XamlType.LookupUsableDuringInitialization Method
Definition
Important
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Returns a value that indicates whether this XamlType is built top-down during XAML initialization.
protected:
virtual bool LookupUsableDuringInitialization();protected virtual bool LookupUsableDuringInitialization ();abstract member LookupUsableDuringInitialization : unit -> bool
override this.LookupUsableDuringInitialization : unit -> boolProtected Overridable Function LookupUsableDuringInitialization () As BooleanReturns
true if this XamlType is built top-down during XAML initialization; otherwise, false.
Remarks
Top-down is a metaphor that approximates XAML processor behavior when it creates the object graph. When built top-down, a type is instantiated, attached to the parent, and has its properties set. Top-down construction avoids invoking property-changed handlers multiple times. Such handling ripples up the object graph and therefore, eliminates the multiple handler calls and provides a performance optimization for startup of the object graph.
This method can be invoked by calls to IsUsableDuringInitialization.
The default implementation returns a value based on reading UsableDuringInitializationAttribute. It can also check BaseType for the attribute if no attribute is found on the immediate underlying type. If a value is unavailable, it returns false.
Override this method if you want IsUsableDuringInitialization to use different logic.
