Gets or sets a value that indicates whether a dependency property potentially affects the measure pass during layout engine operations.
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.
FrameworkElement and FrameworkContentElement include an implementation of OnPropertyChanged that monitors effective value changes to all dependency properties that exist on an element. As part of that logic, dependency properties that change effective value and have metadata with set to true will initiate a deferred request to invalidate the visuals for that element. Because this WPF framework-level implementation is already in place, you typically do not need to look for dependency properties with unless you are substantially replacing or modifying the WPF framework-level layout behavior.
Custom OnPropertyChanged implementations might choose to have similar behavior for dependency property changes where is true.
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, after 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.
The following example obtains the default metadata from various dependency property fields, queries the value of various FrameworkPropertyMetadata properties on it, and uses the information to populate a table to implement a "metadata browser".