[HttpGet] public IActionResult DownloadPdf() { // Retrieve your byte array (e.g., from a database or service) byte[] pdfBytes = GetPdfByteArrayFromSource(); // Return the file using the application/pdf MIME type // Providing a filename triggers a browser download return File(pdfBytes, "application/pdf", "GeneratedDocument.pdf"); } Use code with caution.
In modern ASP.NET Core web applications, the most efficient way to serve a PDF from a byte array is by using the File() method within a controller. This method automatically sets the required HTTP headers for the browser to recognize the response as a downloadable file. download pdf from byte array c#
Downloading a PDF from a byte array in C# is a common task for developers who need to serve dynamically generated documents or files retrieved from a database. Whether you are working with ASP.NET Core, MVC, or a console application, the core process involves converting raw binary data into a stream and returning it with the correct MIME type. Downloading in ASP.NET Core / MVC Downloading a PDF from a byte array in
Return the file normally as shown in the ASP.NET Core section. using System
using System.IO; byte[] pdfBytes = GetPdfByteArrayFromSource(); string filePath = @"C:\Downloads\MyFile.pdf"; // Writes the entire byte array to the specified path File.WriteAllBytes(filePath, pdfBytes); Use code with caution. Advanced Scenarios: AJAX and Client-Side Downloads