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设计模式 - State Pattern(状态模式)

发布时间：2020-12-12 15:52:24 所属栏目：MsSql教程来源：网络整理

导读：设计模式 - State Pattern(状态模式) ?? [源码下载] 设计模式 - State Pattern(状态模式) 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

设计模式 - State Pattern(状态模式)??

[源码下载]

设计模式 - State Pattern(状态模式)

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。

MessageModel

using ?System;

using ?System.Collections.Generic;

using ?System.Text;

namespace ?Pattern.State

{

????///?<summary>

????///?Message实体类

????///?</summary>

????public?class?MessageModel

????

{

????????///?<summary>

????????///?构造函数

????????///?</summary>

????????///?<param?name="msg">Message内容</param>

????????///?<param?name="pt">Message发布时间</param>

????????public?MessageModel(string?msg,?DateTime?pt)

????????

{

????????????this._message?=?msg;

????????????this._publishTime?=?pt;

????????}

????????private?string?_message;

????????///?<summary>

????????///?Message内容

????????///?</summary>

????????public?string?Message

????????

{

????????????get?

{?return?_message;?}

????????????set?

????????private?DateTime?_publishTime;

????????///?<summary>

????????///?Message发布时间

????????///?</summary>

????????public?DateTime?PublishTime

????????

{

????????????get?

}

AbstractMessageState

using ?System;

using ?System.Collections.Generic;

using ?System.Text;

namespace ?Pattern.State

{

????///?<summary>

????///?状态模式抽象类

????///?</summary>

????public?abstract?class?AbstractMessageState

????

{

????????///?<summary>

????????///?Context类型

????????///?</summary>

????????protected?Message?_message;

????????///?<summary>

????????///?Context类型属性

????????///?</summary>

????????public?Message?Message

????????

{

????????????get?

}

XmlMessage

using ?System;

using ?System.Collections.Generic;

using ?System.Text;

namespace ?Pattern.State

{

????///?<summary>

????///?Xml方式操作Message

????///?</summary>

????public?class?XmlMessage?:?AbstractMessageState

????

{

????????///?<summary>

????????///?构造函数

????????///?</summary>

????????///?<param?name="message">Context类型参数</param>

????????public?XmlMessage(Message?message)

????????

{

????????????this._message?=?message;

????????}

????????///?<summary>

????????///?改变状态

????????///?</summary>

????????public?override?void?StateChangeCheck()

????????

{

????????????//?如果UserId是admin则变换状态为SqlMessage

????????????if?(this._message.UserId?==?"admin")

????????????

????????///?<summary>

????????///?获取Message

????????///?</summary>

????????///?<returns></returns>

????????public?override?List<MessageModel>?Get()

????????

SqlMessage

using ?System;

using ?System.Collections.Generic;

using ?System.Text;

namespace ?Pattern.State

{

????///?<summary>

????///?Sql方式操作Message

????///?</summary>

????public?class?SqlMessage?:?AbstractMessageState

????

{

????????///?<summary>

????????///?构造函数

????????///?</summary>

????????///?<param?name="message">Context类型参数</param>

????????public?SqlMessage(Message?message)

????????

{

????????????this._message?=?message;

????????}

????????///?<summary>

????????///?改变状态

????????///?</summary>

????????public?override?void?StateChangeCheck()

????????

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