: Converting the string back to a file format in the browser for the user to save. 1. Server-Side: Converting and Sending the File
[HttpPost] public IActionResult GetBase64File(string fileName) { // 1. Get the physical path or database record string path = Path.Combine(_env.WebRootPath, "files", fileName); // 2. Read file as a byte array byte[] fileBytes = System.IO.File.ReadAllBytes(path); // 3. Convert to Base64 string base64String = Convert.ToBase64String(fileBytes); // 4. Return as content (or wrap in a JSON object) return Content(base64String); } Use code with caution. Source: ASPSnippets 2. Client-Side: Triggering the Download Download file from url and convert to base64 async (C#) asp.net download base64 file
Downloading files as Base64 strings in ASP.NET is a common requirement for modern web applications, particularly when dealing with AJAX requests, single-page applications (SPAs), or databases where file content is stored as text. This guide explores how to handle Base64 file downloads using both server-side and client-side approaches. Understanding the Base64 Workflow A typical "download Base64" flow involves: : Converting the string back to a file