: URL.createObjectURL(data) creates a temporary browser URL pointing to the file data in memory. Method 2: The Two-Step Approach (Token/Temp File)
: Ensure your C# code returns the correct MIME type (e.g., application/vnd.openxmlformats-officedocument.spreadsheetml.sheet for Excel) so the browser identifies the file correctly.
success: function (tempFileId) { // This triggers the browser's native download handler window.location.href = '/Home/ActualDownload?id=' + tempFileId; } Use code with caution. Critical Considerations download file using jquery ajax c#
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)
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) Critical Considerations This is the most seamless method
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.
If you are using older browsers or complex authentication that doesn't play well with Blobs, use the "Temp File" strategy. The C# Backend (MVC/Web API) To download a
: The server returns a unique ID or the file's temporary path.