using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var carInfo = new CarsModel

    {

        OnStock = 100,

        Cars = new CarInfo[]

        {

            new CarInfo

            {

                Details = new CarDetails{ CarId=2},

                ServiceInfo = new ServiceInfo

                {

                    LastService = DateTime.Now

                },

                MarketingInfoDetails = new MarketingInfo

                {

                    ContactPerson = "John Doe"

                },

                SerializeDetails = false,

            },

            new CarInfo

            {

                Details = new CarDetails{ CarId=2},

                ServiceInfo = new ServiceInfo

                {

                    LastService = DateTime.Now

                },

                MarketingInfoDetails = new MarketingInfo

                {

                    ContactPerson = "John Doe"

                },

                SerializeMarketingInfoDetails = false

            }

        }.ToList(),

    };

    JsonConvert.SerializeObject(carInfo,Formatting.Indented).Dump();

    }

}

​

​

public class CarsModel

{        

    public int OnStock { get; set; }

    public int Rented { get; set; }

    public List<CarInfo> Cars { get; set; }

}

public class CarInfo

{

    [JsonIgnore]

    public bool SerializeDetails{get;set;} = true;

    public bool ShouldSerializeDetails() =>SerializeDetails;

   [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

    public CarDetails Details { get; set; }

​

    [JsonIgnore]

    public bool ShouldSerializeServiceInfo{get;set;}

   [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

   public ServiceInfo ServiceInfo { get; set; }

​

    [JsonIgnore]

    public bool SerializeMarketingInfoDetails{get;set;} = true;

    public bool ShouldSerializeMarketingInfoDetails() =>SerializeMarketingInfoDetails;

   [JsonProperty( NullValueHandling = NullValueHandling.Ignore)]

   public MarketingInfo MarketingInfoDetails { get; set; }

 }  

​

​

public class CarDetails

{

    public int CarId{get;set;}

}

​

public class ServiceInfo

{

    public DateTime LastService{get;set;}

}

​

public class MarketingInfo

{

    public string ContactPerson{get;set;}

}