVC C# (you will see both, single or multiple files upload examples in ASP.NET MVC C# ), if y'all are looking for epitome upload you can have a look at this question https://qawithexperts.com/questions/14/how-to-upload-image-in-c-mvc.

Let's understand File Upload Basics in ASP.NET MVC C#

During the file upload process, only two parts of the MVC model interact with each other – a view and a controller. Allow'south examine the file upload process stride by step:

1. A user visits a spider web page with an uploader (represented by View) and chooses files to exist uploaded.
2. When the upload is started, the uploader packs the files into a POST request and sends this request to the server.
3. ASP.Internet caches all data in server memory or to disk depending on the uploaded file size.
4. ASP.Internet MVC defines the controller and appropriate action method that will handle the asking.
5. The action method handles the asking (for example, saves files on a hd, or updates a database, etc.) through the Controller.Asking property, which gets the HttpPostedFilesBase object for the electric current request.
6. ASP.NET MVC sends an respond to the client through Controller.Response.

You can configure file upload settings past specifying advisable attributes in the web.config (or machine.config if y'all want to make server-wide changes). Let's see what attributes are used to limit the file upload:

• maxRequestLength – the request size limit in kilobytes (the default value is 4096 KB).
• requestLengthDiskThreshold – the limit of data buffered in the server retentiveness in kilobytes (the default value is 80 KB).
• executionTimeout – the immune execution time for the request before being automatically close downward by ASP.NET (the default value is 110 seconds).

All these attributes should exist specified in the <httpRuntime> department.

Single File Upload in ASP.NET MVC, Pace past Footstep Implementation

Now permit'southward create a Project in Visual Studio to upload file

1. Become to File->New->Project. Give a suitable name to the Application. Click OK.

   

2. Select MVC Template from it

   

3. Now Let's add a folder to upload files on this Folder of the project.

   

4. At present let's Add a controller (UploadFileController) and the Code in it to handle mail request and handle File Upload

   

   Click on 'Add together' and then name it (UploadFileController), add together this code at present

                 [HttpPost]   public ActionResult Upload(HttpPostedFileBase file)   {       if (file != null && file.ContentLength > 0)           endeavor          {  //Server.MapPath takes the absolte path of folder 'Uploads'             string path = Path.Combine(Server.MapPath("~/Uploads"),                                          Path.GetFileName(file.FileName));              //Save file using Path+fileName take from in a higher place cord             file.SaveAs(path);               ViewBag.Bulletin = "File uploaded successfully";           }           catch (Exception ex)           {               ViewBag.Message = "Fault:" + ex.Message.ToString();           }       else      {           ViewBag.Message = "Y'all have non specified a file.";       }       return View();   }            

   Note: You may demand to Add System.IO reference in the above Controller

5. Add the Index View (Right click inside Alphabetize ActionMethod and and then 'Add' View), for creating File-upload handler in HTML, and and so add the code below to in your view

                 <h2>UploadFile</h2>       @using (Html.BeginForm ("Upload",                           "UploadFile",                           FormMethod.Post,                           new { enctype = "multipart/form-information" }))   {                         <label for="file">Upload File:</characterization>       <input type="file" name="file" id="file"/><br><br>       <input type="submit" value="Upload"/>       <br><br>       @ViewBag.Message   }            

   
   In a higher place image shows the output of the View.
   Notation: Always remmeber to add "enctype = "multipart/class-data"" in your HTML course, if y'all forget to write this piece of code in your HTML, your files will not be submitted on the C# controller.

6. In you browser view, browse a file using 'Cull File' button and endeavor to upload a file by clicking 'Upload' button, here is the debugging screenshot of file uploading, which shows, file was uploaded successfully

   

That's yous are done, check the 'Uploads' Folder in your project, you should found the file there

Annotation: The in a higher place lawmaking doesn't implement any security, you should scan your uploaded file using Viruses for improve security

Multiple File Upload in ASP.NET MVC C#

The to a higher place instance shows to upload single file in asp.net MVC, and then basically nosotros would have to loop multiple file uploads in C# code, while in front end terminate brand our HTML to multiple files, here are the changes which you need to do in C#

                      [HttpPost]  //Now nosotros are getting array of files check sign []         public ActionResult UploadFiles(HttpPostedFileBase[] files)           {                        //iterating through multiple file collection                    foreach (HttpPostedFileBase file in files)                   {                       //Checking file is bachelor to save.                       if (file != null)                       {                           var InputFileName = Path.GetFileName(file.FileName);                           var ServerSavePath = Path.Combine(Server.MapPath("~/Uploads/") + InputFileName);                           //Save file to server folder                           file.SaveAs(ServerSavePath);                           //assigning file uploaded condition to ViewBag for showing message to user.                           ViewBag.UploadStatus = files.Count().ToString() + " files uploaded successfully.";                       }                       }                             return View();           }                  

In the to a higher place lawmaking, since we are uploading files at in one case, we are passing HttpPostedFileBase array of files, then iterating each file using foreach loop, and saving file on server folder ("Uploads").

In HTML/View udpated .cshtml lawmaking will exist like below

          <br/> @using (Html.BeginForm("UploadFiles", "UploadFile", FormMethod.Mail, new { enctype = "multipart/grade-data" })) {      <div form="course-horizontal">                <div class="grade-group">            <div course="col-lg-2">Browse Files</div>             <div class="col-dr.-10">               <input type="file" multiple name="files" id="Files" />             </div>         </div>         <div grade="grade-group">             <div class="col-md-beginning-two col-md-10">                 <input type="submit" value="Upload" class="btn btn-primary" />             </div>         </div>         <div grade="form-group">             <div class="col-md-offset-2 col-md-ten text-success">                 @ViewBag.UploadStatus             </div>         </div>      </div> }                  

if you will notice, nosotros accept just added multiple an attribute in <input type='file'>above HTML code, to make it select multiple files, here is the sample View epitome

After selecting all file and clicking on Upload, here is the epitome of Controller while debugging, you can see we have got 3 files in Controller this time

That'south it, we are washed.

You may also like to read

File uploading using DropZone js & HTML5 in MVC

File Uploading using jQuery Ajax in MVC (Single or multiple file upload)

File upload in ASP.NET Core MVC (Single or Multiple files)

That's information technology we are done, feel free to postal service your comments on the above commodity or ask any questions related to file uploading in ASP.NET MVC.

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Source: https://qawithexperts.com/article/asp.net/uploading-files-in-aspnet-mvc-c-single-multiple-files/67