A_Descricao.md

Estou usando Push Notifications e estou passando por um probema que ao tentar abrir um channel inexistente recebo uma exceção dizendo que o channel está aberto.

O primeiro método ListenShellToastNotification roda beleza, mas o segundo ListenShellTileNotification é onde ocorre a exceção.

A linha 96 o retorno é null, então ele entra no if para criar o channel, e quando tenta executar o open recebo uma InvalidOperationException cuja a mensagem diz que o channel já está aberto.

#DESCOBRI O PROBLEMA

O problema é que eu tentava abrir 2 canais diferentes "ToastSampleChannel" e "TileSampleChannel", quando na verdade só posso ter 1. Adicionei outro arquivo, o Funcionando.cs, que é o código certo!

Funcionando.cs

using System;
using System.Net;
using System.Text;
using System.Windows;
using MyApp.WindowsPhone7.Maping;
using MyApp.WindowsPhone7.ViewModel;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Notification;

namespace MyApp.WindowsPhone7
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            MapsCreator.CreateMaps();
            Loaded += MainLoaded;
        }

        private void MainLoaded(object sender, RoutedEventArgs e)
        {
            ListenNotification("SampleChannel");
        }

        private static void ListenNotification(string channelName)
        {
            // Try to find the push channel.
            HttpNotificationChannel pushChannel = HttpNotificationChannel.Find(channelName);

            // If the channel was not found, then create a new connection to the push service.
            if (pushChannel == null)
            {
                pushChannel = new HttpNotificationChannel(channelName);

                // Register for all the events before attempting to open the channel.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                // Register for this notification only if you need to receive the notifications while your application is running.
                pushChannel.ShellToastNotificationReceived += (o, args) => ShellToastNotificationReceived(args);

                pushChannel.Open();

                // Bind this new channel for toast events.
                pushChannel.BindToShellToast();
                pushChannel.BindToShellTile();
            }
            else
            {
                // The channel was already open, so just register for all the events.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                // Register for this notification only if you need to receive the notifications while your application is running.
                pushChannel.ShellToastNotificationReceived += (o, args) => ShellToastNotificationReceived(args);

                // Display the URI for testing purposes. Normally, the URI would be passed back to your web service at this point.
                System.Diagnostics.Debug.WriteLine(pushChannel.ChannelUri.ToString());
            }

            ChamaToast(pushChannel.ChannelUri.ToString());
            ChamaTile(pushChannel.ChannelUri.ToString());
        }

        private static void ChamaToast(string url)
        {
            System.Diagnostics.Debug.WriteLine("http://192.168.25.2/teste/Home/NotificaToast/?url=" + url);
            HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://192.168.25.2/teste/Home/NotificaToast/?url=" + url);

            httpWebRequest.BeginGetResponse(ar =>
            {
                httpWebRequest.EndGetResponse(ar);
                if (ar.IsCompleted)
                    System.Diagnostics.Debug.WriteLine("Foi Toast");
            }, null);
        }

        private static void ChamaTile(string url)
        {
            System.Diagnostics.Debug.WriteLine("http://192.168.25.2/teste/Home/NotificaTile/?url=" + url);
            HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://192.168.25.2/teste/Home/NotificaTile/?url=" + url);

            httpWebRequest.BeginGetResponse(ar =>
            {
                httpWebRequest.EndGetResponse(ar);
                if (ar.IsCompleted)
                    System.Diagnostics.Debug.WriteLine("Foi");
            }, null);
        }

        private static void ShellToastNotificationReceived(NotificationEventArgs args)
        {
            var message = new StringBuilder();
            string relativeUri = string.Empty;

            message.AppendFormat("Received Toast {0}:\n", DateTime.Now.ToShortTimeString());

            // Parse out the information that was part of the message.
            foreach (string key in args.Collection.Keys)
            {
                message.AppendFormat("{0}: {1}\n", key, args.Collection[key]);

                if (string.Compare(key, "wp:Param", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.CompareOptions.IgnoreCase) == 0)
                {
                    relativeUri = args.Collection[key];
                }
            }

            // Display a dialog of all the fields in the toast.
            System.Diagnostics.Debug.WriteLine(message.ToString());
        }

        private static void ErrorOccurred(NotificationChannelErrorEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine("A push notification {0} error occurred.  {1} ({2}) {3}", args.ErrorType, args.Message, args.ErrorCode, args.ErrorAdditionalData);
        }

        private static void ChannelUriUpdated(NotificationChannelUriEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine("Channel Uri is {0}", args.ChannelUri);
        }

        private void ApplicationBarIconButton_Click(object sender, EventArgs e)
        {
            NavigationService.Navigate(new Uri("/Sobre.xaml", UriKind.RelativeOrAbsolute));
        }

        private void ApplicationBarIconButton_Click_1(object sender, EventArgs e)
        {
            var mainViewModel = (MainViewModel)DataContext;
            mainViewModel.Logof();
        }
    }
}

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using MyApp.WindowsPhone7.Maping;
using MyApp.WindowsPhone7.ViewModel;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Notification;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace MyApp.WindowsPhone7
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            MapsCreator.CreateMaps();
            Loaded += MainLoaded;
        }

        private void MainLoaded(object sender, RoutedEventArgs e)
        {
            ListenShellToastNotification("ToastSampleChannel");
            ListenShellTileNotification("TileSampleChannel");
        }

        private static void ListenShellToastNotification(string channelName)
        {
            // Try to find the push channel.
            HttpNotificationChannel pushChannel = HttpNotificationChannel.Find(channelName);

            // If the channel was not found, then create a new connection to the push service.
            if (pushChannel == null)
            {
                pushChannel = new HttpNotificationChannel(channelName);

                // Register for all the events before attempting to open the channel.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                // Register for this notification only if you need to receive the notifications while your application is running.
                pushChannel.ShellToastNotificationReceived += (o, args) => ShellToastNotificationReceived(args);

                pushChannel.Open();

                // Bind this new channel for toast events.
                pushChannel.BindToShellToast();
            }
            else
            {
                // The channel was already open, so just register for all the events.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                // Register for this notification only if you need to receive the notifications while your application is running.
                pushChannel.ShellToastNotificationReceived += (o, args) => ShellToastNotificationReceived(args);

                // Display the URI for testing purposes. Normally, the URI would be passed back to your web service at this point.
                System.Diagnostics.Debug.WriteLine(pushChannel.ChannelUri.ToString());
            }

            HttpWebRequest httpWebRequest = null;
            do
            {
                System.Diagnostics.Debug.WriteLine("http://192.168.25.2/teste/Home/NotificaToast/?url=" + pushChannel.ChannelUri);
                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://192.168.25.2/teste/Home/NotificaToast/?url=" + pushChannel.ChannelUri);
            } while (pushChannel.ChannelUri == null);

            httpWebRequest.BeginGetResponse(ar =>
            {
                httpWebRequest.EndGetResponse(ar);
                if (ar.IsCompleted)
                    System.Diagnostics.Debug.WriteLine("Foi");
            }, null);
        }

        private static void ListenShellTileNotification(string channelName)
        {
            // Try to find the push channel.
            HttpNotificationChannel pushChannel = HttpNotificationChannel.Find(channelName);

            // If the channel was not found, then create a new connection to the push service.
            if (pushChannel == null)
            {
                pushChannel = new HttpNotificationChannel(channelName);

                // Register for all the events before attempting to open the channel.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                pushChannel.Open();

                // Bind this new channel for toast events.
                pushChannel.BindToShellTile();
            }
            else
            {
                // The channel was already open, so just register for all the events.
                pushChannel.ChannelUriUpdated += (o, args) => ChannelUriUpdated(args);
                pushChannel.ErrorOccurred += (o, args) => ErrorOccurred(args);

                // Display the URI for testing purposes. Normally, the URI would be passed back to your web service at this point.
                System.Diagnostics.Debug.WriteLine(pushChannel.ChannelUri.ToString());
            }

            HttpWebRequest httpWebRequest = null;
            do
            {
                System.Diagnostics.Debug.WriteLine("http://192.168.25.2/teste/Home/NotificaTile/?url=" + pushChannel.ChannelUri);
                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://192.168.25.2/teste/Home/NotificaTile/?url=" + pushChannel.ChannelUri);
            } while (pushChannel.ChannelUri == null);

            httpWebRequest.BeginGetResponse(ar =>
            {
                httpWebRequest.EndGetResponse(ar);
                if (ar.IsCompleted)
                    System.Diagnostics.Debug.WriteLine("Foi");
            }, null);
        }

        private static void ShellToastNotificationReceived(NotificationEventArgs args)
        {
            var message = new StringBuilder();
            string relativeUri = string.Empty;

            message.AppendFormat("Received Toast {0}:\n", DateTime.Now.ToShortTimeString());

            // Parse out the information that was part of the message.
            foreach (string key in args.Collection.Keys)
            {
                message.AppendFormat("{0}: {1}\n", key, args.Collection[key]);

                if (string.Compare(key, "wp:Param", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.CompareOptions.IgnoreCase) == 0)
                {
                    relativeUri = args.Collection[key];
                }
            }

            // Display a dialog of all the fields in the toast.
            System.Diagnostics.Debug.WriteLine(message.ToString());
        }

        private static void ErrorOccurred(NotificationChannelErrorEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine("A push notification {0} error occurred.  {1} ({2}) {3}", args.ErrorType, args.Message, args.ErrorCode, args.ErrorAdditionalData);
        }

        private static void ChannelUriUpdated(NotificationChannelUriEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine("Channel Uri is {0}", args.ChannelUri);
        }

        private void ApplicationBarIconButton_Click(object sender, EventArgs e)
        {
            NavigationService.Navigate(new Uri("/Sobre.xaml", UriKind.RelativeOrAbsolute));
        }

        private void ApplicationBarIconButton_Click_1(object sender, EventArgs e)
        {
            var mainViewModel = (MainViewModel)DataContext;
            mainViewModel.Logof();
        }
    }
}