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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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Implementing the Observer Pattern with Rx.NET
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Before you create an application that asynchronously searches photos on Flickr, we will take a short detour to understand the basics of Rx.NET. In the project that follows, you will generate a simple Observable collection using Reactive Extensions for .NET and read values from this collection as they are pushed down to us. Follow these step-by-step instructions.
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Creating a Windows Phone Project
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First, you will create a new Windows Phone 7 project and add framework elements necessary to make it work on the mobile platform. 1. Launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone Application project. Name it RxSample.
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In this project, you will observe the messages generated by the Reactive Extensions framework in the text box on the phone screen. 2. From the Toolbox, select the textblock and drop it on the design surface. Since you are just getting your feet wet with Rx.NET, leave the name of the textblock (textBlock1) unchanged for now and adjust its width and width to occupy the full area of the screen. Highlight the textblock, press F4 to bring up its Properties window, and set the TextWrapping property to Wrap.
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On Windows Phone 7, the Rx.Net implementation is contained within two separate assemblies Microsoft.Phone.Reactive and System.Observable. 3. Add a Reference to Microsoft.Phone.Reactive and System.Observable assemblies, by right-clicking and selecting Add Reference.
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Adding Code to Create and Read Observable Collections
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You will now add code to create an Observable collection, subscribe to it, and read values from it. 1. Import the Rx.NET libraries to current code. To do that, open MainPage.xaml.cs (right-click MainPage.xaml and select View Code) and add the following statement to the top of the page: using Microsoft.Phone.Reactive; Remember how an Observable collection performs the role of the Subject in the Observer pattern. In Rx.NET, the IObservable<T> interface acts as that Subject. You will now create an Observable collection that will consist of a range of integer values. 2. In the MainPage() constructor, add the following code right after the InitializeComponent() statement: IObservable<int> source = Observable.Range(5, 3); Notice the use of the Observable.Range method to create an Observable collection that will consist of a range of integers from 5 to 7 inclusive.
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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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You will now create an Observer for the source Subject created in Step 2. This Observer object will be notified of any changes to the source in this case, every time a new integer is generated, or pushed down to the application. 3. Add the following code to create the Observer: IDisposable subscription = source.Subscribe(x => textBlock1.Text += String.Format(" OnNext: {0}", x), ex => textBlock1.Text += String.Format(" OnError: {0}", ex.Message), () => textBlock1.Text += " OnCompleted"); The Subscribe method of IObservable<T> has several overloads; the one that you just used accepts three lambda expressions (see sidebar, Lambda Expressions ) as its parameters: the first lamda expression contains the logic to invoke when another element becomes available to the Observer (OnNext), the second has logic to invoke if there is an exception in the Observer (OnError), and the last one contains logic that gets executed when the Subject completes its useful life (OnComplete). The completion of useful life condition varies from Subject to Subject, but generally means that there are no more elements to receive from the Subject. If you are not familiar with lamda expressions, the sidebar contains a brief introduction to this newer feature of the .NET framework.
Finally, tell the Observer to discontinue its interest in the Subject s state by issuing a Dispose() method: subscription.Dispose();
Press F5 to run the application. The Windows Phone 7 emulator screen will appear, showing messages OnNext: 5, OnNext: 6, OnNext: 7, and OnComplete, as shown in Figure 18 1. The Observable object generated three integer values, pushed them down to Observers, and called it quits.
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