1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 
  6 namespace State
  7 {
  8     class Work
  9     {
 10         private State state;
 11         public Work()
 12         {
 13             this.state = new ForenoonState();
 14         }
 15 
 16         private double hour;
 17         public double Hour
 18         {
 19             get { return hour; }
 20             set { hour = value; }
 21         }
 22 
 23         public void SetState(State s)
 24         {
 25             this.state = s;
 26         }
 27         //为了调用state的行为
 28         public void WriteProgram()
 29         {
 30             state.WriteProgram(this);
 31         }
 32     }
 33     abstract class State
 34     {
 35         public abstract void WriteProgram(Work w);
 36     }
 37     class ForenoonState : State
 38     {
 39         public override void WriteProgram(Work w)
 40         {
 41             if (w.Hour < 12)
 42             {
 43                 Console.WriteLine("当前时间上午{0}点,精神百倍！",w.Hour);
 44             }
 45             else
 46             {
 47                 w.SetState(new NoonState());
 48                 w.WriteProgram();
 49             }
 50         }
 51     }
 52     class NoonState : State
 53     {
 54         public override void WriteProgram(Work w)
 55         {
 56             if (w.Hour < 14)
 57             {
 58                 Console.WriteLine("当前时间中午午{0}点,想睡觉！",w.Hour);
 59             }
 60             else
 61             {
 62                 w.SetState(new AfternoonState());
 63                 w.WriteProgram();
 64             }
 65         }
 66     }
 67     class AfternoonState : State
 68     {
 69         public override void WriteProgram(Work w)
 70         {
 71             if (w.Hour < 18)
 72             {
 73                 Console.WriteLine("当前时间中午午{0}点,快下班了！", w.Hour);
 74             }
 75             else
 76             {
 77                 w.SetState(new SleepingState());
 78                 w.WriteProgram();
 79             }
 80         }
 81     }
 82     class SleepingState : State
 83     {
 84         public override void WriteProgram(Work w)
 85         {
 86             Console.WriteLine("当前时间中午午{0}点,睡着了！", w.Hour);
 87         }
 88     }
 89     class Program
 90     {
 91         static void Main(string[] args)
 92         {
 93             Work w = new Work();
 94             w.Hour = 9;
 95             w.WriteProgram();
 96             w.Hour = 13;
 97             w.WriteProgram();
 98             w.Hour = 17;
 99             w.WriteProgram();
100             w.Hour = 23;
101             w.WriteProgram();
102         }
103     }
104 }