The Business Logic Layer (BLL) is where the business rules are centralized.
业务逻辑层 (BLL) 是集中存放业务规则的地方。
The example in this article consists of the Data Abstract Layer (DAL), Data Transfer Objects (DTOs), the Business Logic Layer (BLL), the Presentation Layer, and supporting helper classes.
本文中的示例包含数据抽象层(DAL)、数据传输对象(DTO)、业务逻辑层(BLL)、表示层和用于支持的 helper 类。
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