問題描述

我正在使用以下代碼 (C# .NET 3.5) 上傳文件:

I am using below code (C# .NET 3.5) to upload a file:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://someweb.mn/altanzulpharm/file12.zip");
request.Method = WebRequestMethods.Ftp.UploadFile;
request.KeepAlive = true;
request.UseBinary = true;
request.Credentials = new NetworkCredential(username, password);

FileStream fs = File.OpenRead(FilePath);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();

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

但是當(dāng)互聯(lián)網(wǎng)中斷時(shí)上傳會(huì)中斷.中斷發(fā)生的時(shí)間非常短，幾乎是一毫秒.但是上傳會(huì)永遠(yuǎn)中斷！

But the upload breaks when internet interrupted. Interruption occurs for a very small amount of time, almost a millisecond. But uploading breaks forever!

網(wǎng)絡(luò)中斷后是否可以繼續(xù)或恢復(fù)上傳?

Is it possible to continue or resume uploading after interruption of internet?

推薦答案

FtpWebRequest中斷連接后恢復(fù)傳輸?shù)奈ㄒ环椒ㄊ侵匦逻B接并開始寫入文件末尾.

The only way to resume transfer after a connection is interrupted with FtpWebRequest, is to reconnect and start writing to the end of the file.

為此使用 FtpWebRequest.ContentOffset.

完整代碼上傳的相關(guān)問題(盡管針對(duì) C#):
如何在斷開連接的情況下自動(dòng)恢復(fù)下載FTP文件

A related question for upload with full code (although for C#):
How to download FTP files with automatic resume in case of disconnect

或者使用可以自動(dòng)恢復(fù)傳輸?shù)?FTP 庫.

Or use an FTP library that can resume the transfer automatically.

例如 WinSCP .NET 程序集.有了它，可恢復(fù)的上傳就變得如此簡單:

For example WinSCP .NET assembly does. With it, a resumable upload is as trivial as:

// Setup session options
var sessionOptions = new SessionOptions
{
    Protocol = Protocol.Ftp,
    HostName = "ftp.example.com",
    UserName = "user",
    Password = "mypassword"
};

using (var session = new Session())
{
    // Connect
    session.Open(sessionOptions);

    // Resumable upload
    session.PutFileToDirectory(@"C:pathfile.zip", "/home/user");
}

(我是 WinSCP 的作者)

這篇關(guān)于網(wǎng)絡(luò)中斷后如何繼續(xù)或恢復(fù) FTP 上傳的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！