CODEWITHSUNDEEP
c#asp.net-web-api
developer82
developer82

Reputation: 13733

Simulate file download with WEB API

I have a web api controller and I want to write a function that simulates a file download (not a real file - just something that is generated on the fly).

What I would like to do is send that api a parameter with file size and have it return a "binary" file generated on the fly.

something similar to this php code:

<?php
    $filesize = 20971520; // 20 Mo

    if (isset($_POST['d'])) {
        header('Cache-Control: no-cache');
        header('Content-Transfer-Encoding: binary');
        header('Content-Length: '. $filesize);

        for($i = 0 ; $i < $filesize ; $i++) {
            echo chr(255);
        }
    }
?>

The closest solution I found was something like this:

HttpResponseMessage response = new HttpResponseMessage();
response.Content = new StreamContent(new FileStream(@"path to image")); // this file stream will be closed by lower layers of web api for you once the response is completed.
response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");

I tried playing around with it and change it but had no luck.

would appriciate if someone could point me in the right direction and help me out.

Thanks

Upvotes: 0

Views: 738

Answers (1)

Stephen Byrne
Stephen Byrne

Reputation: 7505

Something like this?

public class FakeDownloadController: ApiController
{
    public HttpResponseMessage Get([FromUri] int size)
            {
                var result = new HttpResponseMessage(HttpStatusCode.OK);
                byte[] data = new byte[size];
                var stream = new MemoryStream(data);
                result.Content = new StreamContent(stream);
                result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/binary");
                var contentDisposition = new ContentDispositionHeaderValue("attachment");
                contentDisposition.FileName = string.Format("{0}.{1}", "dummy","bin");
                result.Content.Headers.ContentDisposition = contentDisposition;
                return result;
            }
}

usage:

http://localhost:port/api/FakeDownload/?size=6543354

will return a ~6 MB file filled with NULL, called "dummy.bin".

Hope that helps.

Upvotes: 1

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