JSON 定义实体类，回个人解答一下吧

JSON 定义实体类，来个人解答一下吧。
示例： 
{
     "button":[
     {
          "type":"click",
          "name":"今日歌曲",
          "key":"V1001_TODAY_MUSIC"
      },
      {
           "type":"click",
           "name":"歌手简介",
           "key":"V1001_TODAY_SINGER"
      },
      {
           "name":"菜单",
           "sub_button":[
           {
               "type":"view",
               "name":"搜索",
               "url":"http://www.soso.com/"
            },
            {
               "type":"view",
               "name":"视频",
               "url":"http://v.qq.com/"
            },
            {
               "type":"click",
               "name":"赞一下我们",
               "key":"V1001_GOOD"
            }]
       }]
 }
我定义的实体类：
 [Serializable]
    public class Menu
    {
        public Button[] button;
        //public Sub_button[] sub_button;
    }

    [Serializable]
    public class Button
    {
        public string type = "click";
        public string name;
        public string key;
        public Sub_button[] sub_button;
     //   public List<Buttont> sub_button;
    //    public string url;
    }

    [Serializable]
    public class Sub_button
    {
        public string type = "view";
        public string name;
        public string url;
    }

实体类赋值：
           Menu menu = new Menu()
            {
                //  一级菜单赋值
                button = new Button[]
                {
                        new Button(){name=txtMenuLeftOne.Text,key="V1001_1"},
                        new Button(){name=txtMenuCentenOne.Text,key="V1001_02"},
                        new Button(){name=txtMenuRightOne.Text,key="V1001_3"},
                        new Button()
                        {
                                name="菜单",sub_button=new Sub_button[]
                                {
                                        //左边二级菜单赋值