在類別A下新增List<?> data {get;set;}
由於各類別結構不同，這個List<?>的類別(class)就不曉得該如何填入
要保持json的結構一致的話沒辦法指定各類別的結構並將data更名(無法共用物件名稱data，還是可以？)

泛型呢?
官方文件

interface IInterface
        {
            string Id { get; set; }
            int Type { get; set; }
        }

        class AClass<T> : IInterface
        {
            public DateTime Date { get; set; }

            public string Id { get; set; }
            public int Type { get; set; }

            public T Data { get; set; }
        }

        class BClass
        {
            public string str = "IsBClass";
        }
        class CClass
        {
            public string str = "IsCClass";
        }

AClass<BClass> bClass = new AClass<BClass>
            {
                Id = "B",
                Type = 1,
                Date = DateTime.Now,
                Data = new BClass()
            };

            AClass<CClass> cClass = new AClass<CClass>
            {
                Id = "c",
                Type = 2,
                Date = DateTime.Now,
                Data = new CClass()
            };

            string bJson = JsonConvert.SerializeObject(bClass);
            string cJson = JsonConvert.SerializeObject(cClass);
            Console.WriteLine(bJson);
            Console.WriteLine(cJson);

            AClass<BClass> newBClass = JsonConvert.DeserializeObject<AClass<BClass>>(bJson);
            AClass<CClass> newCClass = JsonConvert.DeserializeObject<AClass<CClass>>(cJson);