protected sealed override void OnStart(string[] args)
{
OnStarting(args);
_host.Start();
OnStarted();
// Register callback for application stopping after we've
// started the service, because otherwise we might introduce unwanted
// race conditions.
_host
.Services
//.GetRequiredService<IHostApplicationLifetime>()
.GetRequiredService <IApplicationLifetime>()
.ApplicationStopping
.Register(() =>
{
if (!_stopRequestedByWindows)
{
Stop();
}
});
}