A similar problem exists with return values. You can define delegates that have return types other than void. You could write a callback to check for user aborts.
在返回值上也存在相似的问题。你可以定义有返回值的委托而不是无返回值的。你可以编写回调来检查用户的放弃操作。
Yesterday was a check of void, tomorrow is a promissory note, and today is the only cash you got.
昨天是一张作废的支票，明天是一张期票，而今天则是你惟一拥有的现金。
This check is void without a colored background on the front & an artificial watermark with yellow fluorescent fibres on the back hold at angle to view.
本票据正面须有彩色背景图案，背面角上须有黄色荧光纤维的人工水印，否则视为无效票据。
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