part = new Part()
part.name = "Sample part"
part.price = 123.45
part.save()

var @object = new SomeObject();
var stateMachine = new StateMachine<TriggerEnum, StateEnum>(object);

stateMachine.InitState(StateEnum.NoAction);
stateMachine.Transition(TriggerEnum.TrigerSomething, StateEnum.ActionRunned, (obj, targetState) => Triggered(obj, targetState));

stateMachine.Do(TriggerEnum.TriggerSomething); // output: "Triggered on NoAction"

Console.WriteLine($"Current state: {@object.State.GetDisplay()}"); // output: Current state: ActionRunned

void Triggered(SomeObject obj, StateEnum state)
{
    Console.WriteLine($"Triggered on {obj.State.GetDisplay()}");
    obj.State = state;
}

class SomeObject  
{  
    public static bool operator ==(SomeObject left, object right)  
    {  
        if (right is null)  
        {  
            return true;  
        }  
  
        return false;  
    }  
    public static bool operator !=(SomeObject left, object right)  
    {  
        if (right is null)  
        {  
            return false;  
        }  
  
        return true;  
    }  
}

static void Main(string[] args)  
{  
    var isNullOperator = new SomeObject() == null;  
    var isNullIs = new SomeObject() is null;  
      
    Console.WriteLine($"Вывод через == : {isNullOperator}");  
    Console.WriteLine($"Вывод через is : {isNullIs}");  
}

Вывод через == : True
Вывод через is : False