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WPF - Resources

Jim Fawcett, Brown Bag Seminar Series Fall 2007. WPF - Resources. Reference. Windows Presentation Foundation Unleashed, Adam Nathan, SAMS, 2007

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WPF - Resources

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  1. Jim Fawcett, Brown Bag Seminar Series Fall 2007 WPF - Resources

  2. Reference • Windows Presentation Foundation Unleashed, Adam Nathan, SAMS, 2007 • Note: none of the material in this presentation is original from me. Everything has been drawn from Nathan’s book as paraphrases or quotations without quotes, with in some cases a little interpretation. Only a diagram or two is original.

  3. Resources • Binary Resources – used for years • Bitmaps, strings, compiled XAML • Logical Resources – New to WPF • Arbitrary .Net objects named and stored in an element’s Resources property.

  4. Packaging Binary Resources • Embedded inside an assembly • Loose files that are known to the application at compile time • Loose files that might not be know to the application at compile time

  5. Defining Binary Resources with Visual Studio • Add file to Visual Studio project and select the appropriate build action in project properties • Resource :Embeds resource into the assembly – may be a culture specific satellite assembly • Content:Leaves the resource as a loose file, but adds a custom attribute to the assembly that records existence and relative location of the file.

  6. Accessing Binary Resources • Access with Uniform Resource Identifier (uri) • A type converter enables uris to be specified in XAML as strings.<Image Height=“21” Source=“previous.gif” /> • The image was included in the Visual Studio project with build action of Resource.

  7. Localization • If your application contains binary resources that are specific to certain cultures, you can partition them into satellite assemblies that get loaded automatically.

  8. Logical Resources • New WPF-specific mechanism • Arbitrary .Net objects stored and named in an element’s Resources property. • The base classes FrameworkElement and FrameworkContentElement both have a Resources property of type System.Windows.ResourceDictionary • Most of the WPF classes derive from these base classes. • These resources are often used to store styles or data providers.

  9. Logical Resources <Window.Resources> <SolidColorBrush x:Key="backgroundBrush">Yellow</SolidColorBrush> <SolidColorBrush x:Key="borderBrush">Red</SolidColorBrush> </Window.Resources> <Window.Background> <StaticResourceResourceKey="backgroundBrush"/> </Window.Background> <DockPanel> <StackPanelDockPanel.Dock="Bottom" Orientation="Horizontal" HorizontalAlignment="Center"> <Button Background="{StaticResourcebackgroundBrush}" BorderBrush="{StaticResourceborderBrush}" Margin="5"> <Image Height="21" Source="zoom.gif"/> </Button>

  10. Walking the Resources Tree • The markup extension class implements the ability to walk the logical tree to find an item. • First checks the current element’s Resources collection. • If not found, it checks the parent element, its parent, etc, until it reaches the root element. • If all that fails, it looks in the resources collection of the Application object. • If that fails, it looks at the system default resources collection. • If that fails, it throws an InvalidOperationException.

  11. Static versus Dynamic Resources • There are two ways to access a logical resource: • Statically with StaticResource, meaning that the resource is applied only once when it is first needed. • Dynamically with DynamicResource, meaning that the resource is reapplied every time it changes. • A consumer of the resource sees changes, e.g., the resource is linked.

  12. End of Presentation

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