C# 从FTP上传文件和下载文件

Upload file and download file from FTP

提问by Spreadzz

I am trying to make a program that uploads/downloads .exefile to a FTP

我正在尝试制作一个将.exe文件上传/下载到FTP

I tried using FtpWebRequest, but I only succeed to upload and download .txt files.

我尝试使用FtpWebRequest，但我只能成功上传和下载 .txt 文件。

Then i found here a solution for downloading using the WebClient:

然后我在这里找到了使用以下方法下载的解决方案WebClient：

WebClient request = new WebClient();
request.Credentials = new NetworkCredential("username", "password");
byte[] fileData =  request.DownloadData("ftp://myFTP.net/");

FileStream file = File.Create(destinatie);
file.Write(fileData, 0, fileData.Length);

file.Close();

This solution works. But I seen that WebClienthas a method DownloadFilewhich did not worked. I think because it doesn't work on FTPonly on HTTP. Is my assumption true? If not how can I get it to work?

此解决方案有效。但我看到WebClient有一种方法DownloadFile不起作用。我认为因为它FTP不仅适用于HTTP. 我的假设是真的吗？如果不是，我怎样才能让它工作？

And is there any other solution for uploading/downloading a .exefile to ftp using FtpWebRequest?

还有其他解决方案可以.exe使用 ftp上传/下载文件FtpWebRequest吗？

回答by JohnLBevan

You need to say whether you're uploading text or binary files. Add the following line after request is declared & initialised:

您需要说明是上传文本文件还是二进制文件。在声明和初始化请求后添加以下行：

request.UseBinary = true;

http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.usebinary.aspx

http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.usebinary.aspx

回答by newbieguy

Uploading is easy...

上传很简单...

void Upload(){
    Web client = new WebClient();
    client.Credentials = new NetworkCredential(username, password);
    client.BaseAddress = "ftp://ftpsample.net/";

    client.UploadFile("sample.txt", "sample.txt"); //since the baseaddress
}

---

---

下载也很容易...我在下面制作的代码使用 BackgroundWorkerBackgroundWorker（因此它不会在下载开始时冻结界面/应用程序）。另外，我使用了缩短了代码lambda拉姆达(=>)(=>)。

void Download(){
    Web client = new WebClient();
    client.Credentials = new NetworkCredential(username, password);

    BackgroundWorker bg = new BackgroundWorker();
    bg.DoWork += (s, e) => { 
        client.DownloadFile("ftp://ftpsample.net/sample.zip", "sample.zip"); 
    };
    bg.RunWorkerCompleted += (s, e) => { //when download is completed
        MessageBox.Show("done downloading");
        download1.Enabled = true; //enable download button
        progressBar.Value = 0; // reset progressBar
    };
    bg.RunWorkerAsync();
    download1.Enabled = false; //disable download button 
    while (bg.IsBusy)
    {
        progressBar.Increment(1); //well just for extra/loading
        Application.DoEvents(); //processes all windows messages currently in the message queue
    }
}

You can also use DownloadFileAsyncmethod to show real progress file downloading:

您还可以使用DownloadFileAsync方法来显示文件下载的真实进度：

client.DownloadFileAsync(new Uri("ftp://ftpsample.net/sample.zip"), "sample.zip");
client.DownloadProgressChanged += (s, e) =>
{
    progressBar.Value = e.ProgressPercentage; //show real download progress
};
client.DownloadFileCompleted += (s, e) =>
{
    progressBar.Visible = false;
    // other codes after the download
};
//You can remove the 'while' statement and use this ^

回答by Martin Prikryl

Both WebClient.UploadFileand WebClient.DownloadFilework correctly for FTP as well as binary files.

无论WebClient.UploadFile和WebClient.DownloadFile正确的FTP以及二进制文件的工作。

Upload

上传

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.UploadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

If you need a greater control, that WebClientdoes not offer (like TLS/SSL encryption, ascii/text transfer mode, etc), use FtpWebRequest. Easy way is to just copy a FileStreamto FTP stream using Stream.CopyTo:

如果您需要更好的控制WebClient（如TLS/SSL 加密、ascii/文本传输模式等），请使用FtpWebRequest. 简单的方法是FileStream使用Stream.CopyTo以下命令将 a 复制到 FTP 流：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    fileStream.CopyTo(ftpStream);
}

If you need to monitor an upload progress, you have to copy the contents by chunks yourself:

如果您需要监控上传进度，您必须自己分块复制内容：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        ftpStream.Write(buffer, 0, read);
        Console.WriteLine("Uploaded {0} bytes", fileStream.Position);
    } 
}

For GUI progress (WinForms ProgressBar), see:
How can we show progress bar for upload with FtpWebRequest

对于 GUI 进度 (WinForms ProgressBar)，请参阅：
如何使用 FtpWebRequest 显示上传进度条

If you want to upload all files from a folder, see
Recursive upload to FTP server in C#.

如果要上传文件夹中的所有文件，请参阅
在 C# 中递归上传到 FTP 服务器。

---

---

Download

下载

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.DownloadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

If you need a greater control, that WebClientdoes not offer (like TLS/SSL encryption, ascii/text transfer mode, etc), use FtpWebRequest. Easy way is to just copy an FTP response stream to FileStreamusing Stream.CopyTo:

如果您需要更好的控制WebClient（如TLS/SSL 加密、ascii/文本传输模式等），请使用FtpWebRequest. 简单的方法是将 FTP 响应流复制到FileStream使用Stream.CopyTo：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    ftpStream.CopyTo(fileStream);
}

If you need to monitor a download progress, you have to copy the contents by chunks yourself:

如果您需要监控下载进度，您必须自己分块复制内容：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fileStream.Write(buffer, 0, read);
        Console.WriteLine("Downloaded {0} bytes", fileStream.Position);
    }
}

For GUI progress (WinForms ProgressBar), see:
FtpWebRequest FTP download with ProgressBar

有关 GUI 进度 (WinForms ProgressBar)，请参阅：
FtpWebRequest FTP download with ProgressBar

If you want to download all files from a remote folder, see
C# Download all files and subdirectories through FTP.

如果要从远程文件夹
下载所有文件，请参阅C# 通过 FTP 下载所有文件和子目录。