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Note that this format works with any numeric type including the integer types. There s no special treatment for an Int32 or Int16, for example. They are multiplied up by 100, in just the same way as the floating-point types. This means that you can t format values in increments of less than 100 percent with an integer. For instance, 0 100 implies 0 percent, 1 100 implies 100 percent, and so on.

WPF and Silverlight offer the MediaElement, which can render videos. It can also be used to play audio files. In use, it s almost identical to the Image element; you just point it at a video file rather than a bitmap. Silverlight offers a VideoBrush that lets you create a brush from a video, in the same way that ImageBrush lets you create a brush from a bitmap. Slightly surprisingly, WPF does not offer this type this is a good example of how Silverlight is not a subset of WPF. It s possible to paint things with video in WPF, though; you just do it using something called a VisualBrush. VisualBrush is far more powerful than VideoBrush it lets you take any UI element (even one that has children, like a panel) and turn it into a brush. So you can wrap a MediaElement in a VisualBrush to create the same effect; Silverlight doesn t have VisualBrush, which is why it provides the more specialized VideoBrush. Speaking of moving images, you can also apply movement to other elements in a user interface.

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How can we generate and validate such tokens We first consider a scheme (which will turn out to be insufficient) in which tokens are generated using a cryptographic algorithm such that possession of a secret is necessary to produce a token that our application will consider valid One way of generating tokens with this property is to concatenate the value of a timestamp or counter c with the message authentication code (MAC) of the counter under a secret key KMAC (MACs were introduced in Section 15, and are covered in more detail in 15):.

<input name="content" required="false" type="description"> <description>The story (or just the first bit) for the news item. </description> <defaultValue>Microsoft Popfly has just been unveiled, and people everywhere are having fun expressing themselves! </defaultValue> <constraints/> </input> <input name="fullStoryUrl" required="false" type="url"> <description>A URL where the news item can be read.</description> <defaultValue>http://www.popfly.ms</defaultValue> <constraints/> </input> </inputs> </operation>

WPF and Silverlight allow any element to be animated most properties that have an impact on the appearance of the UI can be modified over time. Of course, you could achieve that yourself by setting up a timer, and modifying properties of UI elements each time the timer fires. But you can let the animation system do that work for you. A complete description of animation would fill a chapter, but Example 20-15 shows a typical example.

<UserControl.Resources> <Storyboard x:Key="ellipseAnimation"> <DoubleAnimation From="50" To="100" AutoReverse="True" RepeatBehavior="Forever" Storyboard.TargetName="animatedEllipse" Storyboard.TargetProperty="Width" /> </Storyboard> </UserControl.Resources>

Animations are separate objects from the things they animate, and typically live in a Resources section all elements have a Resources property which is a handy place to put useful objects. It s just a dictionary a name/value collection a specialized dictionary similar to those of the kind described in 9. This particular example would appear as a child of the UserControl at the root of the user interface. While this is a simple example, it illustrates all the important points. The whole thing is contained in a Storyboard this is a collection of animations. Animations are always defined in storyboards, as this enables you to target multiple properties, or perhaps orchestrate a sequence of different animations over time. This example is simple and contains just a single animation, but we re still required to put it in a Storyboard. The animation itself has a From and a To value specifying the range of values the property will span during the animation these are numbers because this is a DoubleAnimation (as in the System.Double floating-point type); if this were a ColorAnimation you d see color values in there instead. The AutoReverse and RepeatBehavior properties here indicate that this animation runs back and forth indefinitely. And the final two properties indicate the element and property to be animated. So somewhere in the Xaml we d expect to find an element with the name indicated, for example:

Something needs to kick the animation off. In the code behind, you d extract the animation from the resources and start it like this:

Here, + denotes string concatenation.9 To validate a token value arriving with an inbound request, we split the token into the MAC and counter-component (we assume that MACs are

Storyboard anim = (Storyboard) Resources["ellipseAnimation"]; anim.Begin();

There are other ways to start animations. WPF supports triggers, which let you place instructions in Xaml that certain animations should be run when specific things happen. So you could tie an animation to the raising of a MouseEnter event, for example, or run an animation when the value of a property changes. You can do something similar in Silverlight using behaviors, which make it easy to define a variety of UI responses (such as running animations) with Expression Blend. Both WPF and Silverlight also support automatic running of animations in control templates, as we ll see later.

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