下载文件 Asp.Net

Question

我在文件系统中有.zip 文件。我想下载那个文件。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();

但它直接打开文件而不是保存它。保存的话怎么下载呢？

我也见过DownloadFile(String, String)，但我的第一个论点是什么？

Answer 1

您必须压缩，然后从该 zip 中获取字节并传递它们

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

如果你想从远程服务器下载它，那么你可以简单地使用 WebClient 类

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

或

    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();
    }