如果解析Json中的某个字段的值
首先我知道可以直接利用写和 Json文件对应的字段实现直接反射，但是由于Json文件返回的字段不稳定，类无法控制这些未知字段，所以我需要override ReadJson方法，未知的字段可以用我自己的逻辑实现了，但是已知的字段无法反射成功了，囧~~

Json文件：
{
  "result_ok": true,
  "total_count": "4",
  "page": 1,
  "total_pages": 1,
  "results_per_page": 50,
  "data": [
  {
  "id": "1",
  "contact_id": "",
  "status": "Complete",
  "is_test_data": "1",
  "datesubmitted": "2011-12-09 02:07:33",
  "[question(2)]": "Victor",
  "[question(4), option(10001)]": "Oral Roberts",
  "[question(4), option(10002)]": "",
  "[question(4), option(10003)]": "Kansas St",
  "[question(4), option(10004)]": "",
  "[question(4), option(10005)]": "Notre Dame",
  "[question(4), option(10007)]": "",
  "[question(4), option(10008)]": "",
  "[question(5)]": "Black pattern",
  "[question(6), option(10012)]": "Logo1.gif",
  "[question(6), option(10013)]": "Logo3.jpg",
  "[question(6), option(10014)]": "",
  "[question(6), option(10016)]": "",
  "[question(8), question_pipe(\": "Man",
  "[question(9), question_pipe(\": "NBA",
  "[question(10), option(10024), question_pipe(\": "",
  "[question(10), option(10025), question_pipe(\": "Muscle",
  "[question(10), option(10026), question_pipe(\": "",
  "[question(10), option(10027), question_pipe(\": "",
  "[question(11)]": "",
  "[question(11), question_pipe(\": "",
  "[question(13)]": "20-99",
  "[question(15)]": "Furniture",
  "[question(16), option(10044)]": "",
  "[question(17)]": "",
  "[question(18), option(10053)]": "",
  "[question(18), option(10054)]": "",
  "[question(18), option(10056)]": "KINWAI",
  "[url(\": "f299f5ef90291d40543fc731bb1fd755",
  "[variable(\": "0",
  "[variable(5)]": "10009",
  "[variable(8)]": "",
  "[variable(8), question_pipe(\": "10017",
  "[variable(9)]": "",
  "[variable(9), question_pipe(\": "10019",
  "[variable(13)]": "10031",
  "[variable(15)]": "10042",
  "[variable(17)]": ""
  }
  ]
}

我写了对应的

实体类：
  [JsonObject(MemberSerialization.OptIn)]
  [JsonConverter(typeof(SurveryResponseConvert