乐在其中设计模式(C#) - 模板方法模式(Template Method Pattern)

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.TemplateMethod 
{ 
         /// <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.TemplateMethod 
{ 
         /// <summary> 
         /// 模板方法抽象类 
         /// </summary> 
         public  abstract  class AbstractMessageTemplate 
        { 
                 /// <summary> 
                 /// UserId 
                 /// </summary> 
                 protected  string _userId; 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 public AbstractMessageTemplate( string userId) 
                { 
                         this._userId = userId; 
                } 
                
                 /// <summary> 
                 /// 验证用户是否合法 
                 /// </summary> 
                 /// <returns></returns> 
                 public  virtual  bool ValidateUser() 
                { 
                         if ( this._userId ==  "admin") 
                        { 
                                 return  true; 
                        } 
                         else 
                        { 
                                 return  false; 
                        } 
                } 
 
                 /// <summary> 
                 /// 获取MessageModel列表 
                 /// </summary> 
                 /// <returns></returns> 
                 public  abstract List<MessageModel> Get(); 
 
                 /// <summary> 
                 /// 模板方法：先验证用户是否合法，再获取MessageModel列表 
                 /// </summary> 
                 /// <returns></returns> 
                 public List<MessageModel> TemplateMethodGet() 
                { 
                         if (ValidateUser()) 
                        { 
                                 return Get(); 
                        } 
                         else 
                        { 
                                List<MessageModel> l =  new List<MessageModel>(); 
                                l.Add( new MessageModel( "无权获取", DateTime.Now)); 
 
                                 return l; 
                        } 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.TemplateMethod 
{ 
         /// <summary> 
         /// Sql方式操作Message 
         /// </summary> 
         public  class SqlMessage : AbstractMessageTemplate 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 public SqlMessage( string userId) 
                        :  base(userId) 
                {    
                } 
 
                 /// <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; 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.TemplateMethod 
{ 
         /// <summary> 
         /// Xml方式操作Message 
         /// </summary> 
         public  class XmlMessage : AbstractMessageTemplate 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 public XmlMessage( string userId) 
                        :  base(userId) 
                { 
                } 
 
                 /// <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; 
                } 
        } 
}

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.TemplateMethod; 
 
public partial  class TemplateMethod : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                AbstractMessageTemplate m =  new XmlMessage( "user"); 
                Response.Write(m.TemplateMethodGet()[0].Message +  " " + m.TemplateMethodGet()[0].PublishTime.ToString()); 
                Response.Write( "<br />"); 
 
                m =  new SqlMessage( "admin"); 
                Response.Write(m.TemplateMethodGet()[0].Message +  " " + m.TemplateMethodGet()[0].PublishTime.ToString()); 
                Response.Write( "<br />"); 
        } 
}

     本文转自webabcd 51CTO博客，原文链接：http://blog.51cto.com/webabcd/344588，如需转载请自行联系原作者