Gets a value indicating whether the current size returned by layout measure is valid.
Assembly: PresentationCore (in PresentationCore.dll)
You can force measurement and arrangement to be invalidated by calling InvalidateMeasure on this element (or any parent element up the visual tree). This designates the layout for recomposition asynchronously, occurring at a time determined by the layout system. Alternatively, you could make an immediate call to UpdateLayout. However, you should only call UpdateLayout if it is likely that no further invalidations are pending (a large number of unnecessarily forced updates will have performance consequences).
If is false, IsArrangeValid must also be false (by the enforced logic of the layout process, arrangement cannot be valid without measurement first being valid).
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.