Because it performs cleanup tasks , such as saving state information , closing files and connections to databases , and other tasks that must be done before releasing the object ，因为它执行清理任务，如保存状态信息、关闭文件和与数据库的连接，以及在释放对象前必须完成的其他任务。
For example , the part of the application that performs recovery may not be able to detect the poison message , or may not be able to safely clean up the saved state for the conversation 但是，有时候可能需要手动删除有害消息。例如，部分执行恢复的应用程序可能无法检测有害消息，或者无法安全地清除会话的保存状态。
The method uses a technology called mini - x - ray fluorescence to detect chemical elements in fingerprints without altering them , said christopher worley , a scientist on the project 参与该科研项目的科学家克里斯托弗?沃尔利说，该方法使用了一种“微x射线束荧光技术” ，可以探测到指纹携带的化学成分，却不会改变指纹的保存状态。
Application settings enables developers to save state in their application using very little custom code , and is a replacement for dynamic properties in previous versions of the . net framework 应用程序设置使开发人员可以使用极少量的自定义代码在他们的应用程序中保存状态，这些设置替代了. net framework的早期版本中的动态属性。
When releasing the lock and saving the thread state , the current thread state pointer must be retrieved before the lock is released ( since another thread could immediately acquire the lock and store its own thread state in the global variable ) 当事方锁并保存状态的时候，当前线程状态指针必须在锁释放之前回收（因为另一个指针将会随之获取锁并且在全局变量中保存它自己的线程状态） 。
