设计模式 - Provider Pattern(提供者模式)

介绍 为一个API进行定义和实现的分离。 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。根据配置文件中的配置来决定数据持久化方案是使用SqlServer数据库还是Xml文件。 <img alt="" border="0" height="1258" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-15e075fb7f2c36b02b1322857cad6153.png" width="619"> MessageModel 
<div>
<img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-f0cd6c7f9e7ae96feae062cb48f670f0.gif">
using
 System; <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-f0cd6c7f9e7ae96feae062cb48f670f0.gif"> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-f0cd6c7f9e7ae96feae062cb48f670f0.gif">
namespace
 Pattern.Provider <img align="top" alt="" id="Codehighlighter1_42_917_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-34031c708bfe702fe82d01ff5c6593aa.gif">
{ <img align="top" alt="" id="Codehighlighter1_48_99_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> /// <summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> /// Message实体类 <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-eec4c0236afc26744c9c4e910bc34958.gif"> /// </summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> public class MessageModel <img align="top" alt="" id="Codehighlighter1_134_915_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> { <img align="top" alt="" id="Codehighlighter1_144_294_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> /// <summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> /// 构造函数 <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> /// </summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> /// <param name="msg">Message内容</param> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-eec4c0236afc26744c9c4e910bc34958.gif"> /// <param name="pt">Message发布时间</param> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> public MessageModel(string msg, DateTime pt) <img align="top" alt="" id="Codehighlighter1_356_435_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> { <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> this._message = msg; <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> this._publishTime = pt; <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-eec4c0236afc26744c9c4e910bc34958.gif"> } <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> private string _message; <img align="top" alt="" id="Codehighlighter1_479_537_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> /// <summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> /// Message内容 <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-eec4c0236afc26744c9c4e910bc34958.gif"> /// </summary> <img align="top" alt="" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-587e34b10dcf5efbc0859b53470a2db3.gif"> public string Message <img align="top" alt="" id="Codehighlighter1_576_661_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> { <img align="top" alt="" id="Codehighlighter1_594_613_Open_Image" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-3112b7b6526db5bc83e275260ae60525.gif"> get { return _message; } <img

设计模式 - Provider Pattern(提供者模式)

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