Business Delegates and Session Facades contained service methods, each having its own pair of input - and output-DTOs.

Business Delegate和Session Facade包含服务方法，各自都有其自己的input -和out put - dto对。

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It's quite common to have the same data type used as an argument to multiple business methods, across multiple business delegates.

对跨多个业务委派中的多个业务方法使用相同的数据类型作为参数，这是十分常见的。

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Note that the simple methods in Listing 1 can be called from other classes, such as our business delegates, to perform validation logic as needed.

可以从诸如业务委派等其它类上调用清单 1 中的简单方法，以按需执行验证逻辑。

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