using System;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"{'14500001':{'2019':{'02':'59.12'}},'14500004':{'2019':{'02':'0'}}}";

​

        JObject o = JObject.Parse(json);

        foreach (var item in o.Properties()){

            Console.WriteLine(item.Name);

            var test = item.Value.ToString();

            JObject x = JObject.Parse(test);

            var pippo = x.Properties().First();

            JObject y = JObject.Parse(pippo.Value.ToString());

            Console.WriteLine(y.Properties().First().Value);

        }

    }

}