The guide discusses everything from the initial assessment and planning stages, to practical development solutions for the issues that arise during an upgrade, to the testing of upgraded applications.

• 该指南介绍了整个升级过程,包括从最初的评估和规划阶段到实际开发升级过程中出现的问题的解决方案,再到对升级后的应用程序的测试。