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With the release of C# 3.0, Microsoft borrowed a number of features from the so-called family of functional programming languages. Among these features is the ability to define functions inline known to C# programmers by the intimidating term lambda expression. At a basic level, lambda expressions are simply functions that differ from normal C# functions in their syntax. In our example, x =>textBlock1.Text += String.Format(" OnNext: {0}", x) is a lambda expression that defines a function that accepts x as a parameter and infers its type from context. The textBlock1.Text += String.Format(" OnNext: {0}", x) statement is the body of the function. Note that the ()=> syntax specifies that no parameters are passed in to the lambda expression, as you saw with the last parameter to the Subscribe function.
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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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Figure 18 1. Reactive Extensions for .NET first steps In the foregoing code, notice how subscription does not implement the IObserver<T> interface. That is because the Microsoft.Phone.Reactive assembly contains a set of extension methods that overload the Subscribe() method of IObservable. These overloaded methods accept OnNext, OnError, and OnCompleted handlers defined by the IObserver<T> interface as lambda expressions, just as described in the previous paragraphs. Hence, in our experiments and samples with Rx.NET in this chapter, you will not have to physically implement the IObserver<T> interface. The output of your first Rx.NET application shown in Figure 18 1 is certainly nothing spectacular. But we are just barely touching the Rx.NET surface there. Imagine subscribing to events, such as keystrokes or data emitted by the location service. Then, imagine having the ability to react to those events only if certain conditions are met. For instance, filter out location values so that only when the location specifies a certain predefined area, the event is raised. In the next section, you will build a small application that uses this approach to make an asynchronous web service call to Flickr once the user has stopped typing text for half a second.
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Using Rx.NET Event Handling to Search for Flickr Photographs
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In this section, you will build an application that searches Flickr photos asynchronously using Rx.NET. In particular,you will learn how to create Observable data sources from events, as well as how to
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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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subscribe to them. The version of Flickr search you ll create is shown in Figure 18 2. The search technique is basic and uses a WebBrowser control to display images; however, this walkthrough will allow you to concentrate on learning the Rx.NET techniques for processing events on the Windows Phone 7. In the next walkthrough, you will build a Weather Service application that will demonstrate asynchronous programming with Rx.NET. Let s get started.
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Creating a Windows Phone Project
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First, create a new Windows Phone 7 project for the Flickr image search. 1. 2. Launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone Application project. Name it FlickrRx. Change the name of the application to Flickr Search, and change the page title to Rx at Work (to accomplish that, highlight the application name, press F4, edit the Text property, and then do the same for the page title). Add a reference (by right-clicking and selecting Add Reference) to Microsoft.Phone.Reactive and System.Observable assemblies.
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Figure 18 2. Flickr image search with Rx.NET
CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
Adding a User Interface
Now, add some user interface elements to the project. The user interface will consist of a text box, a label, and a WebBrowser control, as shown in Figure 18 3. 1. From the Toolbox, select a text box and drop it on the design surface. Rename the text box to txtSearchTerms. Make the width of the text box equal the width of the screen and clear the Text property. Next, select a textblock, drop it underneath the text box, rename it lblSearchingFor, and resize it to be the width of the screen. From the Toolbox, select the WebBrowser control and drop it on the design surface underneath the textblock. Rename the WebBrowser control webResults and make it the width of the screen.
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