/// <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);
}
}
/// <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
}
/// <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：
//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：
***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