using System;

public class Program

{

    public static void Main()

    {

        var maintainer = new SqlDatabaseMaintainer("db");

        maintainer.Backup();

        maintainer.Restore("database-backup-20201016164152310.db");

        maintainer.Update(6);

        UpdateService updateService = new UpdateService();

        string result = updateService.Run("overload complete message");

        Console.WriteLine(result);

    }

}

​

public interface IMaintainer

{

    void Backup();

    void Restore(string dbFilePath);

    void Update(int targetVersion);

}

​

public class SqlDatabaseMaintainer : IMaintainer

{

    private string _fileExtension;

    public SqlDatabaseMaintainer(string fileExtension)

    {

        _fileExtension = fileExtension;

    }

​

    public void Backup()

    {

        string backupFileName = String.Format("database-backup-{0}.{1}", DateTime.Now.ToString("yyyyMMddHHmmssfff"), _fileExtension);

        Service service = new BackupService() { DatabaseFilePath = backupFileName };

        string backupResult = service.Run();

        Console.WriteLine(backupResult);

    }

    public void Restore(string dbFilePath)

    {

        Service service = new RestoreService() { DatabaseFilePath = dbFilePath };

        string restoreResult = service.Run();

        Console.WriteLine(restoreResult);

    }

    public void Update(int targetVersion)

    {

        Service service = new UpdateService() { TargetVersion = targetVersion };

        string updateResult = service.Run();

        Console.WriteLine(updateResult);

    }

}

​

public abstract class Service

{       

    public Service()

    {

        CompleteMessage = "Service Complete";

    }

​

    public string CompleteMessage { get; set; }

    public abstract string Run();

}

​

public class BackupService : Service

{

    public string DatabaseFilePath { get; set; }

    public override string Run()

    {

        return(String.Format("Database {0} Backed Up", DatabaseFilePath));

    }

}

​

public class RestoreService : Service

{

    public string DatabaseFilePath { get; set; }

​

    public override string Run()

    {

        return(String.Format("Database {0} Restored", DatabaseFilePath));

    }

}

​

public class UpdateService : Service

{

    public int TargetVersion { get; set; }

    public override string Run()

    {

        return(String.Format("Database Target Version {0} Schema Updated", TargetVersion));

    }

    public string Run(string completeMessage)

    {

        return String.Format("Update {0}", base.CompleteMessage);

    }

}