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讨论Attribute的高级应用，代码演示了一个实际的例子：假设有一个订单处理系统，当一份订单提交的时候，系统检查库存，如果库存存量满足订单的数量，系统记录订单处理记录，然后更新库存，如果库存存量低于订单的数量，系统做相应的记录，同时向库存管理员发送邮件。
大致介绍了.NET Framework的对象调用拦截的实现机制，目的是让大家对这种机制有一个认识，通过代码的实现，可以看到消息如何被处理的过程。-Attribute to discuss high-level application code to demonstrate a practical example: Suppose there is a order processing system, when an order when submitted, the system checks inventory, if the inventory stock to meet the number of orders, the system record deal with record orders, and then update Stock, if the inventory stock is lower than the number of orders, the system to do the appropriate records, at the same time send a message to the Inventory Manager. Generally introduced. NET Framework object call interception mechanism to realize the aim is to enable everyone to have an understanding of such a mechanism, through the realization of the code, you can see how the news process.
