using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

public class Category {

    [JsonProperty(PropertyName = "id")]

    public int Id { get; set; }

    [JsonProperty(PropertyName = "name")]

    public string Name { get; set; }

    [JsonProperty(PropertyName = "categoryListRecursive")]

    public List<Category>? SubCategories { get; set; } = null;

    public static List<Category>? FromJArray(JArray jArray) {

        List<Category>? categories = null;

        foreach(JObject category in jArray) {

            if(category != null && category.TryGetValue("id", out JToken id) && category.TryGetValue("name", out JToken name) && category.TryGetValue("categoryListRecursive", out JToken subCategories)) {

                Category nextCategory = new() {

                    Id = id.ToObject<int>(),

                    Name = name.ToObject<string>(),

                };

                if(subCategories is JArray subCategoryList)

                    nextCategory.SubCategories = (subCategoryList.Count > 0) ? FromJArray(subCategoryList) : new List<Category>() {};

                if(categories == null)

                    categories = new List<Category>() {} ;

                categories.Add(nextCategory);

            }

        }

        return categories;      

    }

    public override string ToString() {     

        return JsonConvert.SerializeObject(this, Formatting.Indented);      

    }

}

​

​

public class Program {

    public static void Main() {

        string json = @"[{""id"":2,""name"":""Men"",""categoryListRecursive"":[{""id"":5,""name"":""Pants"",""categoryListRecursive"":null},{""id"":6,""name"":""Shirts"",""categoryListRecursive"":null}]},{""id"":3,""name"":""Women"",""categoryListRecursive"":[{""id"":7,""name"":""Pants"",""categoryListRecursive"":null},{""id"":8,""name"":""Shirts"",""categoryListRecursive"":null}]},{""id"":4,""name"":""Accessories"",""categoryListRecursive"":[]}]";

        var categories = Category.FromJArray(JArray.Parse(json)) ?? new();

        foreach(var category in categories)

            Console.WriteLine("{0}\n--------------------------\n", category);

    }

}