protected override async void OnAppearing() { if (facebookId == string.Empty & accessToken == string.Empty) { await Navigation.PushAsync(new Login()); } else { var favorService = new FavorService(); var id = favorService.CleanId(conversationId); var messages = await favorService.GetMessagesAsync(id); foreach (var message in messages) { conversationMessages.Add(message); } ConversationList.ItemsSource = conversationMessages; base.OnAppearing(); } }