public partial class WinServiceTransfer : ServiceBase
    {
        internal static ServiceHost myServiceHost = null; 

        public WinServiceTransfer()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            if (myServiceHost != null)
            {
                myServiceHost.Close();
            }
            myServiceHost = new ServiceHost(typeof(WinServiceTransfer)); //<<<< Должно было быть WcfServiceTransfer
            try
            {
                myServiceHost.Open();
            }
            catch (Exception ex)
            {

                StreamWriter log = new StreamWriter("Service_log.txt");
                log.WriteLine(ex.Message);
                log.Close();
            }
            
        }