一个经典实例 － 排序
自定义类 1using System; 2 3namespace Gof.Test.TemplateMethod 4{ 5 public class User 6 { 7 public User(string name,int age) 8 { 9 _name = name;10 _age = age;11 }12 public string Name13 {14 get15 {16 return _name;17 }18 set19 {20 _name = value;21 }22 }23 private string _name;24 public int Age25 {26 get27 {28 return _age;29 }30 set31 {32 _age = value;33 }34 }35 private int _age;3637 }38} 自定义排序类 1 private class MyCustomCompare:System.Collections.IComparer 2 { 3 IComparer 成员#region IComparer 成员 4 5 public int Compare(object x, object y) 6 { 7 User userx = (User)x; 8 User usery = (User)y; 9 int result = 0;10 if(userx.Age > usery.Age)11 {12 result = -1;13 }14 if(userx.Age == usery.Age)15 {16 result = 0;17 }18 if(userx.Age < usery.Age)19 {20 result = 1;21 }22 return result;23 }2425 #endregion 26 } 客户代码 1 User user = new User("nan",20); 2 User user2 = new User("shou",19); 3 User user3 = new User("yong",18); 4 User[] users = new User[]{user,user2,user3}; 5 Array.Sort(users,new MyCustomCompare()); 6 foreach(User u in users) 7 { 8 Console.WriteLine(u.Name); 9 }10 Console.ReadLine(); 重构为模板 Machine类层次 1using System; 2using Gof.Test.Factory.Plan; 3 4namespace Gof.Test.Factory.Machines 5{ 6 public class Machine 7 { 8 public Machine() 9 {10 }11 public bool HasDone12 {13 get14 {15 return _hasDone;16 }17 set18 {19 _hasDone = value;20 }21 }private bool _hasDone;2223 public virtual MachinePlanner CreatePlanner()24 {25 return new BasicPlanner(this);26 }27 public MachinePlanner GetPlanner()28 {29 if(_planner == null)30 {31 _planner = CreatePlanner();//这里是多态的32 }33 return _planner;34 }private MachinePlanner _planner; //抽象出来，形成模板35 }36} Fuser 1using System; 2using Gof.Test.Factory.Plan; 3 4namespace Gof.Test.Factory.Machines 5{ 6 public class Fuser:Machine 7 { 8 public Fuser() 9 {10 }11 public override MachinePlanner CreatePlanner()12 {13 return new FuserPlanner(this);14 }15// private MachinePlanner GetPlanner()16// {17// if(_planner == null)18// {19// _planner = new FuserPlanner(this);20// }21// return _planner;22// }private MachinePlanner _planner;//重构掉了23 }24}25 Mixer 1using System; 2using Gof.Test.Factory.Plan; 3 4 5namespace Gof.Test.Factory.Machines 6{ 7 public class Mixer : Machine 8 { 9 public Mixer()10 {11 }12 public override MachinePlanner CreatePlanner()13 {14 return new MixerPlanner(this);15 }16// private MachinePlanner GetPlanner()17// {18// if(_planner == null)19// {20// _planner = new MixerPlanner(this);21// }22// return _planner;23// }private MachinePlanner _planner;24 }25} MachinePlanner类层次 1using System; 2using Gof.Test.Factory.Machines; 3 4namespace Gof.Test.Factory.Plan 5{ 6 public abstract class MachinePlanner 7 { 8 public MachinePlanner(Machine machine) 9 {10 _machine = machine;11 }12 public Machine Machine13 {14 get15 {16 return _machine;17 }18 }19 private Machine _machine;20 public abstract bool ContineWork21 {22 get;23 }24 }25} BasicPlanner 1using System; 2using Gof.Test.Factory.Machines; 3 4namespace Gof.Test.Factory.Plan 5{ 6 public class BasicPlanner:MachinePlanner 7 { 8 public BasicPlanner(Machine machine) : base(machine) 9 {10 }11 public override bool ContineWork12 {13 get14 {15 return Machine.HasDone;16 }17 }18 }19} FuserPlanner 1using System; 2using Gof.Test.Factory.Machines; 3 4namespace Gof.Test.Factory.Plan 5{ 6 /**//// <summary> 7 /// FuserPlanner 的摘要说明。 8 /// </summary> 9 public class FuserPlanner:MachinePlanner10 {11 public FuserPlanner(Machine machine):base(machine)12 {13 }14 public override bool ContineWork15 {16 get17 {18 return Machine.HasDone;19 }20 }21 }22} MixerPlanner 1using System; 2using Gof.Test.Factory.Machines; 3 4namespace Gof.Test.Factory.Plan 5{ 6 public class MixerPlanner : MachinePlanner 7 { 8 public MixerPlanner(Machine machine) : base(machine) 9 {10 }11 public override bool ContineWork12 {13 get14 {15 return Machine.HasDone;16 }17 }1819 }20} The Template Method Pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure.转载于:https://www.cnblogs.com/nanshouyong326/archive/2007/01/10/616594.html
