Caching is a powerful technique for increasing performance, but the whole idea behind caching works only as long as the result we cached remains valid. And here we get to the hard part of the problem: How do we determine when a cached item has become invalid and needs to be recreated? 在本文中, Toptal Freelance Software Engineer 丹尼尔·伊万诺夫 provides an ASP.网-based solution to replace invalid cached items and assure high throughput and performance of web applications designed to handle a high load.