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。
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。
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