摘要：观察者模式的Java实现The Observer Pattern defines a one-to-manydependency between objects so that when oneobject changes state, all of its dependents arenotifi... 阅读全文

摘要：http://www.entityframeworktutorial.net/code-first/code-based-migration-in-code-first.aspx =Code based Migrationhttp://www.entityframeworktutorial.net/... 阅读全文