jobject,jobject 遍历

通过JObject和JArray创建JSON对象
我们先用非常简单的方法来动态创建一些JSON，可通过JToken派生的JSON.NET对象来进行，最常见的JToken派生的类是JObject和JArray。

正是因为JToken实现了IDynamicMetaProvider动态语言接口，所以可以使用dynamic关键字直观地创建动态对象，并把这个动态对象序列化为JSON字符串。 我们通过JArray和JObject来创建一个示例：

[TestMethod]
public void JObjectOutputTest()
{
    // strong type instance
    var jsonObject = new JObject();

    // you can explicitly add values here
    jsonObject.Add("Entered", DateTime.Now);

    // dynamic expando instance you can add properties to
    dynamic album = jsonObject;

    album.AlbumName = "Dirty Deeds Done Dirt Cheap";
    album.Artist = "AC/DC";
    album.YearReleased = 1976;

    album.Songs = new JArray() as dynamic;

    dynamic song = new JObject();
    song.SongName = "Dirty Deeds Done Dirt Cheap";
    song.SongLength = "4:11";
    album.Songs.Add(song);

    song = new JObject();
    song.SongName = "Love at First Feel";
    song.SongLength = "3:10";
    album.Songs.Add(song);

    Console.WriteLine(album.ToString());
}
运行上面的示例代码，就能形成以下结构的JSON内容：

{
    "Entered": "2012-08-18T13:26:37.7137482-10:00",
    "AlbumName": "Dirty Deeds Done Dirt Cheap",
    "Artist": "AC/DC",
    "YearReleased": 1976,
    "Songs": [
   {
       "SongName": "Dirty Deeds Done Dirt Cheap",
       "SongLength": "4:11"
   },
   {
       "SongName": "Love at First Feel",
       "SongLength": "3:10"
   }
 ]
}

C#给JSON对象添加一个键值对
        /// <summary>添加一个属性
        /// 
        /// </summary>
        /// <param name="obj">待添加属性的对象</param>
        /// <param name="key">键名</param>
        /// <param name="value">值</param>
        /// <returns>添加属性后的对象</returns>
        public static object Add(object obj, string key, object value)
        {
            JObject jObj = JObject.Parse(JsonConvert.SerializeObject(obj));
            jObj.Add(new JProperty(key, value));
            return JsonConvert.DeserializeObject(jObj.ToString());
        }