private delegate int delStepDoSomething(object obj=null);
private static Dictionary<int , delStepDoSomething> stepDoSomething = new Dictionary<int , delStepDoSomething>();
private static Dictionary<int, Func<object,int>> stepDoSomething = new Dictionary<int,Func<object, int>>();
1.注意，上面2中方式的委托。都可以与字典绑定
2.Func作为委托，其参数没办法，给默认值。