乐在其中设计模式(C#) - 装饰模式(Decorator Pattern)

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <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; } 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// 操作Message的抽象构件（Component） 
         /// </summary> 
         public  abstract  class AbstractMessage 
        { 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  abstract List<MessageModel> Get(); 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  abstract  bool Insert(MessageModel mm); 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// Sql方式操作Message（ConcreteComponent） 
         /// </summary> 
         public  class SqlMessage : AbstractMessage 
        { 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override List<MessageModel> Get() 
                { 
                        List<MessageModel> l =  new List<MessageModel>(); 
                        l.Add( new MessageModel( "SQL方式获取Message", DateTime.Now)); 
 
                         return l; 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  override  bool Insert(MessageModel mm) 
                { 
                         // 代码略 
                         return  true; 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// Xml方式操作Message（ConcreteComponent） 
         /// </summary> 
         public  class XmlMessage : AbstractMessage 
        { 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override List<MessageModel> Get() 
                { 
                        List<MessageModel> l =  new List<MessageModel>(); 
                        l.Add( new MessageModel( "XML方式获取Message", DateTime.Now)); 
 
                         return l; 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  override  bool Insert(MessageModel mm) 
                { 
                         // 代码略 
                         return  true; 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// 装饰AbstractMessage（Decorator） 
         /// </summary> 
         public  abstract  class AbstractMessageWrapper : AbstractMessage 
        { 
                 private AbstractMessage _abstractMessage; 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="abstractMessage">AbstractMessage</param> 
                 public AbstractMessageWrapper(AbstractMessage abstractMessage) 
                { 
                         this._abstractMessage = abstractMessage; 
                } 
 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override List<MessageModel> Get() 
                { 
                         return _abstractMessage.Get(); 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  override  bool Insert(MessageModel mm) 
                { 
                         return _abstractMessage.Insert(mm); 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// 扩展出用户验证的功能（ConcreteDecorator） 
         /// </summary> 
         public  class CheckUserWrapper : AbstractMessageWrapper 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="abstractMessage">AbstractMessage</param> 
                 public CheckUserWrapper(AbstractMessage abstractMessage) 
                        :  base(abstractMessage) 
                { 
                         
                } 
 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override List<MessageModel> Get() 
                { 
                        List<MessageModel> l =  base.Get(); 
 
                         foreach (MessageModel mm  in l) 
                        { 
                                mm.Message +=  "（经过用户验证）"; 
                        } 
 
                         return l; 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  override  bool Insert(MessageModel mm) 
                { 
                         // 在这里扩展功能 
 
                         return  base.Insert(mm); 
                } 
 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Decorator 
{ 
         /// <summary> 
         /// 扩展出输入验证的功能（ConcreteDecorator） 
         /// </summary> 
         public  class CheckInputWrapper : AbstractMessageWrapper 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="abstractMessage">AbstractMessage</param> 
                 public CheckInputWrapper(AbstractMessage abstractMessage) 
                        :  base(abstractMessage) 
                { 
                         
                } 
 
                 /// <summary> 
                 /// 获取Message 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override List<MessageModel> Get() 
                { 
                        List<MessageModel> l =  base.Get(); 
 
                         foreach (MessageModel mm  in l) 
                        { 
                                mm.Message +=  "（经过输入验证）"; 
                        } 
 
                         return l; 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="mm">Message实体对象</param> 
                 /// <returns></returns> 
                 public  override  bool Insert(MessageModel mm) 
                { 
                         // 在这里扩展功能 
 
                         return  base.Insert(mm); 
                } 
        } 
}

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.Decorator; 
 
public partial  class Decorator : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                AbstractMessage message =  new SqlMessage(); 
 
                AbstractMessageWrapper amr =  new CheckUserWrapper(message); 
 
                Response.Write(amr.Get()[0].Message +  " " + amr.Get()[0].PublishTime.ToString()); 
                Response.Write( "<br />"); 
 
                AbstractMessageWrapper amr2 =  new CheckInputWrapper(message); 
 
                Response.Write(amr2.Get()[0].Message +  " " + amr2.Get()[0].PublishTime.ToString()); 
                Response.Write( "<br />"); 
 
                AbstractMessageWrapper amr3 =  new CheckUserWrapper(message); 
                AbstractMessageWrapper amr4 =  new CheckInputWrapper(amr3); 
 
                Response.Write(amr4.Get()[0].Message +  " " + amr4.Get()[0].PublishTime.ToString()); 
                Response.Write( "<br />"); 
        } 
}