乐在其中设计模式(C#) - 原型模式(Prototype Pattern).doc

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1、介绍用原型实例指定创建对象的种类，并且通过拷贝这个原型来创建新的对象。示例有一个Message实体类，现在要克隆它。MessageModelusingSystem;usingSystem.Collections.Generic;usingSystem.Text;namespacePattern.Prototype/*/Message实体类/publicclassMessageModel/*/构造函数/Message内容/Message发布时间publicMessageModel(stringmsg,DateTimept)this._message=msg;this._publishTime=p

2、t;privatestring_message;/*/Message内容/publicstringMessagegetreturn_message;set_message=value; privateDateTime_publishTime;/*/Message发布时间/publicDateTimePublishTimegetreturn_publishTime;set_publishTime=value;ShallowCopyusingSystem;usingSystem.Collections.Generic;usingSystem.Text;namespacePattern.Protot

3、ype/*/浅拷贝/publicclassShallowCopy:ICloneable/*/构造函数/publicShallowCopy()/*/实现ICloneable的Clone()方法/publicObjectClone()returnthis.MemberwiseClone(); privateMessageModel_mm;/*/Message实体对象/publicMessageModelMessageModelgetreturn_mm;set_mm=value;DeepCopyusingSystem;usingSystem.Collections.Generic;usingSyst

4、em.Text;namespacePattern.Prototype/*/深拷贝/publicclassDeepCopy:ICloneable/*/构造函数/publicDeepCopy()/*/构造函数/Message实体对象publicDeepCopy(MessageModelmm)_mm=mm;/*/实现ICloneable的Clone()方法/publicObjectClone()returnnewDeepCopy(newMessageModel(_mm.Message,_mm.PublishTime);privateMessageModel_mm;/*/Message实体对象/pub

5、licMessageModelMessageModelgetreturn_mm;set_mm=value;clientusingSystem;usingSystem.Data;usingSystem.Configuration;usingSystem.Collections;usingSystem.Web;usingSystem.Web.Security;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.WebControls.WebParts;usingSystem.Web.UI.HtmlControls

6、;usingPattern.Prototype;publicpartialclassPrototype:System.Web.UI.PageprotectedvoidPage_Load(objectsender,EventArgse)Response.Write(ShallowCopy演示如下：);ShowShallowCopy();Response.Write(DeepCopy演示如下：);ShowDeepCopy();privatevoidShowShallowCopy()ShallowCopysc=newShallowCopy();sc.MessageModel=newMessageMo

7、del(ShallowCopy,DateTime.Now);ShallowCopysc2=(ShallowCopy)sc.Clone();Response.Write(sc.MessageModel.Message);Response.Write();Response.Write(sc2.MessageModel.Message);Response.Write();sc.MessageModel.Message=ShallowCopyShallowCopy;Response.Write(sc.MessageModel.Message);Response.Write();Response.Wri

8、te(sc2.MessageModel.Message);Response.Write();privatevoidShowDeepCopy()DeepCopysc=newDeepCopy();sc.MessageModel=newMessageModel(DeepCopy,DateTime.Now);DeepCopysc2=(DeepCopy)sc.Clone();Response.Write(sc.MessageModel.Message);Response.Write();Response.Write(sc2.MessageModel.Message);Response.Write();sc.MessageModel.Message=DeepCopyDeepCopy;Response.Write(sc.MessageModel.Message);Response.Write();Response.Write(sc2.MessageModel.Message);Response.Write();运行结果ShallowCopy演示如下：ShallowCopyShallowCopyShallowCopyShallowCopyShallowCopyShallowCopyDeepCopy演示如下：DeepCopyDeepCopyDeepCopyDeepCopyDeepCopy