C#SFTP上传文件

Question

我正试图将文件上载到linux服务器，但我收到一个错误，错误是：“无法连接到远程服务器”。我不知道我的代码是否错误，或者连接是否被服务器阻止了——使用相同的细节，我可以将服务器与FileZilla连接起来。

我的代码：

    const string UserName = "userName";
    const string Password = "password";
    const string ServerIp = "11.22.333.444/";

    public bool UploadFile(HttpPostedFileBase file)
    {
        string fileName = file.FileName;

        var serverUri = new Uri("ftp://" + ServerIp + fileName);


        // the serverUri should start with the ftp:// scheme.
        if (serverUri.Scheme != Uri.UriSchemeFtp)
            return false;

        try
        {
            // get the object used to communicate with the server.
            var request = (FtpWebRequest)WebRequest.Create(serverUri);

            request.EnableSsl = true;
            request.UsePassive = true;
            request.UseBinary = true;
            request.Credentials = new NetworkCredential(UserName, Password);
            request.Method = WebRequestMethods.Ftp.UploadFile;

            // read file into byte array
            var sourceStream = new StreamReader(file.InputStream);
            byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            request.ContentLength = fileContents.Length;

            // send bytes to server
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(fileContents, 0, fileContents.Length);
            requestStream.Close();

            var response = (FtpWebResponse)request.GetResponse();
            Console.WriteLine("Response status: {0}", response.StatusDescription);
        }
        catch (Exception exc)
        {
            throw exc;
        }
        return true;
    }

Answer 1

您在这里尝试的是建立一个FTPS连接，而不是SFTP连接。EnableSsl选项仅激活TLS上的FTP（因此FTPS）。它使用端口21连接到服务器。

如果您确实在FileZilla中激活了SFTP，则必须使用端口22上的SSH连接才能连接到服务器（SFTP=SSH文件传输协议）。最简单的方法应该是使用SharpSSH。

你也可以看看这个问题。

Answer 2

我找到的最好的library/NuGet包是SSH。网由伦西。打开Nuget Package Manager并将其安装到项目中。

上传可以通过存储文件或byte[]文件完成。

// you could pass the host, port, usr, and pass as parameters
public void FileUploadSFTP()
{
    var host = "whateverthehostis.com";
    var port = 22;
    var username = "username";
    var password = "passw0rd";
    
    // http://stackoverflow.com/questions/18757097/writing-data-into-csv-file/39535867#39535867
    byte[] csvFile = DownloadCSV(); // Function returns byte[] csv file

    using (var client = new SftpClient(host, port, username, password))
    {
        client.Connect();
        if (client.IsConnected)
        {
            Debug.WriteLine("I'm connected to the client");

            using (var ms = new MemoryStream(csvFile))
            {
                client.BufferSize = (uint)ms.Length; // bypass Payload error large files
                client.UploadFile(ms, GetListFileName());
            }
        }
        else
        {
            Debug.WriteLine("I couldn't connect");
        }
    }
}

这是我用来作为资源让我开始的网站：http://blog.deltacode.be/2012/01/05/uploading-a-file-using-sftp-in-c-sharp/

它是为上传文件而写的。

// you could pass the host, port, usr, pass, and uploadFile as parameters
public void FileUploadSFTP()
{
    var host = "whateverthehostis.com";
    var port = 22;
    var username = "username";
    var password = "passw0rd";

    // path for file you want to upload
    var uploadFile = @"c:yourfilegoeshere.txt"; 

    using (var client = new SftpClient(host, port, username, password))
    {
        client.Connect();
        if (client.IsConnected)
        {
            Debug.WriteLine("I'm connected to the client");

            using (var fileStream = new FileStream(uploadFile, FileMode.Open))
            {
                
                client.BufferSize = 4 * 1024; // bypass Payload error large files
                client.UploadFile(fileStream, Path.GetFileName(uploadFile));
            }
        }
        else
        {
            Debug.WriteLine("I couldn't connect");
        }
    }
}

希望这对任何试图在C#中使用SFTP上传文件的人都有帮助。