using System;

using System.Text.RegularExpressions;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var json = "{ id: 1, cnj: \"1500312-82.2019.8.26.0050\" }";

        var teste = JsonConvert.DeserializeObject<Teste>(json);

        Console.WriteLine(json);

        json = JsonConvert.SerializeObject(teste);

        Console.WriteLine(json);

    }

    public class Teste {

        public int Id { get; set; }

        public ConselhoNacionalJustica CNJ { get; set; }

    }

    public class ConselhoNacionalJustica

    {

        private const string NumeroMascara = @"{0:0000000}-{1:00}.{2:0000}.{3:0}.{4:00}.{5:0000}";

        private static readonly Regex NumeroExpression = new Regex(@"(?<Numero>\d*)-(?<Digito>\d*).(?<Ano>\d*).(?<Orgao>\d*).(?<Tribunal>\d*).(?<Origem>\d*)");

​

        public static implicit operator string(ConselhoNacionalJustica value) => value.ToString();

        public static implicit operator ConselhoNacionalJustica(string value) => new ConselhoNacionalJustica(value);

​

        public int Numero { get; set; }

        public int Digito { get; set; }

        public int Ano { get; set; }

        public int Orgao { get; set; }

        public int Tribunal { get; set; }

        public int Origem { get; set; }

​

        public ConselhoNacionalJustica() { }

​

        private ConselhoNacionalJustica(string value): this()

        {

            if (NumeroExpression.IsMatch(value))

            {

                var match = NumeroExpression.Match(value).Groups;

                this.Numero = int.Parse(match[nameof(Numero)].Value);

                this.Digito = int.Parse(match[nameof(Digito)].Value);

                this.Ano = int.Parse(match[nameof(Ano)].Value);

                this.Orgao = int.Parse(match[nameof(Orgao)].Value);

                this.Tribunal = int.Parse(match[nameof(Tribunal)].Value);

                this.Origem = int.Parse(match[nameof(Origem)].Value);

            }

        }

​

        public override string ToString()

        {

            return string.Format(NumeroMascara, Numero, Digito, Ano, Orgao, Tribunal, Origem);

        }

    }

}