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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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