Question

我想创建一个asp.net下载页面。我从dataservice接收文件作为字节数组。文件大小最大可达10GB。所以我需要“部分”传输文件。

这是我的代码：

Response.ContentType = "application/octet-stream"
Response.AddHeader("Content-Disposition", _
              "attachment; filename=" & HttpUtility.UrlEncode(file.Name))

Do
 If Not Response.IsClientConnected Then
    Exit Do
 End If

 result =ReadByte(offset,length) 'read next byte array

 Response.BinaryWrite(fresult.Data)
 Response.Flush()

Loop Until 'all bytes read

代码段有效，但我遇到了很大问题。在用户确认浏览器下载对话框之前，下载已经开始。如果用户等待5分钟，他已经下载了10gb文件而没有接受它。

你有解决方案吗？

谢谢

Answer 1

此代码只需将其更新为从文件而不是Web响应中读取

using (WebResponse fileDownloadResponse = fileToDownload.GetResponse())
            {
                using (Stream fileStream = fileDownloadResponse.GetResponseStream())
                {
                    using (StreamReader fileStreamReader = new StreamReader(fileStream))
                    {

                        context.Response.ContentType = "APPLICATION/OCTET-STREAM";



                        context.Response.AddHeader("Content-Length", fileDownloadResponse.ContentLength.ToString());

                        string fileName = Path.GetFileNameWithoutExtension(url);
                        string fileExtension = Path.GetExtension(fileUriBuilder.Uri.AbsolutePath);
                        context.Response.AddHeader("Content-Disposition", "attachment; filename="+fileName+fileExtension);

                        byte[] buffer = new byte[4096];

                        int byteseq = fileStream.Read(buffer, 0, 4096); while (byteseq > 0)
                        {

                            context.Response.OutputStream.Write(buffer, 0, byteseq);
                            context.Response.Flush();
                            byteseq = fileStream.Read(buffer, 0, 4096);

                        }

                    }
                }
            }

asp.net文件下载

1 个答案: