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To properly support change notification requests, the view model or model class, if it represents a collection, should implement the INotifyCollectionChanged interface (in addition to the INotifyPropertyChanged interface). If the view model or model class defines a property that returns a reference to a collection, the collection class returned should implement the INotifyCollectionChanged interface. However, implementing the INotifyCollectionChanged interface can be challenging because it must provide notifications when items are added, removed, or changed within the collection. Instead of directly implementing the interface, it is often easier to use or derive from a collection class that already implements it. The ObservableCollection<T> class provides an implementation of this interface and is commonly used as either a base class or to implement properties that represent a collection of items. If you need to provide a collection to the view for data binding, and you do not need to track the user s selection or support filtering, sorting, or grouping of the items in the collection, you can simply define a property in your view model that returns a reference to the ObservableCollection<T> instance. The following example illustrates this approach.

eb services are a versatile tool; they enable you to perform system integration, execute business process workflow across boundaries, provide for business logic reuse, and much more. There are two primary ways to create services in Microsoft ASP.NET. You can create web services based on the classic ASP.NET XML web service (ASMX) model. This is a familiar ASP.NET programming experience for developers of services that are meant to be exclusively bound to Hypertext Transfer Protocol (HTTP) and hosted by Internet Information Services (IIS) and ASP.NET. You can also use Windows Communication Foundation (WCF) to create web services. This model allows developers to write services that can be configured to work with a variety of hosts, protocols, and clients. Of course, this includes hosting in IIS and communicating through HTTP. This chapter first covers creating HTTP handlers and modules, which includes responding to requests for specific file types such as PDF (Portable Document Format), XPS (XML Paper Specification), and similar types. It also includes creating modules that are called for specific application events across all requests to the server. Though they are not exactly web services, both HTTP handlers and modules are meant to respond to specialized HTTP requests. The chapter then moves on to cover programming actual web services. This includes Extensible Markup Language (XML) web services and those based on WCF (including WCF data services).

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Exam objectives in this chapter:

Create and configure HttpHandlers and HttpModules. Reference and configure ASMX and WCF services. Create and consume a data service.

Public-facing functions such as the Windows API or any other public-facing functionality exposed through a programming interface are good candidates for test automation. You can test the programming interface without writing automation. For example, I could test a large part of the core Windows API purely by running the Microsoft Office suite, but with automation targeted at the individual API functions I could use test applications to test multiple parameter combinations efficiently. Many facets of non-functional testing such as performance tests, load tests, stress tests, and leak tests are highly suitable for automation. (See 11, "Non-Functional Testing.") In fact, automated testing is the only way to execute many of the scenarios related to these types of testing situations. Simulating thousands of simultaneous connections to a service and timing an operation are tasks where automation is the only practical solution. When software testers think about test automation, many of them first think of user interface (UI) testing. The software test marketplace offers many tools that assist test writers in manipulating the user interface in their automated tests. A number of these tools also offer record and playback functionality so that the test author can simply record the manual test, and then play it back as an automated test. Record and playback tools often receive criticism because the tests they generate are not resistant to subtle changes in the user interface. User interface testing, in general, has this same problem, and it can be difficult to automate many UI elements. In practice at Microsoft, the primary methods used for automating UI bypass the presentation layer and use the underlying object model directly, or use similar methods to manipulate the core logic of the user interface. In a few cases, UI automation directly interacts with the UI by simulating mouse clicks and keystrokes.

Lessons in this chapter:

Lesson 1: Creating HTTP Handlers and HTTP Modules Lesson 2: Creating and Consuming XML Web Services Lesson 3: Creating and Consuming WCF Services

C# public class OrderViewModel : INotifyPropertyChanged { public OrderViewModel(IOrderService orderService) { this.LineItems = new ObservableCollection<OrderLineItem>( orderService.GetLineItemList()); } public ObservableCollection<OrderLineItem> LineItems { get; private set; } }

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To complete the lessons in this chapter, you should be familiar with developing applications with Microsoft Visual Studio 2010 by using Microsoft Visual Basic or Microsoft Visual C#. In addition, you should be comfortable with all of the following:

// C# code to start Microsoft Office Word, type text, select the text, and make the font bold // error checking removed for brevity Process wordApp = Process.Start("Winword.exe"); if (wordApp.WaitForInputIdle(1000)) { SendKeys.SendWait("This is input to WinWord"); SendKeys.SendWait("^a"); // send ctrl+a (select all text) SendKeys.SendWait("^b"); // send ctrl + b (make text bold) }

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