Question

是否有一种简单，快速的方法来检查FTP连接（包括主机，端口，用户名和密码）是否有效且有效？我正在使用C＃。谢谢。

Answer 1

尝试这样的事情：

        FtpWebRequest requestDir = (FtpWebRequest)FtpWebRequest.Create("ftp://ftp.google.com");
        requestDir.Credentials = new NetworkCredential("username", "password");
        try
        {
            WebResponse response = requestDir.GetResponse();
            //set your flag
        }
        catch
        {
        }

Answer 2

/ * HOLA Este es el metodo que utilizo si conoces uno mejor hasmelo saber Ubirajara 100％Mexicano isc.erthal@gmail.com * /

private bool isValidConnection(string url, string user, string password)
        {
            try
            {
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.Credentials = new NetworkCredential(user, password);
                request.GetResponse();
            }
            catch(WebException ex)
            {
                return false;
            }
            return true;
        }

Answer 3

您可以尝试使用 System.Net.FtpWebRequest然后只需检查GetResponseStream方法。

类似

System.Net.FtpWebRequest myFTP = new System.Net.FtpWebRequest

//Add your credentials and ports

try
{
    myFTP.GetResponseStream();
   //set some flags
}
catch ex
{
  //handle it when it is not working
}

Answer 4

使用System.Net.FtpWebRequest或System.Net.WebRequestMethods.Ftp使用您的登录凭据测试您的连接。如果FTP请求因任何原因失败，将返回相应的错误消息，指出问题是什么（身份验证，无法连接等等）

Answer 5

这可能有用。

  public async Task<bool> ConnectAsync(string host, string user, string password)
    {
        try
        {
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(host);
            request.Credentials = new NetworkCredential(user, password);
            request.UseBinary = true;
            request.UsePassive = true;
            request.KeepAlive = false; // useful when only to check the connection.
            request.Method = WebRequestMethods.Ftp.ListDirectory;
            FtpWebResponse response = (FtpWebResponse) await _ftpRequest.GetResponseAsync();
            return true;
        }
        catch (Exception)
        {
            return false;
        }            
    }

Answer 6

这是从msdn站点显示来自服务器的文件

public static bool DisplayFileFromServer(Uri serverUri)
{
// The serverUri parameter should start with the ftp:// scheme. 
if (serverUri.Scheme != Uri.UriSchemeFtp)
{
    return false;
}
// Get the object used to communicate with the server.
WebClient request = new WebClient();

// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com");
try 
{
    byte [] newFileData = request.DownloadData (serverUri.ToString());
    string fileString = System.Text.Encoding.UTF8.GetString(newFileData);
    Console.WriteLine(fileString);
}
catch (WebException e)
{
    Console.WriteLine(e.ToString());
}
return true;
}

如何检查FTP连接？

6 个答案: