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CHAPTER 17 PUSH NOTIFICATIONS
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Note how you defined two operations for the service to perform: Register new Windows Phone 7 clients for push notifications and Unregister them. Now it s time to add the implementation of the Register and Unregister methods. 5. Double-click the RegistrationService.cs file that Visual Studio added to your project. Make the RegistrationService.cs file look like the code here.
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public class RegistrationService : IRegistrationService { private static List<Uri> subscribers = new List<Uri>(); private static object obj = new object(); public void Register(string uri) { Uri channelUri = new Uri(uri, UriKind.Absolute); Subscribe(channelUri); } public void Unregister(string uri) { Uri channelUri = new Uri(uri, UriKind.Absolute); Unsubscribe(channelUri); } private void Subscribe(Uri channelUri) { lock (obj) { if (!subscribers.Exists((u) => u == channelUri)) { subscribers.Add(channelUri); } } } public static void Unsubscribe(Uri channelUri) { lock (obj) { subscribers.Remove(channelUri); } } public static List<Uri> GetSubscribers() { return subscribers; } } Take a look closer look at the code that you just added to the RegistrationService.cs file. Notice that the RegistrationService class implements the IRegistrationService interface on the very first line this is important! Aside from that, the code is pretty straightforward: a collection of push notification URIs is maintained in the static subscribers variable, and every client that calls the Register method of the service gets added to that list of subscribers. The lock function is used to prevent multiple
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clients changing the same data at the same exact moment in time, possibly resulting in incomplete and unpredictable data. In the beginning of this section, we said that a WCF service hosted by a Windows Forms application needs initialization code to start up. One of the places this initialization code can go is in the load event of Form1. 6. Here s the code you need to start up the service. Copy it to the load event of Form1 here: ServiceHost host; host = new ServiceHost(typeof(RegistrationService)); host.Open(); You are almost done now you need only to provide some configuration parameters for the WCF service to run. 7. Open the app.config file and add the following configuration parameters to the <system.ServiceModel> element (you should already have configuration settings defined within <system.ServiceModel>, but now you need to make sure those settings match precisely what is pasted here):
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<system.serviceModel> <behaviors> <endpointBehaviors> <behavior name="EndpointPNServerServiceBehavior"> <webHttp /> </behavior> </endpointBehaviors> <serviceBehaviors> <behavior name=""> <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> </serviceBehaviors> </behaviors> <services> <service name="PNServer.RegistrationService"> <endpoint address="http://localhost/RegistrationService" behaviorConfiguration="EndpointPNServerServiceBehavior" binding="webHttpBinding" contract="WP7_Push_Notifications.IRegistrationService"> </endpoint> </service> </services> </system.serviceModel> In a nutshell, with these settings you have configured your service to listen at the following address: http://localhost/RegistrationService. You have also specified that the requests to this service will be coming over the http protocol. Finally, you will modify the main application form (Form1) and add a Broadcast button that will send a push notification to all subscribed clients. Once clicked, the button click handler will get a list of all clients subscribed and send each one of them a push notification (toast notification in the following code). Here s how to do that. 8. Open Form1.cs in Design view and add a button to that form underneath the Send Notification button.
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Change the button s text to Broadcast, as shown in Figure 17 10. Change the button s name to btnBroadcast, double-click it, and make sure that the button s Click event contains the following code:
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private void btnBroadcast_Click(object sender, EventArgs e) { if (txtTitle.Text == string.Empty || txtText.Text == string.Empty) { MessageBox.Show("Please enter text and title to send"); return; } List<Uri> allSubscribersUri = RegistrationService.GetSubscribers(); foreach (Uri subscriberUri in allSubscribersUri) { sendPushNotificationToClient(subscriberUri.ToString()); } }
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Figure 17 9. To add RESTful WCF service to the Windows Forms application, set the application s target framework to .NET Framework 4.
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