Gets the previous value of the property as reported by a property changed event.
Assembly: PresentationFramework (in PresentationFramework.dll)
The value and type constraint of this property will be established by the RoutedPropertyChangedEventArgs<T> constructor's type arguments.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.