Windows phone 7 '；System.NullReferenceException'；在Windows Phone 8.1中生成通道Uri时发生

每当我尝试在windows phone 7和windows phone 8中创建推送通知时，我的代码工作正常，但每当我尝试在windows phone 8.1上构建相同的代码时，它会显示“System.NullReferenceException”，即在windows phone 8.1中生成通道Uri时发生

代码如下：

            String channelUri="XYZ";
            HttpNotificationChannel myPushChannel = HttpNotificationChannel.Find(channelUri);
            if (null == myPushChannel)
            {

                    myPushChannel = new HttpNotificationChannel(channelUri);
                    myPushChannel.Open();
                    myPushChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(myPushChannel_ShellToastNotificationReceived);
                    myPushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(myPushChannel_ChannelUriUpdated);
                    myPushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(myPushChannel_ErrorOccurred);
                    myPushChannel.HttpNotificationReceived += new EventHandler<HttpNotificationEventArgs>(myPushChannel_HttpNotificationReceived);
                    myPushChannel.BindToShellTile();
                    myPushChannel.BindToShellToast();
                    uri = myPushChannel.ChannelUri;
            }
            else
            {

                if (myPushChannel != null)
                {
                    myPushChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(myPushChannel_ShellToastNotificationReceived);
                    myPushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(myPushChannel_ChannelUriUpdated);
                    myPushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(myPushChannel_ErrorOccurred);
                    myPushChannel.HttpNotificationReceived += new EventHandler<HttpNotificationEventArgs>(myPushChannel_HttpNotificationReceived);
                    uri = myPushChannel.ChannelUri;
                    if (!myPushChannel.IsShellToastBound)
                        myPushChannel.BindToShellToast();
                        if (!myPushChannel.IsShellTileBound)
                        myPushChannel.BindToShellTile();
                }

            }
        }

String channelUri=“XYZ”；
HttpNotificationChannel myPushChannel=HttpNotificationChannel.Find（channelUri）；
如果（null==myPushChannel）
{
myPushChannel=新的HttpNotificationChannel（channelUri）；
myPushChannel.Open（）；
myPushChannel.ShellToastNotificationReceived+=新事件处理程序（myPushChannel\u ShellToastNotificationReceived）；
myPushChannel.ChannelUriUpdated+=新事件处理程序（myPushChannel\u ChannelUriUpdated）；
myPushChannel.ErrorOccursed+=新事件处理程序（myPushChannel\u ErrorOccursed）；
myPushChannel.HttpNotificationReceived+=新事件处理程序（myPushChannel\u HttpNotificationReceived）；
myPushChannel.BindToShellTile（）；
myPushChannel.BindToShellToast（）；
uri=myPushChannel.ChannelUri；
}
其他的
{
如果（myPushChannel！=null）
{
myPushChannel.ShellToastNotificationReceived+=新事件处理程序（myPushChannel\u ShellToastNotificationReceived）；
myPushChannel.ChannelUriUpdated+=新事件处理程序（myPushChannel\u ChannelUriUpdated）；
myPushChannel.ErrorOccursed+=新事件处理程序（myPushChannel\u ErrorOccursed）；
myPushChannel.HttpNotificationReceived+=新事件处理程序（myPushChannel\u HttpNotificationReceived）；
uri=myPushChannel.ChannelUri；
如果（！myPushChannel.IsHelltoastBound）
myPushChannel.BindToShellToast（）；
如果（！myPushChannel.IsShellTileBound）
myPushChannel.BindToShellTile（）；
}
}
}

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在windows phone 7/8中一切正常，但在windows phone 8.1中不正常。

如果我们谈论的是WP8.1通用应用程序，而不是silverlight，您应该使用下面的行获取PushNotificationChannel：

PushNotificationChannel channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();

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可能重复投票，以作为重复投票再次结束。