回複：有人能答出這到.NET的題嗎？非常TRICKY喲

如果不改MyClass, 可用 Reflection/Delegate. Some Delegate sample:

MyDel del = (MyDel)Delegate.CreateDelegate(typeof(MyDel),new MyClass.Animal(), "Eat");
del.GetType().BaseType.GetField("_target", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(del,null);
del();