原型模式(Prototype Pattern)
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