using System;

using System.IO;

using Renci.SshNet;

using System.Threading;

​

class Program

{

    static void Main(string[] args)

    {

        int maxRetries = 3; // Maximum number of retry attempts

        int retryDelay = 2000; // Delay between retries in milliseconds

​

        Console.WriteLine("Create client Object");

        using (SftpClient sftpClient = new SftpClient(getSftpConnection("host", "userName", 22, "filePath")))

        {

            bool isConnected = false;

            int attempt = 0;

​

            while (!isConnected && attempt < maxRetries)

            {

                try

                {

                    attempt++;

                    Console.WriteLine($"Attempt {attempt} to connect to server");

                    sftpClient.Connect();

                    isConnected = true;

                    Console.WriteLine("Connected to server");

​

                    Console.WriteLine("Creating FileStream object to stream a file");

                    using (FileStream fs = new FileStream("filePath", FileMode.Open))

                    {

                        sftpClient.BufferSize = 1024;

                        sftpClient.UploadFile(fs, Path.GetFileName("filePath"));

                    }

                }

                catch (Exception ex)

                {

                    Console.WriteLine($"An error occurred on attempt {attempt}: {ex.Message}");

                    if (attempt < maxRetries)

                    {

                        Console.WriteLine($"Retrying in {retryDelay / 1000} seconds...");

                        Thread.Sleep(retryDelay);

                    }

                    else

                    {

                        Console.WriteLine("Max retry attempts reached. Exiting.");

                        // Handle failure to connect, e.g., logging or notifying the user

                    }

                }

            }

        }

    }

​

    public static ConnectionInfo getSftpConnection(string host, string username, int port, string publicKeyPath)

    {

        return new ConnectionInfo(host, port, username, privateKeyObject(username, publicKeyPath));

    }

​

    private static AuthenticationMethod[] privateKeyObject(string username, string publicKeyPath)

    {

        PrivateKeyFile privateKeyFile = new PrivateKeyFile(publicKeyPath);

        PrivateKeyAuthenticationMethod privateKeyAuthenticationMethod = new PrivateKeyAuthenticationMethod(username, privateKeyFile);

        return new AuthenticationMethod[] { privateKeyAuthenticationMethod };

    }

}