_pAttachObject addExtensionSection canDelete claimChildren delegateName doubleClicked finishRestoring getAttachIDocumentObject getMDIView getViewProvider hide m_pViewProviewr setAttach setViewProvider show viewProviderCreating viewProviderIsBeingDestructed ViewProviderObserverDelegate viewProviderOnChange ~ViewProviderObserverDelegate

viewProviderIsBeingDestructed() virtual void viewProviderIsBeingDestructed ( ) virtual 视图提供者即将析构时回调 在 ViewProvider 析构前触发，可执行资源清理或提示。