[源码下载]
乐在其中设计模式(C#) - 状态模式(State Pattern)
作者:webabcd
介绍
允许一个对象在其内部状态改变时改变它的行为。对象看起来似乎修改了它所属的类。
示例
有一个Message实体类,对它的操作有Insert()和Get()方法,持久化数据在SqlServer数据库中或Xml文件里。在对象内部可以根据用户的不同选择不同的数据持久化方案。
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MessageModel
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AbstractMessageState
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XmlMessage
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SqlMessage
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Message
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client
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
运行结果
True
SQL方式获取Message 2007-3-6 22:58:17
True
XML方式获取Message 2007-3-6 22:58:17
参考
http://www.dofactory.com/Patterns/PatternState.aspx
OK
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