更新：

我选择了Nicholas Blumhardt创造的stateless.这是一种非常简单的方法来对域中的状态进行建模.以下是google提供的示例代码：

var phoneCall = new StateMachine<State,Trigger>(State.OffHook);

phoneCall.Configure(State.OffHook)
    .Allow(Trigger.CallDialed,State.Ringing);

phoneCall.Configure(State.Ringing)
    .Allow(Trigger.HungUp,State.OffHook)
    .Allow(Trigger.CallConnected,State.Connected);

phoneCall.Configure(State.Connected)
    .OnEntry(t => StartCallTimer())
    .OnExit(t => StopCallTimer())
    .Allow(Trigger.LeftMessage,State.OffHook)
    .Allow(Trigger.HungUp,State.OffHook)
    .Allow(Trigger.PlacedOnHold,State.OnHold);

phoneCall.Configure(State.OnHold)
    .SubstateOf(State.Connected)
    .Allow(Trigger.TakenOffHold,State.Connected)
    .Allow(Trigger.HungUp,State.OffHook)
    .Allow(Trigger.PhoneHurledAgainstWall,State.PhoneDestroyed);

如您所见,状态机使用泛型来对状态及其各自的触发器进行建模.换句话说,您可以使用枚举,整数,字符串等来满足您的需求.状态机的每个状态都可以配置条件触发器,这些条件触发器将根据特定条件触发.