Windows Phone 8.1语音识别+ NavigationService问题

Question

I'm developing an application for Windows Phone 8.1 using Speech recognition. At this moment, I want navigate in the application using voice commands. The application has a button to active the voice recognition.

My problem at this moment is in NavigationService.Navigate. When I press the button, the application recognize my voice speech (like "Settings") but throws an exception in the NavigationService.

This happens when I run the application in my device (Nokia lumia 735). When I use the emulator (8.1 wvga 4inch 512mb), the application works nice and the NavigationService works very well!

This app is a part of a school project, so I will be very glad if anyone can help me with it.

This is my code at this moment:

The button click code:

private async void btSpeak_Click(object sender, RoutedEventArgs e)
        {
            recoWithUI = new SpeechRecognizerUI();


            // Query for a recognizer that recognizes French as spoken in France.
            IEnumerable<SpeechRecognizerInformation> language = from recognizerInfo in InstalledSpeechRecognizers.All
                                                                         where recognizerInfo.Language == "en-US"
                                                                         select recognizerInfo;

            // Set the recognizer to the top entry in the query result.
            recoWithUI.Recognizer.SetRecognizer(language.ElementAt(0));

            // Build a string array, create a grammar from it, and add it to the speech recognizer's grammar set.
            string[] triviaCategories = { "activity tracker", "bmi caculator", "meal calculator", "nutrition chart", "settings" };
            recoWithUI.Recognizer.Grammars.AddGrammarFromList("categories", triviaCategories);

            // Display text to prompt the user's input.
            recoWithUI.Settings.ListenText = "Say an option: ";

            // Display an example of ideal expected input.
            recoWithUI.Settings.ExampleText = "Activity Tracker\n @BMI Calculator\n Meal Calculator\n Nutrition Chart\n Settings";

            // Deactivate the readout of recognized text to the user.
            recoWithUI.Settings.ReadoutEnabled = true;

            // Load the grammar set and start recognition.
            SpeechRecognitionUIResult result = await recoWithUI.RecognizeWithUIAsync();

            //  Handle the caputed voice
            if (!String.IsNullOrWhiteSpace(result.RecognitionResult.Text))
            {
                recoWithUI.Dispose();
                VoiceComandsRecognition(result.RecognitionResult.Text.ToString());
            }
            else
                return;

        }

and the code for the method that handles the recognized string:

public void VoiceComandsRecognition(string CapturedVoice)
        {
            try
            {
                switch (CapturedVoice)
                {
                    case "activity tracker":
                        NavigationService.Navigate(new Uri("/Pages/ActivityTracker.xaml", UriKind.Relative));
                        break;
                    case "bmi calculator":
                        NavigationService.Navigate(new Uri("/Pages/BMIcalculator.xaml", UriKind.Relative));
                        break;
                    case "meal calculator":
                        NavigationService.Navigate(new Uri("/Pages/MealCalculator.xaml", UriKind.Relative));
                        break;
                    case "nutrition chart":
                        NavigationService.Navigate(new Uri("/Pages/NutritionChart.xaml", UriKind.Relative));
                        break;
                    case "settings":
                         NavigationService.Navigate(new Uri("/WinHealth;component/Pages/SettingsPage.xaml", UriKind.RelativeOrAbsolute));
                         break;
                }
            }
            catch (Exception e)
            {
                MessageBox.Show("Erro ao reconhecer o comando. "+e.ToString());
            }
    }

this is the exception:

{System.Exception: Error HRESULT E_FAIL has been returned from a call to a COM component. at MS.Internal.XcpImports.CheckHResult(UInt32 hr) at MS.Internal.XcpImports.SetValue(IManagedPeerBase obj, DependencyProperty property, String s) at MS.Internal.XcpImports.SetValue(IManagedPeerBase doh, DependencyProperty property, Object obj) at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value) at System.Windows.DependencyObject.SetEffectiveValue(DependencyProperty property, EffectiveValueEntry& newEntry, Object newValue) at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation) at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet) at Microsoft.Phone.Controls.PhoneApplicationFrame.UpdateMargin(Thickness region, PageOrientation orientation) at Microsoft.Phone.Controls.PhoneApplicationFrame.OnVisibleRegionChange(Object sender, VisibleRegionChangeEventArgs args) at Microsoft.P hone.Controls.PhoneApplicationFrame.System.Windows.Controls.IFrame.InternalOnVisibleRegionChange(Object sender, VisibleRegionChangeEventArgs args) at System.EventHandler 1.Invoke(Object sender, TEventArgs e) at System.Windows.Controls.Frame.FireEventHandler[T](EventHandler 1 handler, Object sender, T args) at Microsoft.Phone.Controls.PhoneApplicationPage.set_VisibleRegionInPhysicalPixels(RECT value) at Microsoft.Phone.Controls.PhoneApplicationPage.UpdateCurrentVisualState() at Microsoft.Phone.Controls.PhoneApplicationFrame.InternalUpdateOrientationAndMarginForPage(PhoneApplicationPage visiblePage) at Microsoft.Phone.Controls.PhoneApplicationFrame.System.Windows.Controls.IFrame.InternalUpdateOrientationAndMarginForPage(IPhoneApplicationPage visiblePage) at System.Windows.Navigation.NavigationService.CompleteNavigation(DependencyObject content, NavigationMode mode) at System.Windows.Navigation.NavigationService.ContentLoader_BeginLoad_Callback(IAsyncResult result)}

Answer 1

This is a confirmed Bug in Windows Phone. Microsoft will fix it in 6-12 months they have told me.