ApiAiDemo.MainPage.OnNavigatedFrom C# (CSharp) Метод

        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            base.OnNavigatedFrom(e);
            
            AIService.OnListeningStarted -= AIService_OnListeningStarted;
            AIService.OnListeningStopped -= AIService_OnListeningStopped;

            speechSynthesizer?.Dispose();
            speechSynthesizer = null;
        }