关于Newtonsoft.Json解析json字符串

最近遇到了一个解析json字符串的问题。由于嵌套的节点较多，刚开始通过遍历的方式去获取，但是遍历首先就是逻辑麻烦，然后想要你需要的东西可能会比较困难。后面发现json的节点是不变的，那么可以通过JsonConvert将json字符串转成指定的model，而这个model所含有的字段要和字符串中的节点一样，如果节点下还有嵌套的，那么再将此节点写成一个model，依次类推。

有这样一个字符串：

{
    "message": {
        "event_type": "transcodeComplete",
        "transcode_info": {
            "title": "title",
            "status": "SUCCEED",
            "template_group_name": "mp4_adptive_template_group",
            "output": [
                {
                    "play_type": "MP4",
                    "url": "https://www.baidu.com",
                    "encrypted": 0,
                    "meta_data": {
                        "play_type": 0,
                        "codec": "H.264",
                        "duration": 57,
                        "video_size": 18359296,
                        "width": 1280,
                        "hight": 720,
                        "bit_rate": 2499,
                        "frame_rate": 0,
                        "audio_channels": 0
                    }
                }
            ],
            "asset_id": "3ada15adc1df40ce0b2a7f98c35ca2de"
        }
    }
}

　　我们可以将其写成几个model，一个大的model，msg，包含所有信息，就叫message吧。其下还有transcode_info，transcode_info下还有output，记住，output是一个数组，需要用list来存储，output下还有meta_data。就这样。记住：名称必须和节点名称一致！名称必须和节点名称一致！名称必须和节点名称一致！

下面开始:

Message:

public class Message
   {
       /// <summary>
       /// 
       /// </summary>
       public string event_type { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public Transcode_info transcode_info { get; set; }
   }

　　Transcode_info

public class Transcode_info
  {
 
      /// <summary>
      /// 
      /// </summary>
      public string title { get; set; }
      /// <summary>
      /// 
      /// </summary>
      public string asset_id { get; set; }
      /// <summary>
      ///
      /// </summary>
      public string status { get; set; }
      /// <summary>
      /// 
      /// </summary>
      public string templateGroupName { get; set; }
      /// <summary>
      /// 
      /// </summary>
      public List<OutputItem> output { get; set; }
      /// <summary>
      /// 
      /// </summary>
      public string error_code { get; set; }
 
      /// <summary>
      /// 
      /// </summary>
      public string error_msg { get; set; }
  }

　　Output

public class OutputItem
   {
       /// <summary>
       /// 
       /// </summary>
       public string play_type { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public string url { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int encrypted { get; set; }
 
       /// <summary>
       /// 
       /// </summary>
       public string quality { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public meta_data meta_data { get; set; }
   }

　　meta_data：

public class meta_data
   {
       /// <summary>
       /// 
       /// </summary>
       public int play_type { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public string codec { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int duration { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int video_size { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int width { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int hight { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int bit_rate { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int frame_rate { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int quality { get; set; }
       /// <summary>
       /// 
       /// </summary>
       public int audio_channels { get; set; }
   }