24 Design modes: Prototype mode (Prototype pattern)

Prototype mode (Prototype pattern)

Introduced
Specifies the kind of object created with the prototype instance, and creates a new object by copying the prototype.

Example
There is a message entity class, and now you want to clone it.

　　Messagemodel

Using system;using system.collections.generic;using system.text;namespace pattern.prototype{//<summary>// Message entity class///</summary> public class Messagemodel {//<summary>///constructor// /</summary>//<param name= "msg" >message content </param>//<param name= "PT" >message when released            Room </param> public Messagemodel (String msg, DateTime pt) {this._message = msg;        This._publishtime = pt;        } private string _message; <summary>//message content///</summary> public string Message {get            {return _message;}        set {_message = value;}        } private DateTime _publishtime;            <summary>//Message release time///</summary> public DateTime Publishtime {            get {return _publishtime;}        set {_publishtime = value;}    }}} 

　　Shallowcopy

Using system;using system.collections.generic;using system.text;namespace pattern.prototype{//    <summary >//Light copy///    </summary> public    class shallowcopy:icloneable    {        //<summary>        ///constructor///</summary> public shallowcopy () {}///<summary>//        Implement the Clone () method for icloneable///</summary>///        <returns></returns> public        Object Clone ()        {            return this. MemberwiseClone ();        }        Private Messagemodel _mm;        <summary>//        Message Entity object///        </summary> public        Messagemodel Messagemodel        {            get {return _mm;}            set {_mm = value;}}}}    

　　Deepcopy

Using system;using system.collections.generic;using system.text;namespace pattern.prototype{//<summary>//        Deep copy///</summary> public class Deepcopy:icloneable {//<summary>///constructors        </summary> public deepcopy () {}///<summary>//constructor </summary>//<param name= "MM" >message solid objects </param> public deepcopy (Messagemodel m        m) {_mm = mm; }///<summary>//Implement ICloneable's Clone () method///</summary>//<returns></ Returns> public Object Clone () {return new deepcopy (New Messagemodel (_mm. Message, _mm.        Publishtime));        } private Messagemodel _mm;            <summary>//Message Entity object///</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{Protecte        d void Page_Load (object sender, EventArgs e) {Response.Write ("Shallowcopy demo as follows: <br/>");        Showshallowcopy ();        Response.Write ("Deepcopy demo as follows: <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/>"); }}

　　Run results
The Shallowcopy demo is as follows:
Shallowcopy
Shallowcopy
Shallowcopyshallowcopy
Shallowcopyshallowcopy
The Deepcopy demo is as follows:
Deepcopy
Deepcopy
Deepcopydeepcopy
Deepcopy

24 Design modes: Prototype mode (Prototype pattern)