Download File Using Jquery Ajax C# Free [ 2025-2027 ]

How to download file via jQuery ajax and C# - Stack Overflow

: Send data to the server; the server generates the file and stores it in a temporary folder or cache. download file using jquery ajax c#

[HttpPost] public ActionResult DownloadReport(int reportId) { // 1. Generate or fetch your file data byte[] fileBytes = System.IO.File.ReadAllBytes(Server.MapPath("~/App_Data/report.pdf")); string fileName = "Report_" + reportId + ".pdf"; // 2. Return the file with the appropriate content type return File(fileBytes, "application/pdf", fileName); } Use code with caution. How to download file via jQuery ajax and

To download a file using , you generally follow one of two modern approaches: returning the file as a Blob or using a Redirect/Hidden Iframe strategy. Method 1: The Modern Blob Approach (Recommended) Return the file with the appropriate content type

This is the most seamless method. You request the file as binary data and use JavaScript to create a temporary download link. 1. The C# Backend (MVC/Web API)

: For very large files, the Blob approach can consume significant client-side memory. The "Two-Step" approach is safer for multi-gigabyte downloads.

Downloading files via AJAX is a common requirement when you need to send dynamic data (like a filtered report) to a C# backend and receive a file in return without refreshing the page. Traditionally, AJAX cannot directly trigger a "Save As" dialog because it is designed for text-based data exchanges.