乐在其中设计模式(C#) - 组合模式(Composite Pattern)

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Composite 
{ 
         /// <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.Composite 
{ 
         /// <summary> 
         /// 抽象Message实体构件（Component） 
         /// </summary> 
         public  abstract  class MessageModelComponent 
        { 
                 /// <summary> 
                 /// Message实体对象 
                 /// </summary> 
                 protected MessageModel _messageModel; 
 
                 /// <summary> 
                 /// 名称 
                 /// </summary> 
                 protected  string _name; 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="name">名称</param> 
                 /// <param name="mm">Message实体对象</param> 
                 public MessageModelComponent( string name, MessageModel mm) 
                { 
                         this._name = name; 
                         this._messageModel = mm; 
                } 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="name">名称</param> 
                 public MessageModelComponent( string name) 
                { 
                         this._name = name; 
                } 
 
                 /// <summary> 
                 /// 添加 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  abstract  void Add(MessageModelComponent mmc); 
 
                 /// <summary> 
                 /// 删除 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  abstract  void Remove(MessageModelComponent mmc); 
 
                 /// <summary> 
                 /// 获取 
                 /// </summary> 
                 /// <param name="indent">缩进数</param> 
                 /// <returns></returns> 
                 public  abstract  string GetData( int indent); 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Composite 
{ 
         /// <summary> 
         /// Message实体树叶（Leaf） 
         /// </summary> 
         public  class MessageModelLeaf : MessageModelComponent 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="name">名称</param> 
                 /// <param name="mm">Message实体对象</param> 
                 public MessageModelLeaf( string name, MessageModel mm) 
                        :  base(name, mm) 
                { 
                         
                } 
 
                 /// <summary> 
                 /// 添加 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  override  void Add(MessageModelComponent mmc) 
                { 
                         throw  new Exception( "不能添加"); 
                } 
 
                 /// <summary> 
                 /// 删除 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  override  void Remove(MessageModelComponent mmc) 
                { 
                         throw  new Exception( "不能删除"); 
                } 
 
                 /// <summary> 
                 /// 获取 
                 /// </summary> 
                 /// <param name="indent">缩进数</param> 
                 /// <returns></returns> 
                 public  override  string GetData( int indent) 
                { 
                         return  new String('—', indent) +    
                                 "树叶名称：" + _name +    
                                 "；信息内容：" + _messageModel.Message +    
                                 "<br />"; 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.Composite 
{ 
         /// <summary> 
         /// Message实体树枝（Composite） 
         /// </summary> 
         public  class MessageModelComposite : MessageModelComponent 
        { 
                 private List<MessageModelComponent> _list; 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="name">名称</param> 
                 public MessageModelComposite( string name) 
                        :  base(name) 
                { 
                        _list =  new List<MessageModelComponent>(); 
                } 
 
                 /// <summary> 
                 /// 添加 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  override  void Add(MessageModelComponent mmc) 
                { 
                        _list.Add(mmc); 
                } 
 
                 /// <summary> 
                 /// 删除 
                 /// </summary> 
                 /// <param name="mmc">MessageModelComponent</param> 
                 public  override  void Remove(MessageModelComponent mmc) 
                { 
                        _list.Remove(mmc); 
                } 
 
                 /// <summary> 
                 /// 获取 
                 /// </summary> 
                 /// <param name="indent">缩进数</param> 
                 /// <returns></returns> 
                 public  override  string GetData( int indent) 
                { 
                         string s =  new String('—', indent) +    
                                 "树枝名称：" + _name +    
                                 "<br />"; 
 
                         foreach (MessageModelComponent mmc  in _list) 
                        { 
                                s += mmc.GetData(indent + 2); 
                        } 
 
                         return s; 
                } 
        } 
}

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.Composite; 
 
public partial  class Composite : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                MessageModelComposite root =  new MessageModelComposite( "树枝A"); 
 
                root.Add( new MessageModelLeaf( "树叶A",  new MessageModel( "Message内容A", DateTime.Now))); 
                root.Add( new MessageModelLeaf( "树叶B",  new MessageModel( "Message内容B", DateTime.Now))); 
 
                MessageModelComposite comp =  new MessageModelComposite( "树枝B"); 
 
                comp.Add( new MessageModelLeaf( "树叶C",  new MessageModel( "Message内容C", DateTime.Now))); 
                comp.Add( new MessageModelLeaf( "树叶D",  new MessageModel( "Message内容D", DateTime.Now))); 
 
                root.Add(comp); 
 
                root.Add( new MessageModelLeaf( "树叶E",  new MessageModel( "Message内容E", DateTime.Now))); 
 
                MessageModelLeaf l =  new MessageModelLeaf( "树叶F",  new MessageModel( "Message内容F", DateTime.Now)); 
                 
                root.Add(l); 
                root.Remove(l); 
 
                Response.Write(root.GetData(1)); 
        } 
}