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大苞谷忙问什么事。苏角见到许负的时候，得知了事情来龙去脉，感叹一声。Logically speaking. Firewalls can be roughly divided into host firewalls and network firewalls.　　However, ...In fact, WCF content has been read very early, and many predecessors in the blog park have written it very well. However, I think I still need to summarize it myself, because only in this way can knowledge be my own, and how well others write it, after you read it, it is actually someone else, so I encourage you to make a few points (for these points, it is also a reminder to yourself):2. In the above example, a set of state objects are created for each Context object. In fact, these state objects can be shared, and each Context object can share one state object. This is also one of the application scenarios of the meta-sharing modeIt has certain innovative ability and can give appropriate diagnosis and treatment suggestions to cases that are not suitable for the guidelines.