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This is used by the layout system to trigger a recalculation of the layout on property-changes, thus exposing a declarative programming style for WPF, whereby almost everything, from setting colors and positions to animating elements can be achieved by setting properties. Visual objects provide a managed interface to a composition tree which is maintained by Media Integration Layer (MIL).Each element of WPF creates and adds one or more composition nodes to the tree.WPF employs XAML, an XML-based language, to define and link various interface elements.WPF applications can be deployed as standalone desktop programs or hosted as an embedded object in a website.WPF runtime libraries are included with all versions of Microsoft Windows since Windows Vista and Windows Server 2008.Users of Windows XP SP2/SP3 and Windows Server 2003 can optionally install the necessary libraries.
These elements can then be linked and manipulated based on various events, user interactions, and data bindings.Microsoft Silverlight provided functionality that is mostly a subset of WPF to provide embedded web controls comparable to Adobe Flash.3D runtime rendering had been supported in Silverlight since Silverlight 5.The specific advantage that XAML brings to WPF is that XAML is a completely declarative language, allowing the developer (or designer) to describe the behavior and integration of components without the use of procedural programming.
Although it is rare that an entire application will be built completely in XAML, the introduction of XAML allows application designers to more effectively contribute to the application development cycle.
It interfaces directly with Direct X and provides basic support for 2D and 3D surfaces, timer-controlled manipulation of contents of a surface with a view to exposing animation constructs at a higher level, and compositing the individual elements of a WPF application into a final 3D "scene" that represents the UI of the application and renders it to the screen., that is aware of the dependencies between the consumers of the property, and can trigger actions based on changes in properties.