关于.net：如果可能，在C＃中使用FtpWebRequest实现不带第三方dll的FTP / SFTP

Achieving FTP/SFTP without 3rd party dll with FtpWebRequest if possible in C#

我正在尝试通过C＃中的FtpWebRequest类实现ftp / sftp，但到目前为止没有成功。

我不想使用任何第三方免费或付费dll。

凭证就像

主机名= sftp.xyz.com

用户ID = abc

密码= 123

我能够使用ip地址来实现ftp，但无法通过凭据获得上述主机名的sftp。

对于sftp，我已将FtpWebRequest类的EnableSsl属性启用为true，但出现错误，无法连接到远程服务器。

我可以使用相同的凭据和主机名连接Filezilla，但不能通过代码连接。

我观察到filezilla，它将主机名从sftp.xyz.com更改为sftp：//sftp.xyz.com
在文本框和命令行中，它将用户标识更改为[email protected]

我已经在代码中做了同样的事情，但没有成功完成sftp。

请对此进行紧急帮助。提前致谢。

下面是到目前为止的代码：

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private static void ProcessSFTPFile()
{
try
{
string[] fileList = null;
StringBuilder result = new StringBuilder();

string uri ="ftp://sftp.xyz.com";

FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri(uri));
ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
ftpRequest.EnableSsl = true;
ftpRequest.Credentials = new NetworkCredential("[email protected]","123");
ftpRequest.UsePassive = true;
ftpRequest.Timeout = System.Threading.Timeout.Infinite;

//ftpRequest.AuthenticationLevel = Security.AuthenticationLevel.MutualAuthRequested;
//ftpRequest.Proxy = null;
ftpRequest.KeepAlive = true;
ftpRequest.UseBinary = true;

//Hook a callback to verify the remote certificate
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);
//ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);

FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
while (line != null)
{
result.Append("ftp://sftp.xyz.com" + line);
result.Append("
");
line = reader.ReadLine();
}

if (result.Length != 0)
{
// to remove the trailing '
'
result.Remove(result.ToString().LastIndexOf('
'), 1);

// extracting the array of all ftp file paths
fileList = result.ToString().Split('
');
}

}
catch (Exception ex)
{
Console.WriteLine(ex.Message.ToString());
Console.ReadLine();
}
}

public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
if (certificate.Subject.Contains("CN=sftp.xyz.com"))
{
return true;
}
else
{
return false;
}
}

相关讨论

更新：

如果使用BizTalk，则可以使用ESB工具包使用SFTP适配器。自2010年以来一直受到支持。有人想知道为什么它没有出现在.Net Framework中

BizTalk Server 2013：以ESB工具包SFTP创建自定义适配器提供程序为例

BizTalk Server 2013：如何使用SFTP适配器

MSDN文件

不幸的是，目前仅与框架有关仍需要大量工作。放置sftp协议前缀不足以构成make-it-work，现在或将来可能仍然没有内置的.Net Framework支持。

-------------------------------------------------- -------

1)一个不错的库可以尝试使用SSHNet。

-------------------------------------------------- -------

它具有：

还有更多功能，包括内置的流支持。

API文档

较简单的API进行编码

文档中的示例代码：

清单目录

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/// <summary>
/// This sample will list the contents of the current directory.
/// </summary>
public void ListDirectory()
{
string host ="";
string username ="";
string password ="";
string remoteDirectory ="."; // . always refers to the current directory.

using (var sftp = new SftpClient(host, username, password))
{
sftp.Connect();

var files = sftp.ListDirectory(remoteDirectory);
foreach (var file in files)
{
Console.WriteLine(file.FullName);
}
}
}

上传文件

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/// <summary>
/// This sample will upload a file on your local machine to the remote system.
/// </summary>
public void UploadFile()
{
string host ="";
string username ="";
string password ="";
string localFileName ="";
string remoteFileName = System.IO.Path.GetFileName(localFile);

using (var sftp = new SftpClient(host, username, password))
{
sftp.Connect();

using (var file = File.OpenRead(localFileName))
{
sftp.UploadFile(remoteFileName, file);
}

sftp.Disconnect();
}
}

下载文件

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/// <summary>
/// This sample will download a file on the remote system to your local machine.
/// </summary>
public void DownloadFile()
{
string host ="";
string username ="";
string password ="";
string localFileName = System.IO.Path.GetFileName(localFile);
string remoteFileName ="";

using (var sftp = new SftpClient(host, username, password))
{
sftp.Connect();

using (var file = File.OpenWrite(localFileName))
{
sftp.DownloadFile(remoteFileName, file);
}

sftp.Disconnect();
}
}

-------------------------------------------------- -------

2)另一个替代库是WinSCP

-------------------------------------------------- -------

下面的例子：

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using System;
using WinSCP;

class Example
{
public static int Main()
{
try
{
// Setup session options
SessionOptions sessionOptions = new SessionOptions
{
Protocol = Protocol.Sftp,
HostName ="example.com",
UserName ="user",
Password ="mypassword",
SshHostKeyFingerprint ="ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"
};

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

// Upload files
TransferOptions transferOptions = new TransferOptions();
transferOptions.TransferMode = TransferMode.Binary;

TransferOperationResult transferResult;
transferResult = session.PutFiles(@"d:\toupload\*","/home/user/", false, transferOptions);

// Throw on any error
transferResult.Check();

// Print results
foreach (TransferEventArgs transfer in transferResult.Transfers)
{
Console.WriteLine("Upload of {0} succeeded", transfer.FileName);
}
}

return 0;
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e);
return 1;
}
}
}

在这里找到更多。