ASP.NEt Uploading large files from the server to the front and downloading it

Question

i made a controller that calls the service, and ate to write 1 MB to the server Controller

  [HttpGet("Download")]
    public async Task DownloadFile()
    {

       await _dataTransfer.DownloadFile(ControllerContext);
    }

Service

 public async Task DownloadFile(ControllerContext controllerContext)
    {
        var response = controllerContext.HttpContext.Response;
        var request = controllerContext.HttpContext.Request;
        var fileStream = new FileStream(Path.Combine(_path, _fileZip), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
        var buffer = new byte[1024 * 1024]; // 1 MB buffer

        try
        {
            var fileSize = fileStream.Length;

            // Parse the range header to determine the byte range to send
            var rangeHeader = request.Headers["Range"].ToString();
            long start = 0, end = fileSize - 1;

            if (!string.IsNullOrEmpty(rangeHeader))
            {
                var range = rangeHeader.Replace("bytes=", "").Split('-');
                long.TryParse(range[0], out start);
                if (range.Length > 1 && long.TryParse(range[1], out end))
                {
                    if (end > fileSize - 1) end = fileSize - 1;
                }
            }

            // Set the Content-Length header with the length of the range to send
            var contentLength = end - start + 1;
            response.Headers.Add("Content-Length", contentLength.ToString());

            //// Set the Content-Range header with the range being sent
            //response.Headers.Add("Content-Range", $"bytes {start}-{end}/{fileSize}");

            // Set the status code to Partial Content (206)
            response.StatusCode = (int)HttpStatusCode.PartialContent;

            // Set the content type and disposition headers
            response.ContentType = "application/octet-stream";
            response.Headers.Add("Content-Disposition", $"attachment; filename={Path.GetFileName(_path)}");

            // Seek to the start of the range
            fileStream.Seek(start, SeekOrigin.Begin);

            // Send the range in 1MB chunks
            int bytesRead;
            while ((bytesRead = await fileStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
            {
                if (response.Body.CanWrite)
                {
                    await response.Body.WriteAsync(buffer, 0, bytesRead);
                    await response.Body.FlushAsync();
                }
                await _hubContext.Clients.All.SendAsync("Download", $"bytes - {bytesRead} / {fileSize}");
            }

            response.StatusCode = (int)HttpStatusCode.OK;
        }
        catch (Exception ex)
        {
            _logger.Log(LogLevel.Error, ex.Message, ex?.InnerException);
        }
        finally
        {
            fileStream.Dispose();
        }
    }

The problem is that the Response has already been sent, and it can no longer be used, I can’t find other ways to send data

Maybe there are examples of download, upload large files from the server to the front, and back

ASP.NEt Uploading large files from the server to the front and downloading it

0 Answers0