c# - FTP 上传 0 字节

Question

情况

我有一些代码可以上传文件，在这种情况下通常是 .csv 到远程 FTP 站点

代码

    try
    {
        /* Create an FTP Request */
        ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile);
        /* Log in to the FTP Server with the User Name and Password Provided */
        ftpRequest.Credentials = new NetworkCredential(user, pass);
        /* When in doubt, use these options */
        ftpRequest.UseBinary = false;
        ftpRequest.UsePassive = false;
        ftpRequest.KeepAlive = true;
        /* Specify the Type of FTP Request */
        ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
        /* Establish Return Communication with the FTP Server */
        ftpStream = ftpRequest.GetRequestStream();
        /* Open a File Stream to Read the File for Upload */
        FileStream localFileStream = new FileStream(localFile, FileMode.Create);
        /* Buffer for the Downloaded Data */
        byte[] byteBuffer = new byte[bufferSize];
        int bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
        /* Upload the File by Sending the Buffered Data Until the Transfer is Complete */
        try
        {
            while (bytesSent != 0)
            {
                ftpStream.Write(byteBuffer, 0, bytesSent);
                bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
            }
        }
        catch (Exception ex) { Console.WriteLine(ex.ToString()); }
        /* Resource Cleanup */
        localFileStream.Close();
        ftpStream.Close();
        ftpRequest = null;
    }
    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
    return;
}

问题

程序成功建立连接，似乎可以上传我的文件，但 .csv 为空且文件大小为 0 字节。我的代码中是否有任何可能导致此问题的内容？

Answer 1

您是否发现您的本地文件也被截断为 0 字节？我认为问题出在这里:

FileStream localFileStream = new FileStream(localFile, FileMode.Create);

您应该使用 FileMode.Open 或 FileMode.OpenOrCreate 打开文件。 documentation for FileMode.Create指出“如果文件已经存在，它将被覆盖。”并且“FileMode.Create 相当于请求如果文件不存在，则使用 CreateNew；否则，使用 Truncate”。