下载文件Asp.Net

Question

我在文件系统中有.zip文件。 我要下载该文件。 到目前为止，我已经完成了

HttpContext.Current.Response.ContentType = "application/zip";
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + FileName);
            HttpContext.Current.Response.TransmitFile(zipName);
            HttpContext.Current.Response.End();

但是它直接打开文件而不是保存文件。 保存后如何下载呢？

我也看过DownloadFile(String, String)但是在我的情况下，第一个参数是什么？

Answer 1

您必须压缩，然后从该压缩中获取字节并将其传递

context.Response.AppendHeader("Content-Disposition", string.Format("attachment; filename={0}.{1}", fileName, fileExtension));
context.Response.ContentType = "application/octet-stream";
context.Response.OutputStream.Write(zipBytesArray, 0, zipBytesArray.Length);
context.Response.End();

Answer 2

如果您想从远程服务器下载它，则只需使用WebClient类

WebClient webClient = new WebClient();
webClient.DownloadFile(remoteFilePath, FileName);

要么

    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
    int bufferSize = 1;

    Response.Clear();
    Response.AppendHeader("Content-Disposition:", "attachment; filename=" +filename);
    Response.AppendHeader("Content-Length", resp.ContentLength.ToString());
    Response.ContentType = "application/download";

    byte[] ByteBuffer = new byte[bufferSize + 1];
    MemoryStream ms = new MemoryStream(ByteBuffer, true);
    Stream rs = req.GetResponse().GetResponseStream();
    byte[] bytes = new byte[bufferSize + 1];
    while (rs.Read(ByteBuffer, 0, ByteBuffer.Length) > 0)
    {
        Response.BinaryWrite(ms.ToArray());
        Response.Flush();
    }