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Like any .NET API, WPF makes use of each member of the .NET type system (classes, structures, interfaces, delegates, enumerations) and each type member (properties, methods, events, constant data, read-only fields, etc.) within its implementation. However, WPF also supports a unique programming concept termed a dependency property.

n the previous chapter, you learned how .NET hides the low-level plumbing of web services, allowing you to create and consume sophisticated web services without needing to know anything about the low-level details of the protocols you re using. This higher-level abstraction is a general theme of modern programming for example, few Windows developers worry about the individual pixels in their business applications, and ASP.NET developers rarely need to write raw markup to the output stream. Of course, sometimes high-level frameworks aren t quite enough. For example, Windows developers creating real-time games just might need to work with low-level video hardware, and web developers creating custom controls will probably need to immerse themselves in a thorny tangle of JavaScript and HTML. The same principle is true of web services. In most cases, the high-level web services model in .NET is all you need. It ensures fast, productive, error-proof coding. Sometimes, however, you need to dig a little deeper. This is particularly true if you need to send complex objects to non-.NET clients or build extensions that plug into the .NET web services model. In this chapter, you ll take a look at this lower level, and learn more about the underlying SOAP and WSDL protocols.

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Note Dependency properties are also part of the Windows Workflow Foundation (WF) API. While a WF dependency property is constructed in a similar manner as a WPF dependency property, WF uses a different technology stack to implement them.

If you re a web service expert looking for new .NET 2.0 features, pay special attention to the Customizing SOAP Messages section toward the end of this chapter. It describes how to control the serialization process with IXmlSerializable and how to create schema importer extensions to allow types that web services wouldn t ordinarily support. Also, look for the Implementing an Existing Contract section that describes how to perform contract-first development with WSDL.

Like a normal .NET property (often termed a CLR property in the WPF literature), dependency properties can be set declaratively using XAML or programmatically within a code file. Furthermore, dependency properties (like CLR properties) ultimately exist to encapsulate data fields of a class and can be configured as read-only, write-only or read-write.

Now that we have our ButtonJoker custom component and our custom event ButtonMoveEvent, we can create the application file where we ll test the new custom component and handle the new custom ButtonMoveEvent. Let s create an application file called CustomEventTest.mxml and then add the ButtonJoker component, a TextArea, and the event handler function for the custom Event ButtonMoveEvent created previously. Our goal is to write a message containing the direction of the ButtonJoker once it has moved. Here s the code that does all this. < xml version="1.0" encoding="utf-8" > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:myComponents="*" layout="vertical" > <myComponents:ButtonJoker label="click me!" buttonMoveEvent="buttonMoveHandler(event)" /> <mx:TextArea text="{message}" /> <mx:Script> <![CDATA[ import mx.controls.Button;

Web services have developed rapidly, and standards such as SOAP and WSDL are still evolving. In early web service toolkits, different vendors interpreted parts of these standards in different ways, leading to interoperability headaches. Further, some features from the original standards are now considered obsolete. Negotiating these subtle differences is a small minefield, especially if you need to create web services that will be accessed by clients using other programming platforms and web service toolkits. Fortunately, another standard has appeared recently that sets out a broad range of rules and recommendations and is designed to guarantee interoperability across the web service implementations of different vendors. This document is the WS-Interoperability Basic Profile (see http://www.ws-i.org). It specifies a recommended subset of the full SOAP 1.1 and WSDL 1.1 specifications, and it lays out a few ground rules. WS-Interoperability is strongly backed by all web service vendors (including Microsoft, IBM, Sun, and Oracle).

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