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並前往https://supportcenter.devexpress.com/ticket/details/t1013902/closing-a-tab-fails-when-closed-in-an-async-onclose-event-handler

Closing a tab fails when closed in an async OnClose event ...

OnClose () does not respect CancelEventArgs. ... Alas, if you close the window which hosts the tab control, the tab has to be closed manually ...

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