If your application has a button to cancel a long-running operation but you're doing work in the UI thread, the cancellation event won't be delivered until after the operation has finished!
如果应用程序有一个按钮用于取消某个长时间运行的操作，而您正在使用UI线程执行操作，那么这个取消事件只有到UI线程所做的操作完成后才会被处理！
'Cancel', which allows us to change our mind, and exit the dialog without doing anything at all.
取消如果你改变了主意，可以退出对话框，不作任何改变。
I was able to hit cancel on these notifications and ignore them, and go about whatever I was doing.
我能击中取消对这些通知而忽视他们，去了解我在做什么。
I was able to hit cancel on these notifications and ignore them, and go about whatever I was doing.
我能击中取消对这些通知而忽视他们，去了解我在做什么。
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