protected async override void OnNavigatedTo(NavigationEventArgs e) { base.OnNavigatedTo(e); VisualStateManager.GoToState(this, "InitializingPhoto", false); viewModel = (MainPageViewModel)DataContext; RegisterOrientationEventHandlers(); var token = App.Settings.Values["Token"].ToString(); HttpClient hc = new HttpClient(); hc.DefaultRequestHeaders.Add("Authorization", "Bearer " + token); var result = await hc.GetAsync("https://graph.microsoft.com/v1.0/me"); if (result.IsSuccessStatusCode) { string res = await result.Content.ReadAsStringAsync(); OfficeUser user = JsonConvert.DeserializeObject <OfficeUser>(res); ((MainPageViewModel)DataContext).UserName = user.displayName; viewModel.OxfordStatus = "Checking if we know you..."; bool userRegistered = await checkUserRegistrationAsync(); if (!userRegistered) { viewModel.OxfordStatus = "Looks like we haven't seen you yet. \nNo problem, take some pictures of your face. Five should be enough."; } else { viewModel.OxfordStatus = "Welcome back!"; var ud = FaceApiService.DeserializeUserData(currentPerson.userData); ud.AccessToken = token; currentPerson.userData = FaceApiService.SerializeUserData(ud); await FaceApiService.UpdatePersonAsync(personGroupId, currentPerson); } } await InitializeCameraAsync(); await CreateFaceDetectionEffectAsync(); }