使用FtpWebRequest将大文件上传到FTP导致"底层连接已关闭"

Question

我正在尝试将相对较大的文件上传到FTP服务器(250-300mb).我在控制台应用程序中执行此操作.

当文件是几MB时,我的程序工作正常,但是大的文件导致:

System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive.

我试图设置超时,但我仍然得到错误.

知道如何修改我的代码,所以我没有得到错误？

我的上传代码:

using(var fs = File.OpenRead(zipFileName)) 
            {
                var ms = new MemoryStream();
                ms.SetLength(fs.Length);
                fs.Read(ms.GetBuffer(), 0, (int) fs.Length);

                FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpUrl + "/" + zipFileName);
                ftp.Credentials = new NetworkCredential(ftpUid, ftpPassword);
                ftp.Timeout = 30000;
                ftp.KeepAlive = true;
                ftp.UseBinary = true;
                ftp.Method = WebRequestMethods.Ftp.UploadFile;


                byte[] buffer = new byte[ms.Length];
                ms.Read(buffer, 0, buffer.Length);
                ms.Close();

                Stream ftpstream = ftp.GetRequestStream();
                ftpstream.Write(buffer, 0, buffer.Length);
                ftpstream.Close();
            }

Answer 1

我使用您的代码将1 GB文件上传到我的FTP服务器.我也得到了System.Net.WebException.要修复它,我将超时设置为-1(不要超时).之后,上传工作.

ftp.Timeout = -1; // No Timeout

另一方面,我不确定为什么要将文件读入MemoryStream然后将其放入byte []缓冲区.它会更快并且使用更少的内存来将FileStream复制到FTP RequestStream.

using (var fs = File.OpenRead(zipFileName))
{
    FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpUrl + "/" + zipFileName);
    ftp.Credentials = new NetworkCredential(ftpUid, ftpPassword);
    ftp.Timeout = -1;
    ftp.KeepAlive = true;
    ftp.UseBinary = true;
    ftp.Method = WebRequestMethods.Ftp.UploadFile;

    Stream ftpstream = ftp.GetRequestStream();
    fs.CopyTo(ftpstream); // Copy the FileStream to the FTP RequestStream
    ftpstream.Close();

    // You should also check the response
    FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
    Console.WriteLine("Code: {0}", response.StatusCode);
    Console.WriteLine("Desc: {0}", response.StatusDescription);
}