private HashSet<string> files = new HashSet<string>();

        private void FileCreated(object sender, FilePathEventArgs e)
        {
            try
            {
                if (files.Add(e.FilePath))
                   //aktion();
            }
            catch (Exception ex)
            {
//Test
            }

        }

 _fileSystemWatcher.Created += FileSystemWatcherOnCreated;

var watcher = new FileSystemWatcher("./");

Observable.FromEventPattern<FileSystemEventArgs>(watcher, "Changed")
            .Throttle(new TimeSpan(500000))
            .Subscribe(HandleChangeEvent);

watcher.EnableRaisingEvents = true;

        private static void watcher_Created(object sender, System.IO.FileSystemEventArgs e)
        {
            var time = File.GetCreationTimeUtc(e.FullPath);
            long offset = 504911232000000000;
            if (offset == time.Ticks) return;
            Console.WriteLine("Created " + e.Name);
        }

   HostFactory.Run(config =>
            {
                // Pass it to Topshelf
                config.UseSimpleInjector(_container);
                config.UseNLog();

                config.Service<Service>(s => //Service ist die Instanz
                {
                    s.ConstructUsingSimpleInjector();
                    s.WhenStarted((service, control) => service.Start(control));
                    s.WhenStopped((service, control) => service.Stop(control));
                });

                config.RunAsLocalSystem();                            

            });