一杯咖啡带你读懂状态机

abstract class State
{
    public abstract void Handle(Context context) ; 
}

class Context
{
    private State state;
    public Context (State state)        # 定义 Context的初始状态
    {
        this.state = state;
    }
    public State State        # 可读写的状态属性，用于读取当前状态和设置新状态
    {
        get ( return state ;)
        set
        {
  
            state = value;
            Console.WriteLine("当前状态：" + state.GetType().Name);
        }
    }
    public void Request()
    {
        state.Handle(this);            # 对请求做处理，并设置下一状态
    }
}                

state void Main (string[] args)
{
     Context c  = new Context(new ConcreteStateA());     # 设置Context的初始状态为ConcreteStateA

    c.Request();
    c.Request();
    c.Request();
    c.Request();            # 不断请求，同事更改状态


    
    Console.Read();
}

public abstract class State
{
    public abstract void WriteProgram(Work w);
}

pulic class ForenoonState : State
{
    public override void WriteProgram  (Work w)
    {
        if (w.Hour < 12) {
             Console.WriteLine("当前时间： {0}点 上午工作，精神百倍",w.Hour);
        }
        else
        {
             w.SetState(new NoonState());w.WriteProgram();
             # 超过12点，则转入中午工作状态
        }
    }
}

public class NoonState : State
{
    public override void WriteProgram(Work w)
   {
        if (w.Hour < 13){
            Console.WriteLine("当前时间： {0}点 饿了，午饭：犯困，午休。", w.Hour);
       }
       else
        {
             w.SetState (new AfternoonState());w.WriteProgram();
              # 超过13点则转入下午工作状态
        }
    }
}

public class AfternoonState : State
{
    public override void WriteProgram (Work w)
    {
     if (w.Hour < 17)
     {
          Console.WriteLine("当前时间：{0}点 下午状态还不错，继续努力", w.Hour;)
     }
     else
      {
           w.SetState(new EveningState());
           # 超过17点，则转入傍晚工作状态
           w.WriteProgram();
      }
    }
}

public class EveningState : State
{
    public override void WriteProgram(Work w)
    {
         if (w.TaskFinished)
         {
              w.SetState(new RestState());
               # 如果完成任务，则转入下班状态
              w.WriteProgram();
         }
         else
         {
              w.SetState(new SleepingState()); w.WriteProgram();
             # 超过21点，则转入睡眠工作状态  
         }
    }
}

public class SleepingState : State
{
    public override void WriteProgram(Work w)
    {
        Console.WriteLine("当前时间：{0}点不行了，睡着了。", w.Hour);
    }
}

public class RestState : State
{
    public override void WriteProgram(Work w)
    {

        Console.WriteLine("当前时间：{0}点下班回家了", w.Hour);
    }
}

public class Work
{
    private State current;
    public Work()
    # 工作初始化为上午工作状态，即上午9点开始上班
    {
         current = new ForenoonState();
    }
    private double hour；
    public double Hour
   {# 终点属性，状态转换的依据
        get{return hour;}
        set{hour = value;}
    }
    private bool finish = false;
    public bool TaskFinished
    {# 任务完成属性，是否能下班的依据
         get{return finish}
         set{finish= value}
    }
    public void SetState(State s)
    {
        current = s;
    }
    public void WriteProgram()
    {
        current.WriteProgram(this);
    }

}

static void Main(string[] args);
{
    //紧急项目
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 9;
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 10;
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 12;
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 13;
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 14;
    Work emergencyProjects = new Work();
    energencyProjects.Hour = 17;


     //emergencyProjects.WorkFinished = true;
    emergencyProjects.WorkFinished = false;

    Work emergencyProjects = new Work();
    energencyProjects.Hour = 19;

    Work emergencyProjects = new Work();
    energencyProjects.Hour = 22;

    Console.Read();
    
}