Convert Byte Array To Pdf And Download C# ~upd~ May 2026

window.downloadFile = (fileName, byteBase64) => { const link = document.createElement('a'); link.download = fileName; link.href = "data:application/pdf;base64," + byteBase64; document.body.appendChild(link); link.click(); document.body.removeChild(link); }; Use code with caution.

In older Web Forms projects, you manually manipulate the Response object to clear existing content and write binary data directly to the output stream.

@inject IJSRuntime JSRuntime Download PDF @code { async Task DownloadPdf() { byte[] pdfBytes = GetPdfBytes(); // Your source logic string base64 = Convert.ToBase64String(pdfBytes); await JSRuntime.InvokeVoidAsync("downloadFile", "Document.pdf", base64); } } Use code with caution. convert byte array to pdf and download c#

[HttpGet] public IActionResult DownloadPdf() { // 1. Obtain your PDF byte array (e.g., from a database or service) byte[] pdfBytes = _pdfService.GeneratePdfReport(); // 2. Return the FileResult // Parameters: byte array, MIME type, and suggested filename return File(pdfBytes, "application/pdf", "Report.pdf"); } Use code with caution. Always use application/pdf .

Providing a third parameter ensures the browser treats it as an attachment rather than opening it in a new tab. 2. Blazor (WebAssembly & Server) window

The most efficient way to handle this in modern .NET is by using the built-in File() method within a controller. This method automatically handles the MIME type and sets the Content-Disposition header to trigger a download.

Blazor cannot trigger a "Save As" dialog directly from C# because it runs in a security sandbox. Instead, you must pass the byte array to to create a temporary URL for the file. Step 1: The JavaScript Helper (wwwroot/js/download.js) javascript [HttpGet] public IActionResult DownloadPdf() { // 1

protected void btnDownload_Click(object sender, EventArgs e) { byte[] pdfBytes = GetPdfByteArray(); Response.Clear(); Response.ContentType = "application/pdf"; Response.AddHeader("Content-Disposition", "attachment; filename=GeneratedFile.pdf"); Response.BinaryWrite(pdfBytes); Response.End(); } Use code with caution. 4. Working with PDF Libraries Stack Overflowhttps://stackoverflow.com Convert Byte Array back to PDF in blazor - Stack Overflow