无状态
直接在.NET代码中创建状态机和基于轻量级状态机的工作流：
var phoneCall = new StateMachine < State>( State . OffHook );
phoneCall . Configure ( State . OffHook )
. Permit ( Trigger . CallDialled , State . Ringing );
phoneCall . Configure ( State . Connected )
. OnEntry ( t => StartCallTimer ())
. OnExit ( t => StopCallTimer ())
. InternalTransition ( Trigger . MuteMicrophone , t => OnMute ())
