开发.Net平台应用系统框架,对于应用系统来说，在这三个层次中，系统的主要功能和业务逻辑在应用服务层进行处理，对于系统框架来说，主要处理的也是这个层次的架构。-development. Net platform application framework for the application system, in which three levels, The main functions and business logic in the application layer services