Streaming files using HTTP GET : ASP .NET CORE API

Question

I have written a controller to download/stream file to the clients local machine. The code doesn't stream the file on doing a GET to the url besides only produces response body.

What is the problem with streamcontent method. On debug i could not find the issue.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using System.Net.Http;
using System.Net;
using System.IO;
using System.Text;

namespace FileDownloaderService.Controllers
{
    [Route("api/[controller]")]
    public class FileDownloadController : Controller
    {

        [HttpGet]
        public HttpResponseMessage Get() {
            string filename = "ASPNETCore" + ".pdf";
            string path = @"C:\Users\INPYADAV\Documents\LearningMaterial\"+ filename;

            if (System.IO.File.Exists(path)) {
                HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
                var stream = new FileStream(path, FileMode.Open);
                stream.Position = 0;
                result.Content = new StreamContent(stream);
                result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment") { FileName = filename };
                result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
                result.Content.Headers.ContentDisposition.FileName = filename;
                return result;
            }
            else
            {
                HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.Gone);
                return result;
            }
        }
        }
    }

Response:

{"version":{"major":1,"minor":1,"build":-1,"revision":-1,"majorRevision":-1,"minorRevision":-1},"content":{"headers":[{"key":"Content-Disposition","value":["attachment; filename=ASPNETCore.pdf"]},{"key":"Content-Type","value":["application/pdf"]}]},"statusCode":200,"reasonPhrase":"OK","headers":[],"requestMessage":null,"isSuccessStatusCode":true}

Write PDF stream to response stream might be helpful for this. — Poosh
– Poosh, Commented Jun 20, 2017 at 4:12
Is there any way i could use the HttpResponseMessage to stream the file to the local disk? — user6839132
– user6839132, Commented Jun 20, 2017 at 4:48

Pradeep Kumar · Accepted Answer · 2017-06-24 06:03:36Z

7

In ASP.NET Core, you need to be using an IActionResult if you are sending a custom response. All other responses will be serialized (JSON by default) and sent as response body.

Refer to the answer at File Streaming in ASP.NET Core

answered Jun 24, 2017 at 6:03

Pradeep Kumar

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