Gets or sets a value that indicates whether sub-properties of the dependency property do not affect the rendering of the containing object.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
The metadata has already been applied to a dependency property operation, so that metadata is sealed and properties of the metadata cannot be set.
This metadata option is pertinent for dependency properties that are reference types, where that type has property values of its own. Typically, the layout system logic is to assume that any dependency property with sub-properties potentially will affect layout, because checking all sub-properties for changes is more time consuming than actually running another render pass. Setting this option to true is useful for optimizing performance of the WPF framework level layout system implementation.
Properties on derived classes of PropertyMetadata are typically defined in the object model as read-write. This is so they can be adjusted after initialization of the instance. However, once the metadata is consumed as part of a call to Register, AddOwner, or OverrideMetadata, the property system will seal that metadata instance and properties that convey the specifics of the metadata are now considered immutable. Attempting to set this property after IsSealed is true on this metadata instance will raise an exception.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.