silver light 123
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ABSTRACT
Microsoft Silver light is a web browser plugin that provides support for rich internet applications such as animation, vector
graphics and audio-video playback. Silverlight competes with products such as Adobe Flash, Adobe Flex, Adobe Shockwave,
JavaFX, and Apple QuickTime. Now in beta-testing, version 2.0 brings improved interactivity and support for .NET languages and
development tools. Silverlight was developed under the codename Windows Presentation Foundation/ Everywhere (WPF/E). It is
compatible with multiple web browser products used on Microsoft Windows and Mac OS X operating systems. Mobile devices,
starting with Windows Mobile 6 and Symbian (Series 60) phones, will also be supported. A third-party free software implementation
named Moonlight is under development to bring compatible functionality to GNU/Linux. Silverlight provides a retained mode
graphics system, similar to WPF and integrates multimedia, graphics, animations and interactivity into a single runtime. It is being
designed to work in concert with XAML and is scriptable with JavaScript. XAML can be used for marking up the vector graphics and
animations. Textual content created with Silverlight would be more searchable and indexable than that created with Flash as it is not
compiled, but represented as text (XAML). Silverlight can also be used to create Windows Sidebar gadgets for Windows Vista.
Silverlight supports playback of WMV, WMA and MP3 media content across all supported browsers without requiring Windows
Media Player, the Windows Media Player ActiveX control or Windows Media browser plugins. Because Windows Media Video 9 is
an implementation of the SMPTE VC-1 standard, Silverlight also supports VC-1 video, though still only in an ASF file format.
Furthermore, the Software license agreement says VC-1 is only licensed for the "personal and non-commercial use of a consumer".
Silverlight does not support playback of H.264 video. Silverlight makes it possible to dynamically load XML content that can be
manipulated through a DOM interface, a technique that is consistent with conventional Ajax techniques. Silverlight exposes a
Downloader object which can be used to download content, like scripts, media assets or other data, as may be required by the
application. With version 2.0, the programming logic can be written in any .NET language, including some common dynamic
programming languages like Ruby and Python. A Silverlight application being edited in Microsoft Visual Studio.Silverlight
applications can be written in any .NET programming language. As such, any development tools which can be used with .NET
languages can work with Silverlight, provided they can target the Silverlight CoreCLR for hosting the application, instead of the .NET
Framework CLR. Microsoft has positioned Microsoft Expression Blend versions 2.0 and 2.5 for designing the UI of Silverlight 1.0
and 2 applications respectively. Visual Studio 2008 can be used to develop and debug Silverlight applications. To create Silverlight
projects and let the compiler target CoreCLR, Visual Studio 2008 requires the Silverlight Tools for Visual Studio which is available
as a beta release.
1. INTRODUCTION
1.1 OVERVIEW
Microsoft silverlight is a programmable web browser plug in that enables features such as animation, vector graphics and audio-video
playback that characterize rich internet applications. Silverlight competes with products such as Adobe Flash, Adobe Flex, Adobe
Shockwave, Gears (software), and JavaFX. Version 2.0, now in beta-testing, brings improved interactivity and support for .NET
languages and development tools. Silverlight was developed under the codename Windows Presentation Foundation/Everywhere
(WPF/E). It is compatible with multiple web browser products used on Microsoft Windows and Mac OS X operating systems. Mobile
devices, starting with Windows Mobile 6 and Symbian (Series 60) phones, will also be supported. A third-party free software
implementation named Moonlight is under development to bring compatible functionality to GNU/Linux.1.2 RELEASES
Silverlight 1.0 consists of the core presentation framework, which is responsible for UI, interactivity and user input, basic UI controls,
graphics and animation, media playback, DRM support, and DOM integration. It is made up of the following components:
Input handling input from devices like keyboard, mouse, stylus etc.
UI core managing rendering of bitmap images (including compressed raster
images like JPEG), vector graphics, text and animations.
Media playback of MP3, WMA Standard, WMV7, WMV8 and WMV9/VC-
1 streams.
XAML to allow the UI layout to be created using XAML markup language.
Silverlight 2 (previously referred to as version 1.1)
includes a version
[of the .NET Framework, implementing the same full Common Language Runtime version as .NET Framework 3.0; so it can execute
any .NET language including VB.NET and C# code. Unlike the CLR included with .NET Framework, multiple instances of the
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CoreCLR included in Silverlight can be hosted in one process. With [ this, the XAML layout markup file (.xaml file) can be
augmented by code-behind code, written in any .NET language, which contains the programming logic. It can be used to
programmatically manipulate both the Silverlight application and the HTML page which hosts the Silverlight control. The XAML
markup as well as the code, is compiled into .NET assemblies which are then compressed using ZIP and stored in a.xap file.
Silverlight ships with a lightweight class library which features, among others, extensible controls, XML Web Services, networking
components and LINQ APIs. This class library is a subset of and is considerably smaller than .NET Framework's Base Class Library.
Silverlight code runs in a sandbox which prevents invoking platform APIs.Silverlight 2 also adds support for adaptive streaming of
media files (which allows Silverlight to choose the bit rate of the media based on available andwidth) as well as Windows Media
DRM and PlayReady DRM in media [ files. Silverlight 2 includes Deep Zoom, a technology derived from Microsoft Live Labs
Photosynth. It allows users to zoom into or out of an image (or a collage of images), with smooth transitions, using the mouse wheel.
The images can [ scale from 2 or 3 megapixels in resolution to gig pixel range, but the user need not wait for it to be downloaded
entirely; rather Silverlight downloads only the parts in view, optimized for the zoom level being viewed. Beta 2 onwards, Deep Zoom
uses.an XML-based file format SilverLight
2. SILVERLIGHT
2.1 WHAT IS SILVERLIGHT
Silverlight is a new Web presentation technology that is created to run on a variety of platforms. It enables the creation of rich,
visually stunning and interactive experiences that can run everywhere: within browsers and on multiple devices and desktop operating
systems (such as the Apple Macintosh). In consistency with WPF (Windows Presentation Foundation), the presentation technology in
Microsoft .NET Framework 3.0 (the Windows programming infrastructure), XAML (extensible Application Markup Language) is the
foundation of the Silverlight presentation capability. Silverlight enables you to create a state-of-the-art application that has the
following features:
It is a cross-browser, cross-platform technology. It runs in all popular Web
browsers, including Microsoft Internet Explorer, Mozilla Firefox, and Apple Safari, and on Microsoft Windows and Apple Mac OS
X. It provides a consistent experience no matter where it runs.
It is supported by a very small download that installs in seconds.
It streams video and audio. It scales video quality to everything from mobile
devices to desktop browsers to 720p HDTV video modes.
It includes compelling graphics that users can manipulatedrag, turn, and
zoom directly in the browser.
It reads data and updates the display, but it doesn't interrupt the user by
refreshing the whole page.
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fig: 2.1 Silverlight-based application with rich graphics and user interaction Web developers and graphics designers can create
Silverlight-based applications in a variety of ways. You can use Silverlight markup to create media and graphics, and manipulate
them with dynamic languages and managed code. Silverlight also enables you to use professional-quality tools like Visual Studio for
coding and Microsoft Expression Blend for layout and graphic design.
2.1.1 FEATURES
Silverlight combines multiple technologies into a single development platform that enables you to select the right tools and the right
programming language for your needs. Silverlight offers you the following features: WPF and XAML. Silverlight includes Windows
Presentation Foundation (WPF) technology, which greatly extends the elements in the browser for creating UI. WPF lets you create
immersive graphics, animation, media, and other rich client features, extending browser-based UI beyond what is
available with HTML alone. Extensible Application Markup Language (XAML) provides declarative markup syntax for creating
WPF elements.
Extensions to JavaScript. Silverlight provides extensions to the universal
browser scripting language that provide powerful control over the browser UI, including the ability to work with WPF elements.
Cross-browser, cross-platform support. Silverlight runs the same on allpopular browsers (on any platform). You can design and develop your application without having to worry about which browser or
platform your users have.
Integration with existing applications. Silverlight integrates seamlessly with your existing JavaScript and ASP.NET AJAX code to
complement functionality you have already created.
Access to the .NET Framework programming model and to associated tools.
You can create Silverlight-based applications using dynamic languages such as managed JScript and IronPython as well as languages
such as C# and Visual Basic. You can use development tools such as Visual Studio to create Silverlight-based applications. for more
information.
LINQ. Silverlight includes language-integrated query (LINQ), which enables you to program data access using intuitive native syntax
and strongly typed objects in .NET Framework languages. If you already use ASP.NET, you can integrate Silverlight with the server
and client capabilities of ASP.NET that you are familiar with. You can create server-based resources in ASP.NET and use the AJAX
capabilities of ASP.NET to interact with server-based resources without interrupting the user
2.1.2. Running Silverlight-based Applications
Silverlight-based applications run in the browser. Silverlight makes sure that you can run your applications in all modern browsers,
without having to create browser-specific code. To run a Silverlight-based application, users require a small plug-in in their browser.
The plug-in is free. If users do not already have the plug-in, they are automatically prompted to install it. The download and
installation take seconds and require no interaction from the user except permission to install.
2.1.3. Creating Silverlight-based Applications
You can create Silverlight-based applications using skills that you already have and tools that you are already familiar with. You can
create Web pages that use both HTML and WPF elements with Silverlight. Like HTML, XAML enables you to create UI for your
Web-based application with declarative syntax, with the difference that XAML provides significantly more powerful elements.
2.2 SILVERLIGHT AS A PART OF USER-EXPERIENCE CONTINNUM
Now, more than ever, customers are demanding applications and online experiences that not only meet their individual needs in terms
of effectiveness and efficiency, but also address the perception of satisfaction the user has with a company's products or services. In
most cases, the level of satisfaction will have a network and an emotional effect, shaping perceptions of the company as a whole, and,
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as an extension, the perceptions of those with whom the individual comes into touch. Microsoft acknowledges this connection and has
a made a renewed commitment to user experience (UX) as a part of the end-to-end experience. UX is more than a pretty UI; it is the
aggregation of the interaction point of a user with an application. Our mission is thus to enable a great user experience wherever the
customer needs that: on the Web, on devices, in Office, and in Windows. Two recent examples of Microsoft's own investment in UX
are Microsoft Windows Vista and Microsoft Office 2007. By focusing on the end-user experience first, subtle and somewhat radical
changes were made to both products in order to address productivity and satisfaction. Windows Vista introduces easier ways to
visualize and organize your files, media, and communications. In every case of the UI, a focus on user-centric task accomplishment
and experience was put first. Other examples of focusing on UX include the new task switcher (Alt+Tab) and Wi-Fi signal
notification.
Microsoft Office 2007 has introduced the new "Ribbon" concept to replace traditional toolbars. A natural extension, the ribbon
reduces time to find any given feature in an Office application to about 10 seconds.
Fig 2.2Microsoft UX continuum
From a platform perspective, Microsoft introduces a consistent offering that uses common skills to address the different application-
interaction surfaces, as indicated in Figure 1. ASP.NET AJAX offers the benefits of standard Microsoft support (around-the-clock
support for a period of 10 years) for AJAX-enabled applications built around Web standards. It allows standard Web applications to
be more effective by improving the interaction parameters of the application (such as refresh, resource usage, and navigation).
ASP.NET AJAX and Silverlight are designed to be complementary technologies. In the broader sense, Silverlight can interact with
any AJAX application, both client- and server-side. Examples for such integration include mapping applications, video playback with
rich presentation, and more. For connected applications on Windows, Microsoft provides the .NET Framework 3.0 programming
layer (shipped in Windows Vista and available
for Windows XP) that includes the Windows Presentation Foundation (WPF). By using WPF, one can create rich, immersive,
connected applications and experiences that can take full advantage of the Windows platform, including UI, media, offline
communication, and document support. WPF uses a superset of the same XAML that is used by Silverlight. Fig2.2.1Microsoft end-to-
end offering for UX As Figure shows, Silverlight is not an isolated island; it is a piece in a consistent end-to-end offering that enables
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taking application experiences to the next level. This offering includes server-side components, tools (Microsoft Expression and
Microsoft Visual Studio), and UX technologies.
2.3 SILVERLIGHT ARCHITECTUTE
Silverlight has few basic properties:
It integrates with various browsers on Windows and on the Macintosh.
It enables rendering of richer user experiences that are defined by XAML.
It render media (music and video).
It enables programming that is consistent with the Web programming model.
It is small.
:Silverlight was designed to address these properties
Fig 2.2.2 Architecture of Silverlight Lightweight browser plug-inSilverlight has Windows and Macintosh
modules that are designed to enhance Internet Explorer (versions 6.0 and 7.0), Firefox 2.0, and Safari browsers. The December 2006
CTP for Windows is 1.1MB in size.
Native presentation runtime Software-based browser enhancement that
allows rendering of XAML-based interactive 2-D graphics, text, and media, in addition to the browser native rendering of
HTML. XAML can be used in line, in a file, or in a package.
Interactive video and audioCross-platform independent media runtime
that can render Windows Media content (WMV and WMA) in addition toMP3 (will be available after the December 2006
CTP). Video and audio are handled as a media element in XAML, enabling flexibility in their presentation. Furthermore, the
media support leverages the huge infrastructure and ecosystem around Windows Media, enabling cost-effective delivery of
top-quality media.
Programming layerIn consistency with the Web architecture, Silverlight
XAML is exposed using a DOM model to JavaScript. That way, AJAX programs can utilize the extended markup rendering
capability using the same programming paradigms and practices (on the client and on the server). After the December 2006
CTP, we will also enable a managed code programming model using a subset of full CLR that will enhance the
programmability side of the browsers to enable more performant and more scalable Web applications.
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2.3.1The Silverlight 1.0
Fig 2.3 Silverlight 1.0
Browser Plug-in At the top of the stack, a browser plug-in enables hosting in Microsoft Internet Explorer, Mozilla Firefox, or Apple
Safari. The recommended hosting and deployment of the plug-in is provided in the SDK. Primarily, the plug-in provides mechanisms
for the following:
Setting and changing the XAML content to be executed by the runtime.
Retrieving objects from the runtime, for manipulation through JavaScript.
Downloading content incrementally.
The rendering performance of the plug-in varies with the hosting parameters specified and the complexity of the content. We
recommend that you set the settings. Enable Frame Rate Counter property to true during development to display the frame rate in the
browser's status bar and identify performance bottlenecks. Hosting parameters that affect the consistency and performance of your
application include the following:
is Windowless Setting this parameter to false will ensure the highest framerate and will result in better visual display quality across various platforms. Windowed display is the best mode of operation for the
plug-in. Background If windowless mode is required, use an opaque background instead of a translucent or fully transparent
background for better performance. In particular, you should set the background to '#FF000000' where the first component is FF. A
transparent background affects performance because the browser has to re-render the area under the control with each frame. This
additional rendering, combined with the cost of blending images, can result in significantly slower performance on some operating
systems and browsers.
Element Tree
At the heart of a Silverlight-based application is a tree of objects, such as Path objects, Image objects, and MediaElement objects, that
you compose to build an application. This tree, which is called the element tree, is conceptually similar to an HTML tree. However, it
has a richer set of graphical elements than HTML, and the programming model is similar to the HTML Document Object Model
(DOM). The traversal order of the tree controls the order in which the objects in the application are drawn. To build an element tree,
you can use the XAML parser that is provided with Silverlight (by setting the source on the plug-in) or use the CreatueFromXAML
method. You can make changes to the element tree as follows:
You can use the JavaScript API to change child relationships and to set properties on the content.You can use the animation system to
change the value of properties over time.
If your application relies on per-frame manipulation of the element tree, we recommend that you test its performance by using the
various JavaScript engines that are available on different operating systems and browsers. The recommended method for
manipulating the element tree over time is through the animation system. This approach is platform- and browser-independent and is
the most efficient method. JavaScript Programming Model The hosting Web page can call the content. FindName method to
retrieve a named element and can subsequently set properties or call methods that are exposed by that element. In addition, you can
attach keyboard and mouse event handlers to the elements or to the control. These event handlers enable the user to receive JavaScript
callbacks and respond to user input All objects in Silverlight 1.0 can be manipulated through a JavaScript object model..
Rendering Engine
The Silverlight rendering engine is optimized for rasterizing the contents of the element tree at the desired frame rate indicated on the
plug-in. In particular, the optimizations include the following:
Incremental redraw between frames, which reduces the number of pixels drawn based on the content that is changing.
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Not rasterizing content that is completely or partially occluded.
The rendering engine feature set includes the follow.
Text rendering support
Subpixel positioning.
Custom anti-aliasing for sharper text.
Transforms
Path transforms.o
Brush transforms.
o
Text and graphics remain sharp when scaled. Image data will be resampled, and quality will vary based on the resolution of the source
images.
Clipping:
Applied to a group of arbitrary drawing primitives, which could also include other nested clips, opacity effects, or opacity masks.
Opacity and opacity mask support:
Applied to a group of arbitrary drawing primitives, including other nested opacities or clips.
Animation System
Animation can enhance your graphical creation by adding movement and interactivity. By animating a background color or applying
an animated Transform, you can create dramatic screen transitions or provide helpful visual cues. You can create basic animations as
well as more complex and powerful animations that use key frames. Image Cache When an image references a URL, the image is
downloaded and cached in its decoded form for the duration of the application based on the URL that is specified. If you reference the
image multiple times within your application, it will be retrieved from the image cache, and that usage pattern will run quickly.
Referencing the same image from separate plug-ins takes advantage of the browser cache but requires the image to be decoded once
for each Silverlight-based application.
For best results, the resolution of the image being downloaded should be close to the display size of the image. If the image resolution
is significantly larger than the display size, bilinear filtering aliasing display artifacts can occur. If the image resolution is significantly
smaller than the display size, the image will appear blurry. In addition, picking an image resolution that is close to the display size
will ensure minimum download times. If zoom effects are required where this is simply not possible, store multiple resolutions on the
server and dynamically switch image sources during your animation. Text Engine The text engine will flow text strings within a
TextBlock by applying simple formatting and explicitly positioning glyphs for precise fixed-format display. It will either use a
specified font from the system (which is limited to a set that is available on all platforms) or use a specified Uniform Resource
Identifier (URI), which can refer to a TrueType font. Glyph Cache The glyph cache is used by the text engine to produce glyphs for
rendering from font files. The glyph is optimized for readability at a particular target resolution, so an initial cost is incurred on the
first frame on which text is drawn or when the scale of text changes. After this initial cost, scrolling or translation of text is
significantly cheaper. If your application requires dynamic scale changes of large text, it may be better to pick a vector representation
of that effect. Media Pipeline The video pipeline retrieves content either through progressive HTT P download or HTTP streaming
(for WMS servers), calls the decoders to decode the video, and displays with the rendering system and audio engine. If your
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application transitions from windowed to full-screen display, we recommend the use of a video brush that references the currently
playing media
element in the new full-screen content to ensure that the transition is seamless and does not require rebuffering.If the content in your application has to react to events in the video, you can insert markers in the video stream that will be fired to the
application. Decoders Silverlight 1.0 supports PNG and JPG files for imaging, Windows Media Video (WMV) files for video, and
Windows Media Audio (WMA) and MP3 files for audio.2.3.2.The Silverlight 2.0 Fig2.3 Silvelight2.0 Architecture
Silverlight 2 (previously referred to as version 1.1) includes a version of the .NET Framework, implementing the same full Common
Language Runtime version as .NET Framework 3.0; so it can execute programs written in any .NET language. Unlike the CLR
included with .NET Framework, multiple instances of the CoreCLR included in Silverlight can be hosted in one process. With this,
the XAML layout markup file (.xaml file) can be augmented by code-behind code, written in any .NET language, which contains the
programming logic. It can be used to programmatically manipulate both the Silverlight application and the HTML page
which hosts the Silverlight control. The XAML markup as well as the code, is compiled into .NET assemblies which are then
compressed using ZIP and stored in a file. .xap Silverlight ships with a lightweight class library which features, among
others, extensible controls, XML Web Services, networking components and LINQ APIs. This class library is a subset of and is
considerably smaller than .NET Framework's Base Class Library. Silverlight code runs in a sandbox which prevents
invoking platform APIs. Silverlight 2 also adds support for adaptive streaming of media files (which allows Silverlight to choose the
bit rate of the media based on available bandwidth) as well as Windows Media DRM and PlayReady DRM in media
files. The version of .NET Framework in Silverlight adds a subset of WPF UI programming model, including support for shapes,
documents, and media and animation objects of WPF. Beta 2 onwards,it ships with more than 30 UI controls[(including,
,
,
, and controls, TextBox CheckBox Slider ScrollViewer Calendar among others),supporting two-way databinding support, automatedlayout management (by means of, etc) as well as data manipulation [ StackPanel Grid controls such as DataGrid [and ListBox. UI
controls are skinnable using a template-based approach The included Base Class Library (BCL) provides classes for collections,
reflection, regular expressions, string handling and data access. It also supports LINQ, with the full support for LINQ to Objects and
expression trees. Almost all of the System.LINQ and System.LINQ.Expression namespaces are exposed. It also supports serialization
of objects, for data persistence. Silverlight can handle data in RSS or JSON format, in addition to XML. The BCL provides enhanced
support for working with XML data, including the XMLReader and XMLWriter classes. Silverlight 2 also supports asynchronous
programming via the use of the threading libraries. Silverlight also includes classes for data access over XML-based Web services,
REST, WCF Services and ADO.NET Data Services. The networking support in Silverlight can be used by Silverlight applications to
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communicate using HTTP, or at the lower socket level. Cross-domain communication is supported. Silverlight uses an XML-based
configuration file to control the cross-domain resource access policy, both for HTTP connections as well as socket connections. It can
be used by site administrators to control which resources a Silverlight application that did not originate in the domain of the site can
access. In addition, Silverlight also supports the Adobe Flash cross domain policy file format. Silverlight sockets can only
[ initiate a connection; they cannot listen for connections. Silverlight 2 includes the Dynamic Language Runtime (DLR) which
allows dynamic compilation and execution of dynamic (scripting) languages.Compilers for the languages based on the DLR
(including IronPython and IronRuby) are be packaged with the DSL app in the package. The DSL SDK includes a .xap web server
named Chiron that can dynamically package all the dependencies for the DSL application and serve it to the browser. The first
upcoming languages written for the DLR are Managed JScript, IronPython 2.0, and IronRuby. Microsoft also plans to build Visual
Basic .NET 10.0 (VBx) on the DLR. All four languages share the same infrastructure to allow Silverlight to compile and execute the
language source. Conversely, other .NET languages must be compiled ahead of time and delivered to Silverlight as .NET assemblies.
The implementation of Managed JScript conforms to the ECMAScript 3.0 specification, and Microsoft claims that it is 250 times
faster than interpreted JScript. With the integration of .NET Framework, Silverlight also allows HTML-managed code interaction,
which allows manipulation of HTML DOM elements from managed code, as well as allow JavaScript code to call managed code
and use objects instantiated by managed code. Silverlight encloses JavaScript objects and DOM elements in managed wrappers to
make them available from managed code. However, in the 1.1 alpha release directly calling JavaScript code is not [implemented, but
managed code events can fire JavaScript handlers. A Silverlight instance does not need to have a UI component in order to manipulate
the HTML DOM from managed code.[ It is done by creating a XAML Canvas with its width and height set to zero, and using its
code-behind code to modify the Document Object Model of the HTML page via the APIs in the System.Browser namespace.
Silverlight 2 includes Deep Zoom, a technology derived from Microsoft Live Labs Photosynth. It allows users to zoom into or out of
an image (or a collage of images), with smooth transitions, using the mouse wheel. The images can scale from 2 or 3 megapixels in
resolution to gigapixel range, but the user need not wait for it to be downloaded entirely; rather Silverlight downloads only the parts in
view, optimized for the zoom level being viewed.Beta 2 onwards, Deep Zoom uses [ an XML-based file format.[Silverlight 2 also
allows limited filesystem access to Silverlight applications. It can use the operating system's native Open file dialog box to browse
to any file (which the user has access to). The file is sanitized of path information to prevent the application from getting access to
information like user name and can be opened only in read-only mode. For local storage of data, Silverlight provides isolated
local storage (isostorage), which is stored, outside the browser cache, in a hidden [ folder inside the user profile's private folder. It is
by default set to 1 MB per URL,but can be changed by the user. Data stored by a Silverlight application in the isostorage is identified
by the URL that it loads from, can be accessed by that application only. All instances of Silverlight share the same isostorage, so all
instances of the same Silverlight application can share the saved data, even if they are running on different browsers.
Silverlight CoreCLR uses an attribute based security model, as opposed to the Code Access Security (CAS) model of the desktop
version of .NET Framework. All assemblies are marked with a security attribute, which can be either transparent
(SecurityTransparentAttribute), safecritical (SecuritySafeCriticalAttribute) or critical (SecurityCriticalAttribute) . Methods in
transparent assemblies runs with partial trust, and any code in such assemblies cannot call critical methods. They also cannot contain
unverifiable code (use the unsafe C# keyword or use pointers) or invoke system functions by means of P/Invoke. Code in both critical
and safecritical assemblies run with full trust, and are not subject to such limitations. However, critical methods can only be called
from safecritical methods and not transparent methods. Thus transparent methods are prevented from using methods that can cause
system wide changes. Instead, they have to call safecritical methods which will verify that the call is safe and within the limited rights
of the caller, and then proxy it to the critical methods. In fact, the IsoStorage APIs are exposed as safecritical methods. An assembly
that does not have any attribute set is run as a transparent method. The limitations also apply for type inheritance, virtual method calls
and interface method calls as well. Silverlight assemblies can contain members that are not usable by CoreCLR but can be by .NET
Framework CLR; such methods will not be loaded when the assembly is being executed by Core CLR. However, only platform code
is allowed to be marked as Critical or Safe Critical. The Silverlight runtime ensures that platform assemblies are loaded only from the
Silverlight installation directory, and are digitally signed by Microsoft. This effectively means that all user application assemblies can
only be transparent code and run under partial trust and limited rights. Platform code can be marked with[ either attribute. The BCL
methods of the .NET Framework, which have the Internet attribute set allowing them to be called from untrusted code originating
from Internet, are exposed in Silverlight BCL as transparent methods.
2.4. COMPATIBILITY
The following table presents an availability and compatibility matrix of Silverlight versions for various operating systems and web
browsers.
OS/browser
IE
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IE
IE
IE
FirefoxSea
Safari
Konquero
Opera
6
6
7
8
Monkey/Mozil
r
SP
SV
la
1
1
Windows
N/
N/
1.0,
2.0
1.0, 2.0
1.0,
N/A
Unofficiall
Vista/2008
A
A
2.0
2.0;
y
via
NPAP
I
Windows
N/
1.0,
1.0,
1.0, 2.0
1.0,
N/A
Unofficiall
XP/2003/Ho
A
2.0
2.0
2.0;
y
me Server
via
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NPAP
I
Windows
2.0
N/
N/
N/
N/A
2.0;
N/A
Planned
2000
A
A
A
via
NPAP
I
Windows
1.0
N/
N/
N/
N/A
N/A
N/A
N/A
Mobile 6
A
A
A
Mac OS
N/
N/
N/
N/
1.0
1.0
N/A
Planned
10.4/10.5
A
A
A
A
PowerPC
Mac OS
N/
N/
N/
N/
1.0, 2.0
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1.0,
N/A
Planned
10.4/10.5
A
A
A
A
2.0
Intel
Linux x86
N/
N/
N/
N/
Planned
N/A
Planned
Planned
A
A
A
A
Linux x86-64 N/
N/
N/
N/
Planned
N/A
Planned
Planned
A
A
A
A
Table2.1 Compatibility
Opera will be officially supported with future builds.
[Unofficially Silverlight
supports Opera already, via a hack.
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On Linux
, the functionality will be made available via the compatible third-
^
party Moonlight runtime.
Moonlight will be available for the major Linux [ distributions, with support for Firefox, Konqueror, and Opera browsers.
Silverlight for Mobile will be used to run Silverlight content on mobile devices. The first CTP for Windows Mobile 6 will be released
in 2nd Quarter of 2008. Nokia has announced plans to make Silverlight for Mobile available [for S60 on Symbian OS, as well as for
Series 40 devices and Nokia Internet tablets. Silverlight for Mobile will initially support Silverlight 1.0 content. Additional platforms
are being considered as well.
2.5. DEVELOPMENT TOOLS
Silverlight applications can be written in any .NET programming language. As such, any development tools which can be used
with .NET languages can work with Silverlight, provided they can target the Silverlight Core CLR for hosting the application, instead
of the .NET Framework CLR. Microsoft has positioned Microsoft Expression Blend versions 2.0 and 2.5 for designing the UI of
Silverlight 1.0 and 2 applications respectively. Visual Studio 2008 can be used to develop and debug Silverlight applications. To
create Silverlight projects and let the compiler target CoreCLR, Visual Studio 2008 requires the Silverlight Tools for Visual Studio
which is available as a beta release. [ A Silverlight project contains the Silverlight.js and CreateSilverlight.js files which initializes the
Silverlight plugin for use in HTML pages, a XAML file for the UI, and code-behind files for the application code. Silverlight
applications are debugged in a manner similar to ASP.NET applications. Visual Studio's CLR Remote Cross Platform Debugging
feature can be used to debug Silverlight applications running on a different platform as well
Building a Simple Silverlight Application
Let's start by taking a look at the Microsoft Expression Blend to create a very simple application in XAML for Silverlight. To create
a Silverlight application in Blend, select File -> New project and the New Project dialog box open. Fig.2.4 Creating a new Silverlight
project with Expression Blend Select OK and a new project will be created. This project will contain a default HTML page, some
JavaScript code-behind this page, a XAML document, a JavaScript code behind for the XAML document and Silverlight.js.
Silverlight.js contains the code for downloading and instantiating the Silverlight control. This is provided to you as part of the
Silverlight SDK. Default.html is a standard HTML Web page. This contains three JavaScript script references, pointing to
Silverlight.js, Default.html.js (which contains the application specific code for instantiating Silverlight), and Scene.xaml.js (which
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contains the event handlers for application events defined in the XAML).
This is designed to separate the page (default.html), from the instantiation logic (default.html.js), and the design (Scene.xaml), and the
event code (Scene.xaml.js). But, enough with the theory, lets get down to developing a simple application Using Visual Studio
You can create Silverlight-based applications using Visual Studio 2008. (Silverlight support for Visual Studio 2008 is available as a
plug-in for the IDE.) Visual Studio provides the same tools for Silverlight, such as powerful editors, project management, debugging,
and so on, that it already provides for creating applications with the .NET Framework Fig2.5 Visual Studio2.6. DEPLOYMENT AND PACKAGING
Content for a Web page that contains Silverlight elements can be created by using the following tactics:
Inline XAML and JavaScript.
External XAML files and JavaScript files.
Compressed content package (available after the December 2006 CTP) that
contains XAML, managed code, images, fonts, and media. Streaming mediasources can be referenced from the XAML media
elements.
Fig 2.6 Silverlight packaging (after Feb 2007 CTP) We believe that the flexibility of application packaging and the consistency of the
application architecture with Web standards and operations will create many opportunities for improving the impact and effectiveness
of Web applications, making applications more scalable, fault-tolerant, and dynamic (they can change their markup on the fly), and
making content more discoverable. Web pages that require Silverlight can detect if the Silverlight plug-in is installed, and can direct
users to download it and install it (either through a redirect or through an object tag). The Silverlight SDK has documentation on that.
2.7. SCENARIOS FOR USING SILVERLIGHT
Silverlight is perfect for the following Web application scenarios that encompass many real-world scenarios:
Web media Branded playback with events, video and marketing mix,
dynamic videos with ads, audio playback, and so forth Rich islands on a page (mini apps) Casual games and gadgets
Web visualization elements Navigation properties, data visualization, and
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ads
Silverlight is designed for Web page content that is connected to its host (it will not work offline), that deeply engages the user, and
that can render on any browser.
3. CONCLUSIONS
3.1 CRITICISM
Silverlight has been criticized for keeping Linux out of their official offering. Even though Microsoft is officially collaborating on the
Moonlight project, Bruce Chizen, former CEO of Adobe, and maker of direct competitor Flash, has questioned "the commitment of
Microsoft to keep the Silverlight platform compatible with other OS than Windows". His concerns are based on "examples from
history" where Microsoft has launched products with promises of ongoing cross-platform compatibility that no longer apply, such as
Internet Explorer for UNIX, the Microsoft. Java Virtual Machine, OS/2, and Windows Media Player
3.2 MOONLIGHT
Moonlight is an upcoming free and open-source implementation of the Microsoft Silverlight runtime. It is currently being developed
by the Mono Project.Silverlight 1.0 was released on September 5, 2007.it is developed so as to include the features of Microsoft
Silverlight in Linux based systems. Moonlight is also usable outside of the browser as a Gtk+ widget. A number of Desklets were
written using this new technology during the Novell Hack-week.
3.3 CONCLUSIONS
This report provides a high-level overview of the Silverlight architecture and how it fits into the Microsoft offering for
building next-generation Web applications. Silverlight is part of a larger revolution of the ways applications are designed, built, and
delivered. With markup-based UI and flexible programming models, businesses will be able to offer better experiences on the
right form factor for their customers.
4. REFERENCES
http://www.microsoft.com/SILVERLIGHT/
http://silverlight.net/
http://www.nsaneblog.com/software/260/microsoft-silverlight-review/
http://en.wikipedia.org/wiki/Silverlight
http://en.wikipedia.org/wiki/Moonlight
http://msdn.microsoft.com/enus/library/bb404713(VS.95).aspx
http://www.wynapse.com/Silverlight.aspx