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Silverlight 3 simplifies data binding somewhat by allowing target controls to be bound directly to the value of a property of another user interface control using XAML In Silverlight 2, target controls could be partially bound to the value of a property of another control using XAML However, in order for a control to be fully data bound to the value of a property of another control, the name of the control and the name of the property must be configured using XAML Silverlight 2 only accommodated setting the name of the property but not the name of the source control Silverlight 3 accommodates setting the name of the source control as well as the name of the property to bind to in XAML This form of data binding is called elementto-element binding and is implemented using XAML {Binding} expressions A {Binding} expression accepts three parameters: the property name, the element name, and the binding mode value The following markup illustrates a TextBlock control and a Slider control The Slider control is bound to the Angle property of the tbTransform
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9: Working with Data in Silverlight
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RotateTransform element for the TextBlock Due to the binding, as the Slider control is moved, the TextBlock automatically rotates with no code required
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<UserControl x:Class="L0906Page" xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" xmlns:d="http://schemasmicrosoftcom/expression/blend/2008" xmlns:mc="http://schemasopenxmlformatsorg/markupcompatibility/2006" mc:Ignorable="d" d:DesignWidth="400" Height="187"> <Grid x:Name="LayoutRoot" Background="#FFE4DFDF"> <TextBlock Margin="8,8,8,83" Text="superion" TextWrapping="Wrap" Height="Auto" FontSize="72" TextAlignment="Center" FontFamily="Arial Unicode MS" FontWeight="Bold" d:LayoutOverrides="Height" RenderTransformOrigin="05,05"> <TextBlockRenderTransform> <TransformGroup> <RotateTransform x:Name="tbTransform" /> </TransformGroup> </TextBlockRenderTransform> <TextBlockForeground> <LinearGradientBrush EndPoint="05,1" StartPoint="05,0"> <GradientStop Color="#FF7A7676" Offset="0412"/> <GradientStop Color="#FFF26414" Offset="1"/> </LinearGradientBrush> </TextBlockForeground> </TextBlock> <Slider Height="Auto" Margin="8,0,8,27" Maximum="360" VerticalAlignment="Bottom" Value="{Binding Angle, ElementName=tbTransform, Mode=TwoWay}" /> </Grid> </UserControl>
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Figure 9-4 illustrates a TextBlock control that is rotated by adjusting the value of a Slider control The BindingMode value is pulled from the BindingMode enumeration Here are the possible values:
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OneTime One-time binding is used to pull the value from the source and provide it to the target one time This setting is optimal for data that will be displayed but not be modified, such as a heading
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Microsoft Silverlight 3: A Beginner s Guide
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Figure 9-4
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A TextBlock being rotated through element-to-element binding to a Slider
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OneWay One-way binding is used to pull the value from the source and provide it to the target and keep it updated as the source changes This setting is optimal for readonly data being displayed TwoWay Two-way binding is used to keep the source and the target synchronized As the value of the source changes, the target is updated, and as the value of the target changes, the source is updated
Conclusion
Silverlight applications execute in a remote environment on the client s workstation that is isolated from the client s file system by the security sandbox Silverlight includes the ability to work with data coming from server-side databases as well as data stored in XML Silverlight includes classes located in the SystemXml namespace for working with XML data Silverlight also includes classes located in the SystemIsolatedStorage namespace that enable storing minimal data locally on the client s workstation Be aware that only disposable data should be stored in Isolated Storage Finally, Silverlight supports querying all types of data by using Language Integrated Query (LINQ)
Retrieving Server Resources
Microsoft Silverlight 3: A Beginner s Guide
Key Concepts & Skills
Compare synchronous to asynchronous programming techniques Learn how to use the WebClient class to download resources from a web server
pplications typically display files to a user that are large in size, such as images and media files If a single image, such as a company logo, is to be displayed to a user, it may be best to embed that image in the Silverlight application so that it is available on the client machine without any additional effort However, what if many images or media files are to be displayed to the user, or what if a variable number of files are to be displayed For instance, if a Silverlight control displays a list of products to the user, and the user selects a product to display details for, there is no way to determine which product the user will select and want to view the details and a photo of It would be incredibly inefficient and unwieldy to attempt to package photos of all products in the Silverlight application Hence, it is imperative that Silverlight has the ability to dynamically download resources from a server for use in an application
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