application/vnd.openxmlformats-officedocument.wordprocessingml.document .zip ZIP Archive application/zip .csv Comma-Separated Values text/csv .png image/png
using System.IO; using System.Web.Mvc; public class DocumentController : Controller // Action to trigger the file download public ActionResult DownloadDocument() fileData.Length == 0) return HttpNotFound("The requested file could not be found."); // 2. Define the target filename and its MIME type string fileName = "Report_2026.pdf"; string contentType = "application/pdf"; // 3. Return the FileResult using the File helper overload return File(fileData, contentType, fileName); // Dummy method simulating data retrieval from a database or API private byte[] GetFileByteArray() // Example: converting text to bytes for demonstration using (MemoryStream ms = new MemoryStream()) using (StreamWriter writer = new StreamWriter(ms)) writer.Write("This is a sample PDF or document content generated from a byte array."); writer.Flush(); return ms.ToArray(); Use code with caution. 2. Common MIME Content Types asp.net mvc download file from byte array
In ASP.NET MVC, web applications frequently need to generate files dynamically—such as PDFs, Excel spreadsheets, or images—and serve them directly to the user. When these files are stored or processed in memory as a byte[] (byte array), ASP.NET MVC provides a built-in, elegant mechanism to return them via the FileResult action result. application/vnd
Often, third-party libraries (like EPPlus for Excel or iTextSharp/QuestPDF for PDFs) generate assets directly into a MemoryStream . You can easily extract the byte array using the .ToArray() method before passing it to the File() helper. Often, third-party libraries (like EPPlus for Excel or
This guide provides a comprehensive overview of how to download files from a byte array in ASP.NET MVC, covering standard implementations, handling different file types, and managing large file transfers efficiently. 1. The Core Implementation: File() Helper Method