using System;

using System.Text.Json;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Storage storage = new Storage()

        {

            Stations = new Station[3]

        };

        for(int i = 0; i<storage.Stations.Length; i++)

        {

            Station station = new Station(){

                StationId = i,

                Coil = new Coil()

                {

                    CoilId = i,

                    Material = new Material()

                }

            };

            storage.Stations[i] = station;

        }

        string json = JsonSerializer.Serialize(storage);

        Console.WriteLine(json);

    }

}

​

public class Storage

{

    public Station[] Stations {get;set;}

}

​

public class Station

{

    public int StationId{get;set;}

    public Coil Coil{get;set;}

}

​

public class Coil

{

    public int CoilId{get;set;}

    public Material Material{get;set;}

    public double CoilLength{get;set;}

    public string BatchId{get;set;} = "";

}

​

public class Material

{

    public List<int> MaterialIds{get;set;} = new List<int>();

    public double Width{get;set;}

    public double Thickness{get;set;}

}