Gets a value that indicates whether the text container associated with the current position has a valid (up-to-date) layout.
Assembly: PresentationFramework (in PresentationFramework.dll)
When necessary, operations that depend on a valid layout (such as the GetLineStartPosition method, GetCharacterRect method, and IsAtLineStartPosition property) attempt to automatically regenerate a valid layout before proceeding with the operation. Regenerating a layout can be a relatively expensive operation. Use this property to check for a valid layout before performing operations that may regenerate the layout. For more information, see Layout.
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.