This refers to the unloading of any resources loaded from the item being previewed; it doesn't mean the preview handler itself is being unloaded.
这是指卸载被预览项目加载的任何资源；这并不意味着要卸载预览处理程序本身。
You use the preview view to run the RUI handler and preview the results.
用Preview视图则可运行RUI处理程序并预览结果。
If you use a Preview event class handler to mark the input event handled, the bubbling input event class handler will not be invoked.
如果您使用预览事件类别处理常式将输入事件标记为已处理，便不会叫用反升输入事件类别处理常式。
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