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

作者：webabcd

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。

MessageModel

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Prototype 
{ 
        /// <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 { _message = value; } 
                } 
 
                private DateTime _publishTime; 
                /// <summary> 
                /// Message发布时间 
                /// </summary> 
                public DateTime PublishTime 
                { 
                        get { return _publishTime; } 
                        set { _publishTime = value; } 
                } 
        } 
}

ShallowCopy

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Prototype 
{ 
        /// <summary> 
        /// 浅拷贝 
        /// </summary> 
        public class ShallowCopy : ICloneable 
        { 
                /// <summary> 
                /// 构造函数 
                /// </summary> 
                public ShallowCopy() 
                { 
                         
                } 
 
                /// <summary> 
                /// 实现ICloneable的Clone()方法 
                /// </summary> 
                /// <returns></returns> 
                public Object Clone() 
                { 
                        return this.MemberwiseClone(); 
                } 
 
                private MessageModel _mm; 
                /// <summary> 
                /// Message实体对象 
                /// </summary> 
                public MessageModel MessageModel 
                { 
                        get { return _mm; } 
                        set { _mm = value; } 
                } 
        } 
}

DeepCopy

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Prototype 
{ 
        /// <summary> 
        /// 深拷贝 
        /// </summary> 
        public class DeepCopy : ICloneable 
        { 
                /// <summary> 
                /// 构造函数 
                /// </summary> 
                public DeepCopy() 
                { 
                         
                } 
 
                /// <summary> 
                /// 构造函数 
                /// </summary> 
                /// <param name="mm">Message实体对象</param> 
                public DeepCopy(MessageModel mm) 
                { 
                        _mm = mm; 
                } 
 
                /// <summary> 
                /// 实现ICloneable的Clone()方法 
                /// </summary> 
                /// <returns></returns> 
                public Object Clone() 
                { 
                        return new DeepCopy(new MessageModel(_mm.Message, _mm.PublishTime)); 
                } 
 
                private MessageModel _mm; 
                /// <summary> 
                /// Message实体对象 
                /// </summary> 
                public MessageModel MessageModel 
                { 
                        get { return _mm; } 
                        set { _mm = value; } 
                } 
        } 
}

client

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
 
using Pattern.Prototype; 
 
public partial class Prototype : System.Web.UI.Page 
{ 
        protected void Page_Load(object sender, EventArgs e) 
        { 
                Response.Write("ShallowCopy演示如下：<br />"); 
                ShowShallowCopy(); 
 
                Response.Write("DeepCopy演示如下：<br />"); 
                ShowDeepCopy();         
        } 
 
        private void ShowShallowCopy() 
        { 
                ShallowCopy sc = new ShallowCopy(); 
                sc.MessageModel = new MessageModel("ShallowCopy", DateTime.Now); 
 
                ShallowCopy sc2 = (ShallowCopy)sc.Clone(); 
 
                Response.Write(sc.MessageModel.Message); 
                Response.Write("<br />"); 
                Response.Write(sc2.MessageModel.Message); 
                Response.Write("<br />"); 
 
                sc.MessageModel.Message = "ShallowCopyShallowCopy"; 
 
                Response.Write(sc.MessageModel.Message); 
                Response.Write("<br />"); 
                Response.Write(sc2.MessageModel.Message); 
                Response.Write("<br />"); 
        } 
 
        private void ShowDeepCopy() 
        { 
                DeepCopy sc = new DeepCopy(); 
                sc.MessageModel = new MessageModel("DeepCopy", DateTime.Now); 
 
                DeepCopy sc2 = (DeepCopy)sc.Clone(); 
 
                Response.Write(sc.MessageModel.Message); 
                Response.Write("<br />"); 
                Response.Write(sc2.MessageModel.Message); 
                Response.Write("<br />"); 
 
                sc.MessageModel.Message = "DeepCopyDeepCopy"; 
 
                Response.Write(sc.MessageModel.Message); 
                Response.Write("<br />"); 
                Response.Write(sc2.MessageModel.Message); 
                Response.Write("<br />"); 
        } 
}

运行结果
ShallowCopy演示如下：
ShallowCopy
ShallowCopy
ShallowCopyShallowCopy
ShallowCopyShallowCopy
DeepCopy演示如下：
DeepCopy
DeepCopy
DeepCopyDeepCopy
DeepCopy

参考
http://www.dofactory.com/Patterns/PatternPrototype.aspx

OK
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     本文转自webabcd 51CTO博客，原文链接：http://blog.51cto.com/webabcd/344497，如需转载请自行联系原作者