How to return big file in ASP.NET MVC as a FileStreamResult straight away without waiting for it to be fully downloaded on server side?

Question

I'm trying to get a file which size is 100MB and return a stream result. I have to wait for "Save as..." window for about 1 minute until it is fully downloaded on server side and then after choosing file name and accepting - it saves very quickly without showing progress. But when I return a file from file system as FilePathResult, it works good.

Example:

public async Task<FileResult> GetFile()
{
    HttpClient client = new HttpClient();
    var response = await client.GetAsync("https://speed.hetzner.de/1GB.bin");
    var stream = await response.Content.ReadAsStreamAsync();

    return File(stream, "application/zip");
}

What should I do to display "Save as..." window straight away and then see how much bytes were actually downloaded?

score 1 · Accepted Answer · answered Feb 28 '19 at 06:05

1

Please see this question for a solution: C# Stream Response from 3rd party, minimal buffering

answered Feb 28 '19 at 06:05

benq143

301
2
6

It works! Thank you :) – Governor Feb 28 '19 at 07:33

How to return big file in ASP.NET MVC as a FileStreamResult straight away without waiting for it to be fully downloaded on server side?

1 Answers1