組件： PresentationFramework (在 presentationframework.dll 中)
XML 命名空間： http://schemas.microsoft.com/winfx/2006/xaml/presentation
/** @event */ public void add_Unloaded (RoutedEventHandler value) /** @event */ public void remove_Unloaded (RoutedEventHandler value)
Direct routed events do not follow a route, they are only handled within the same element on which they are raised. Direct routed events do support other routed event behavior: they support an accessible handlers collection, and can be used as an EventTrigger in a style.
Loaded and Unloaded might both be raised on controls as a result of user-initiated system theme changes. A theme change causes an invalidation of the control template and the contained visual tree, which in turn causes the entire control to unload and reload. Therefore Unloaded cannot be assumed to occur only on navigation away from the page.