Message in Chinese (Simplified) (中文(简体))
只有已请求取消的活动才能调用 MarkCanceled。调用此方法之前请检查 ActivityInstance.HasCancelBeenRequested。
Unlocalized message
Only activities which have been requested to cancel can call MarkCanceled. Check ActivityInstance.HasCancelBeenRequested before calling this method.
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