CSharp: State Pattern in donet core 3

 

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/// <summary>   /// 状态模式 State Pattern   /// geovindu, Geovin Du edit   /// </summary>   interface IPossibleStates   {       //Users can press any of these buttons-On, Off or Mute       /// <summary>       ///       /// </summary>       /// <param name="context"></param>       void PressOnButton(TV context);       /// <summary>       ///       /// </summary>       /// <param name="context"></param>       void PressOffButton(TV context);       /// <summary>       ///       /// </summary>       /// <param name="context"></param>       void PressMuteButton(TV context);   }   //Subclasses does not contain any local state.   //Only one unique instance of IPossibleStates is required.   /// <summary>   /// Off state behavior   /// 关状态行为   /// </summary>   class Off : IPossibleStates   {       /// <summary>       /// 关       /// </summary>       public Off()       {           Console.WriteLine("---电视现在是关的 TV is Off now.---\n");       }         /// <summary>       /// TV is Off now, user is pressing On button       /// 现在电视是关闭的，用户正在按开按钮       /// 下一个开按钮       /// </summary>       /// <param name="context"></param>       public void PressOnButton(TV context)       {           Console.WriteLine("TV was Off电视是关的.Going from Off to On state.是从关状态至开的状诚");           context.CurrentState = new On();       }       /// <summary>       /// TV is Off already, user is pressing Off button again       /// 现在电视是关闭的，用户正在按打开按钮电视是关闭的，用户正在按关闭按钮再次       /// </summary>       /// <param name="context"></param>       public void PressOffButton(TV context)       {           Console.WriteLine("TV was already in Off state现在电视是关闭状态.So, ignoring this opeation.所以，忽略这个操作");       }       /// <summary>       /// TV is Off now, user is pressing Mute button       /// 电视关闭，用户按静音键       /// </summary>       /// <param name="context"></param>       public void PressMuteButton(TV context)       {           Console.WriteLine("TV was already off.电视已经关闭 So, ignoring this operation.所以，可以忽略这个操作");       }   }   /// <summary>   /// On state behavior   /// 开状态行为   /// </summary>   class On : IPossibleStates   {       /// <summary>       ///       /// </summary>       public On()       {           Console.WriteLine("---电视现在是开的。TV is On now.---\n");       }       //Users can press any of these buttons at this state-On, Off or Mute       //TV is On already, user is pressing On button again       public void PressOnButton(TV context)       {           Console.WriteLine("TV is already in On state.电视已经是开的状诚。Ignoring repeated on button press operation.忽略重复按下按钮操作");       }       //TV is On now, user is pressing Off button       public void PressOffButton(TV context)       {           Console.WriteLine("TV was on.现在电视是开的，So,switching off the TV.所以，可以正当关掉电视");           context.CurrentState = new Off();       }       //TV is On now, user is pressing Mute button       public void PressMuteButton(TV context)       {           Console.WriteLine("TV was on.现在电视是开状态。So,moving to silent mode.所以，切换到静音模式");           context.CurrentState = new Mute();       }   }   /// <summary>   /// Mute state behavior   /// 静音状态行为   /// </summary>   class Mute : IPossibleStates   {         public Mute()       {           Console.WriteLine("---电视现在是静音模式 TV is in Mute mode now.---\n");       }       //Users can press any of these buttons at this state-On, Off or Mute       //TV is in mute, user is pressing On button       public void PressOnButton(TV context)       {           Console.WriteLine("TV was in mute mode.现在是静音模式，So, moving to normal state.那么，可以转换为正常状态");           context.CurrentState = new On();       }       //TV is in mute, user is pressing Off button       public void PressOffButton(TV context)       {           Console.WriteLine("TV was in mute mode.现在是静音模式 So, switching off the TV.那么，现在可以关闭电视。");           context.CurrentState = new Off();       }       //TV is in mute already, user is pressing mute button again       public void PressMuteButton(TV context)       {           Console.WriteLine(" TV is already in Mute mode,电视已经处于静音状态 so, ignoring this operation.那么，可以忽略这个操作");       }   }   /// <summary>   /// TV is the context class   /// 电视对象   /// </summary>   class TV   {       /// <summary>       ///       /// </summary>       private IPossibleStates currentState;       /// <summary>       ///       /// </summary>       public IPossibleStates CurrentState       {           get           {               return currentState;           }           /*            * Usually this value will be set by the class that             implements the interface "IPossibleStates"             */           set           {               currentState = value;           }       }       /// <summary>       ///       /// </summary>       public TV()       {           //Starting with Off state           this.currentState = new Off();       }       /// <summary>       ///       /// </summary>       public void ExecuteOffButton()       {           Console.WriteLine("你按下“关闭”按钮.");           //Delegating the state behavior           currentState.PressOffButton(this);       }       /// <summary>       ///       /// </summary>       public void ExecuteOnButton()       {           Console.WriteLine("你按下“打开”按钮.");           //Delegating the state behavior           currentState.PressOnButton(this);       }       /// <summary>       ///       /// </summary>       public void ExecuteMuteButton()       {           Console.WriteLine("您按了静音键.");           //Delegating the state behavior           currentState.PressMuteButton(this);       }   }

　　

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/// <summary>   /// 状态模式 State Pattern   /// geovindu, Geovin Du edit   /// </summary>   public class DuProgram   {       public enum Trigger       {           On, Off       }   }   /// <summary>   ///   /// </summary>   public enum State   {       OffHook,       CallDialed,       Ringing,       OnHold,       OnHook   }

　　

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/// <summary>  /// 状态模式 State Pattern  /// geovindu, Geovin Du edit  /// </summary>  public enum Chest  {      Open, Closed, Locked  }    /// <summary>  ///  /// </summary>  public enum Action  {      Open, Close  }  /// <summary>  ///  /// </summary>  public class SwitchExpressions  {        /// <summary>      ///      /// </summary>      /// <param name="chest"></param>      /// <param name="action"></param>      /// <param name="haveKey"></param>      /// <returns></returns>     public static Chest Manipulate(Chest chest,        Action action, bool haveKey) =>        (chest, action, haveKey) switch        {            (Chest.Closed, Action.Open, _) => Chest.Open,            (Chest.Locked, Action.Open, true) => Chest.Open,            (Chest.Open, Action.Close, true) => Chest.Locked,            (Chest.Open, Action.Close, false) => Chest.Closed,              _ => chest        };      /// <summary>      ///      /// </summary>      /// <param name="chest"></param>      /// <param name="action"></param>      /// <param name="haveKey"></param>      /// <returns></returns>      public static Chest Manipulate2(Chest chest,        Action action, bool haveKey)      {                     switch (chest, action, haveKey)          {              case (Chest.Closed, Action.Open, _):                  return Chest.Open;              case (Chest.Locked, Action.Open, true):                  return Chest.Open;              case (Chest.Open, Action.Close, true):                  return Chest.Locked;              case (Chest.Open, Action.Close, false):                  return Chest.Closed;              default:                  Console.WriteLine("Chest unchanged");                  return chest;          }      }  }

　　

调用：

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//状态模式        Console.WriteLine("***状态模式 State Pattern Demo***\n");        //TV is initialized with Off state.        TV tv = new TV();        Console.WriteLine("用户按以下顺序按按钮:");        Console.WriteLine("Off->Mute->On->On->Mute->Mute->Off\n");        //TV is already in Off state        tv.ExecuteOffButton();        //TV is already in Off state, still pressing the Mute button        tv.ExecuteMuteButton();        //Making the TV on        tv.ExecuteOnButton();        //TV is already in On state, pressing On button again        tv.ExecuteOnButton();        //Putting the TV in Mute mode        tv.ExecuteMuteButton();        //TV is already in Mute, pressing Mute button again        tv.ExecuteMuteButton();        //Making the TV off        tv.ExecuteOffButton();          Console.WriteLine();          // false = off, true = on          var light = new StateMachine<bool, DuProgram.Trigger>(false)；////引用了 https://github.com/dotnet-state-machine/stateless          light.Configure(false) // if the light is off...          .Permit(DuProgram.Trigger.On, true)  // we can turn it on          .OnEntry(transition =>          {              if (transition.IsReentry)                  Console.WriteLine("Light is already off!");              else                  Console.WriteLine("Switching light off");          })          .PermitReentry(DuProgram.Trigger.Off);        // .Ignore(Trigger.Off) // but if it's already off we do nothing          // same for when the light is on        light.Configure(true)          .Permit(DuProgram.Trigger.Off, false)          .OnEntry(() => Console.WriteLine("Turning light on"))          .Ignore(DuProgram.Trigger.On);          light.Fire(DuProgram.Trigger.On);  // Turning light on        light.Fire(DuProgram.Trigger.Off); // Turning light off        light.Fire(DuProgram.Trigger.Off); // Light is already off!        Console.WriteLine();          //        Chest chest = Chest.Locked;        Console.WriteLine($"Chest is {chest}");          // unlock with key        chest = SwitchExpressions.Manipulate(chest, Action.Open, true);        Console.WriteLine($"Chest is now {chest}");          // close it!        chest = SwitchExpressions.Manipulate(chest, Action.Close, false);        Console.WriteLine($"Chest is now {chest}");          // close it again!        chest = SwitchExpressions.Manipulate(chest, Action.Close, false);        Console.WriteLine($"Chest is now {chest}");

　　

输出：

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***状态模式 State Pattern Demo***   ---电视现在是关的 TV is Off now.---   用户按以下顺序按按钮: Off->Mute->On->On->Mute->Mute->Off   你按下“关闭”按钮. TV was already in Off state现在电视是关闭状态.So, ignoring this opeation.所以，忽略这个操作 您按了静音键. TV was already off.电视已经关闭 So, ignoring this operation.所以，可以忽略这个操作 你按下“打开”按钮. TV was Off电视是关的.Going from Off to On state.是从关状态至开的状诚 ---电视现在是开的。TV is On now.---   你按下“打开”按钮. TV is already in On state.电视已经是开的状诚。Ignoring repeated on button press operation.忽略重复按下按钮操作 您按了静音键. TV was on.现在电视是开状态。So,moving to silent mode.所以，切换到静音模式 ---电视现在是静音模式 TV is in Mute mode now.---   您按了静音键.  TV is already in Mute mode,电视已经处于静音状态 so, ignoring this operation.那么，可以忽略这个操作 你按下“关闭”按钮. TV was in mute mode.现在是静音模式 So, switching off the TV.那么，现在可以关闭电视。 ---电视现在是关的 TV is Off now.---     Turning light on Switching light off Light is already off!   Chest is Locked Chest is now Open Chest is now Closed Chest is now Closed