Assembly: PresentationCore (in PresentationCore.dll)
This method should be implemented by timeline classes that need to provide a custom natural Duration when the Duration property is set to Automatic. If the author cannot determine the natural duration, this method should return Automatic.
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.