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Posted 17 Nov 2016


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How to Create and Download File with Ajax in ASP.NET MVC

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17 Nov 2016CPOL
Create and download the file with Ajax call in ASP.NET MVC


When you use the Ajax call in ASP.NET MVC, you can just return a JSON object but not a file. If you want to do that, you need to create and save the file in server and return its path to Ajax.

After that, you can call a redirect link for downloading the file, because this is a temp file, so you should need to delete it after download.

Using the Code

The below demo code is just for creating and downloading an Excel file:

  1. Create an Action for generating the Excel:
    public JsonResult ExportExcel()
        DataTable dt = DataService.GetData();
        var fileName = "Excel_" + DateTime.Now.ToString("yyyyMMddHHmm") + ".xls";
        //save the file to server temp folder
        string fullPath = Path.Combine(Server.MapPath("~/temp"), fileName);
        using (var exportData = new MemoryStream())
            //I don't show the detail how to create the Excel, this is not the point of this article,
            //I just use the NPOI for Excel handler
            Utility.WriteDataTableToExcel(dt, ".xls", exportData);
            FileStream file = new FileStream(fullPath, FileMode.Create, FileAccess.Write);
        var errorMessage = "you can return the errors in here!";
        //return the Excel file name
        return Json(new { fileName = fileName, errorMessage = "" });
  2. Create the download Action:
    [DeleteFileAttribute] //Action Filter, it will auto delete the file after download, 
                          //I will explain it later
    public ActionResult Download(string file)
        //get the temp folder and file path in server
        string fullPath = Path.Combine(Server.MapPath("~/temp"), file);
        //return the file for download, this is an Excel 
        //so I set the file content type to "application/"
        return File(fullPath, "application/", file);
  3. We need to auto delete the file after download, so we need to create an Action Filter:
    public class DeleteFileAttribute : ActionFilterAttribute
        public override void OnResultExecuted(ResultExecutedContext filterContext)
            //convert the current filter context to file and get the file path
            string filePath = (filterContext.Result as FilePathResult).FileName;
            //delete the file after download
  4. Use the Ajax call in frontend:
    //I use blockUI for loading...
    $.blockUI({ message: '<h3>Please wait a moment...</h3>' });    
        type: "POST",
        url: '@Url.Action("ExportExcel","YourController")', //call your controller and action
        contentType: "application/json; charset=utf-8",
        dataType: "json",
    }).done(function (data) {
        //get the file name for download
        if (data.fileName != "") {
            //use window.location.href for redirect to download action for download the file
            window.location.href = "@Url.RouteUrl(new 
                { Controller = "YourController", Action = "Download"})/?file=" + data.fileName;


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Comments and Discussions

GeneralMy vote of 5 Pin
Mike_Finch18-Jun-21 12:53
MemberMike_Finch18-Jun-21 12:53 
GeneralRe: My vote of 5 Pin
winsonet25-Aug-21 2:47
Memberwinsonet25-Aug-21 2:47 
QuestionCan u please share the code of "Utility.WriteDataTableToExcel" function Pin
Member 1032029310-Jul-18 20:31
MemberMember 1032029310-Jul-18 20:31 
QuestionCan u please share the code of "Utility.WriteDataTableToExcel" function Pin
sarfraz4095-Jul-18 21:47
Membersarfraz4095-Jul-18 21:47 
QuestionThanks Pin
Majid Qafouri22-Jan-18 22:27
MemberMajid Qafouri22-Jan-18 22:27 
QuestionAwesome work!!! Pin
Ghouse M1-Jan-18 7:42
MemberGhouse M1-Jan-18 7:42 
QuestionThanks from Argentina Pin
MarceloGuy30-Sep-17 7:25
MemberMarceloGuy30-Sep-17 7:25 
AnswerRe: Thanks from Argentina Pin
winsonet29-Nov-17 14:54
Memberwinsonet29-Nov-17 14:54 
GeneralThank Pin
Elvin Acevedo30-Jun-17 9:14
MemberElvin Acevedo30-Jun-17 9:14 
GeneralRe: Thank Pin
winsonet20-Jul-17 5:46
Memberwinsonet20-Jul-17 5:46 

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