c#:反序列化JSON

我有一个问题与反序列化JSON

这是我的JSON文件

{
  "api_result": 1,
  "api_result_msg": "OK",
  "api_data": {
    "api_basic": {
      "api_nickname": "David",
    },
    "api_p_bgm_id": 112,
    "api_parallel_quest_count": 5
  }
}

匹配类(在visual studio中通过特殊粘贴生成):

public class Rootobject
{
    public int api_result { get; set; }
    public string api_result_msg { get; set; }
    public Api_Data api_data { get; set; }
}
public class Api_Data
{
    public Api_Basic api_basic { get; set; }
    public int api_p_bgm_id { get; set; }
    public int api_parallel_quest_count { get; set; }
}
public class Api_Basic
{
    public string api_nickname { get; set; }
}

和我的代码:

    string JJ = "{'"api_result'":1,'"api_result_msg'":'"OK'",'"api_data'":{'"api_basic'":{'"api_nickname'":'"David'"},'"api_p_bgm_id'":112,'"api_parallel_quest_count'":5}}";
    Rootobject result = JsonConvert.DeserializeObject<Rootobject>(JJ);
    Api_Basic nickname = JsonConvert.DeserializeObject<Api_Basic>(JJ);
    Console.WriteLine("result:" + result.api_result_msg);
    Console.WriteLine("nickname:" + nickname.api_nickname);

输出:

result:OK <---success
nickname: <---fail

我试着:

Rootobject nickname = JsonConvert.DeserializeObject<Rootobject>(JJ);
Console.WriteLine(nickname.api_basic.api_nickname);

但是这行不通。

我做错了什么?

string JJ = "{'"api_result'":1,'"api_result_msg'":'"OK'",'"api_data'":{'"api_basic'":{'"api_nickname'":'"David'"},'"api_p_bgm_id'":112,'"api_parallel_quest_count'":5}}";
Rootobject result = JsonConvert.DeserializeObject<Rootobject>(JJ);
Console.WriteLine("result:" + result.api_result_msg);
Console.WriteLine("nickname:" + result.api_data.api_basic.api_nickname);