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CHAPTER 17 PUSH NOTIFICATIONS
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Figure 17 3. Basic push notifications architecture
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The Push Notification Framework
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The namespace whose APIs do the push notification heavy lifting is Microsoft.Phone.Notification, and the HttpChannelNotification is its workhorse. Before a notification of any type can be sent, a notification channel must be created. The HttpChannelNotification class allows developers to create a new channel or find an existing (previously created) one using its Open and Find methods correspondingly. When programming push notifications, it is a good practice to check whether the channel has been previously created using the Find operation. You will see how this is done shortly in several upcoming walkthroughs. An important note about the Open method: once the channel is open, it is not immediately active. The push notification channel becomes active once it acquires the push notification URI from the MPNS. This URI is acquired in an asynchronous manner, as you will also see in the walkthroughs for this chapter. Other important methods of the HttpChannelNotification class include BindToShellToast and BindToShellTile. These methods are responsible for associating, or binding, a particular HttpChannelNotification channel instance to toast and tile notifications. These methods have corresponding UnbindToShellToast and UnbindToShellTile methods that disassociate toast and tiles subscriptions correspondingly from a given channel. Finally, the Close method of the HttpChannelNotification class closes the channel and removes all the subscriptions associated with that channel. Push notifications are most appropriate in situations where Windows Phone 7 applications almost fully depend on the data supplied by the server on the web or somewhere else in the cloud. As such, to demonstrate push notifications in action, you must create two separate projects: one project will be a Windows Phone 7 application, and the other project could be either a web-based application, a web service, or, for the purposes of keeping the current example simple, a Windows Forms application. To create a Windows Forms application that will be used as part of the next walkthrough, you will be using a version of Visual Studio that allows the creation of Windows Forms applications Visual C# 2010 Express. Alternately, you could use other (paid) editions of Visual Studio 2010 to create Windows Forms applications.
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CHAPTER 17 PUSH NOTIFICATIONS
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Implementing Toast Notifications
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For the toast notifications walkthrough, you will implement a Windows Phone 7 client application that will create a notification channel, and a Windows Forms application that can send the notifications to the Windows Phone 7 application via that channel. The Windows Phone 7 client application will be a single screen application with one button and one text box, as shown in Figure 17 4. The Windows Forms application will consist of the single form shown in Figure 17 5. You will follow this order of program implementation: 1. You will create the Windows Phone 7 Notification client application. This application will establish a notification channel and print the URI of that communication channel into the Output window. Create and execute the Windows Forms application that will send notifications. You will take the URI of the notification channel that you established in Step 1, paste it into the Push Notifications URL field of this application, and submit the notification. Verify that you are able to receive toast notifications in the Windows Phone 7 application.
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Creating a Client Application
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The Windows Phone 7 Notification client application will consist of a command button that will create a push notification channel and print its URI into the Debug window. You will also add a text box to the application to display the URI for visual confirmation. Follow these steps to create the application. 1. 2. Launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone Application project. Name it PNClient. From the Toolbox, drag and drop a text box on the design surface. Rename the text box to txtURI, adjust its width to be the full width of the screen, and adjust its height to be about a quarter of the screen s height. Set the text box s TextWrapping property to Wrap and clear out its Text property. From the Toolbox, drag and drop a button on the design surface. Rename the button to btnCreateChannel and set the Content property to Create Channel. Your Windows Phone 7 design surface should now look like Figure 17 6. Add the following using directives to the top of the MainPage.xaml.cs file.
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using Microsoft.Phone.Notification; using System.Diagnostics; 5. You need to add code that will capture the URI of the notification channel in the Output window. At the top of the code page, right underneath the public partial class MainPage : PhoneApplicationPage { add the following code: Uri channelUri; public Uri ChannelUri { get { return channelUri; }
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