The Windows Presentation Foundation (or WPF) is a graphical subsystem for rendering user interfaces in Windows-based applications. WPF, previously known as "Avalon", was initially released as part of .NET Framework 3.0. Designed to remove dependencies on the aging GDI subsystem, WPF is built on DirectX, which provides hardware acceleration and enables modern user interface (UI) features such as transparency, gradients, and transforms. WPF provides a consistent programming model for building applications and provides a clear separation between the user interface and the business logic.
WPF also offers a new markup language, known as XAML, which is an alternative means for defining UI elements and relationships with other UI elements. A WPF application can be deployed on the desktop or hosted in a web browser. It also enables rich control, design, and development of the visual aspects of Windows programs. It aims to unify a number of application services: user interface, 2D and 3D drawing, fixed and adaptive documents, advanced typography, vector graphics, raster graphics, animation, data binding, audio and video.
WPF is included with Windows 7, Windows Vista, and Windows Server 2008 and is also available for Windows XP Service Pack 2 or later, and Windows Server 2003.
Microsoft Silverlight is a web-based subset of WPF that enables Flash-like web and mobile applications with the same programming model as .NET applications. 3D features are not supported, but XPS and vector-based drawing are included.
In WPF you can define the look of an element directly, via its properties, or indirectly with a Template or Style. At its simplest a style is a combination of property settings that can be applied to a UI element with a single property attribute. Templates are a mechanism for defining alternate UI for portions of your WPF application. There are several template types available in WPF (ControlTemplate, DataTemplate, HierarchicalDataTemplate and ItemsPanelTemplate).
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