Beginning Web Development, Silverlight, and ASP.NET AJAX

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356 CHAPTER 15 ■ ENHANCING THE WEB EXPERIENCE WITH SILVERLIGHT of Silverlight 2.0 are available (they are called 1.1 in the downloads, but Microsoft plans to update them to a 2.0 early beta in spring 2008), and these enhance the programming model with a new, mini version of the .NET CLR, allowing applications to be built and coded using C# or other .NET languages. Silverlight 2.0 also includes these enhancements: • The ability to run programs written with multiple programming languages has been added. In addition to JavaScript, the new mini CLR allows C# and Visual Basic to be used in building applications. • The inclusion of a high-performance runtime has been included. Having your application logic compiled into .NET code can lead to drastic improvements in performance. For example, Microsoft has built a sample chess algorithm that does a look-ahead for chess moves, constrained to 1 second. You can play this game on www.silverlight.net. You will be able to see that the performance of the C# version (measured in the number of moves it can evaluate in 1 second) is generally 1,000 to 1,500 times faster than the JavaScript version. While this isn’t a conclusive benchmark, it is certainly indicative of the improvements in performance. • Extensibility to XAML has been added in version 1.1. Now you can create your own XAML controls to improve the overall experience. • New XAML UI controls for application development have been added. • Networking via the System.NET libraries has been added. Thus, Silverlight applications will be able to directly consume network resources in the services tier of a multitier application. • Data enhancements such as LINQ are available. • Cross-platform debugging is available, so an application running on Mac OS X will be debuggable from Visual Studio running on a Windows PC. While these features are very compelling, at the time of writing this book, they are in a very early stage, and this book will focus only on Silverlight 1.0. The Anatomy of a Silverlight Application As Silverlight is a browser plug-in, using it could be as simple as using an tag in HTML that refers to the plug-in, and defining a set of tags to configure it. So, you could easily add a Silverlight plug-in to your page like this:
CHAPTER 15 ■ ENHANCING THE WEB EXPERIENCE WITH SILVERLIGHT 357 However, if you do this, you will be making life unnecessarily difficult for yourself, as you will have to manage the location of the XAML, manage the downloading and licensing of the component, and so on. Instead, the Silverlight SDK provides tools that make the process a lot easier, and that provide a de facto standard methodology of using Silverlight on your site. In the rest of this section, you’ll look at all the pieces that you would use to build any Silverlight application, from a simple Hello World application to a full-featured web experience. Using Silverlight.js Microsoft provides the file Silverlight.js as part of the Silverlight SDK. This file contains everything that you need to instantiate and use the Silverlight plug-in on your page. It manages what to do with different browser versions, and provides a download location and terms-of-service and license information to the end user, making the download process safe, secure, and easy. As Silverlight is a browser plug-in, it is hosted in an HTML page, and your page should have a script reference to this JavaScript file. This will look something like this: The Silverlight SDK can be downloaded from the Microsoft Silverlight site, at http://silverlight.net/GetStarted/. You’ll see in a moment how this JavaScript library is used to create a Silverlight application—but first, let’s look at the XAML that it will render. Using XAML You saw XAML earlier in this book as a markup language for WPF. Silverlight uses a subset of this language. This sample contains a XAML Canvas, the basic drawing block and container in Silverlight, which in turn contains a TextBlock, which is used for rendering text. This text is a simple “Hello World!” message.
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The EXPERT’s VOIce ® in .NET Beg
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Beginning Web Development, Silverli
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Contents About the Author . . . . .
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■CONTENTS ix ■CHAPTER 5 ASP.NET
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■CONTENTS xi ■CHAPTER 11 Ajax A
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■CONTENTS xiii ■CHAPTER 15 Enha
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About the Author ■LAURENCE MORONE
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Introduction This book is aimed at
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PART 1 Building Web Applications
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4 CHAPTER 1 ■ INTRODUCTION TO WEB
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10 CHAPTER 2 ■ BASICS OF WEB DEVE
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38 CHAPTER 3 ■ WEB FORMS WITH ASP
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CHAPTER 4 Data Binding with ASP.NET
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CHAPTER 4 ■ DATA BINDING WITH ASP
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CHAPTER 6 Deploying Your Web Site I
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CHAPTER 6 ■ DEPLOYING YOUR WEB SI
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CHAPTER 7 .NET 3.0: Windows Communi
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CHAPTER 7 ■ .NET 3.0: WINDOWS COM
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CHAPTER 8 .NET 3.0: Windows Present
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CHAPTER 8 ■ .NET 3.0: WINDOWS PRE
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CHAPTER 9 .NET 3.0: Windows Workflo
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CHAPTER 9 ■ .NET 3.0: WINDOWS WOR
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234 CHAPTER 10 ■ .NET 3.0: PROGRA
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CHAPTER 11 Ajax Applications and Em
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CHAPTER 11 ■ AJAX APPLICATIONS AN
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CHAPTER 12 AJAX Extensions for ASP.
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CHAPTER 12 ■ AJAX EXTENSIONS FOR
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416 ■INDEX applications. See also
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Beginning Web Development, Silverlight, and ASP.NET AJAX

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