C#. json. How to get array elements from an array?

Question

JSON

json file

{
  "ts":123456,
  "pts":123,
  "updates":
}

I get a line like:

string json = "{\"ts\":1645337136,\"pts\":105,\"updates\":}\r\n";

It is necessary to extract the first "First" and the last "Text" element from the array, which is located in the "updates"
array. I used the Json.net library, I managed to extract only the ts and pts values.

using System;
using Newtonsoft.Json;

class Events                                
    {
        public string ts { get; set; }
        public string pts { get; set; }
    }
static void Main(string[] args)
   {
string json = ""{\"ts\":123456,\"pts\":123,\"updates\":}\r\n";
Events events = JsonConvert.DeserializeObject<Events>(json);
   }

I can't figure out how to describe the json structure itself in the class and how to work with it.
Please help.

Answer 1

class Events                                
    {
        public string ts { get; set; }
        public string pts { get; set; }
        public object[][] updates {get;set;}
    }
...
Events events = JsonConvert.DeserializeObject<Events>(json);
var first = events.updates.FirstOrDefault(f=>f!=null&&f[0]=="First");//получение первого массива содержащего слово "First"
var text = events.updates.FirstOrDefault(f=>!(f!=null&&f.Any(a=>a=="Text")))//получение массива в котором есть "Text"
if(text==null)
    throw new ArgumentException(...);
var textIndex = text.TakeWhile(w=>!(w=="Text")).Count();//получение индекса в массиве для слова "Text"
 ...