A custom Newtonsoft JSON JsonConverter for writing a class instance as a dictionary (JSON object)

ItemsConverter.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;

namespace Foobar
{
    public class ItemsConverter : JsonConverter
    {
        private void WriteJson(JsonWriter writer, Items items, JsonSerializer serializer)
        {
            var asDictionarySortedByName =
                new SortedDictionary<string, string>(items.ToDictionary(v => v.Name, v => v.Value));
            serializer.Serialize(writer, asDictionarySortedByName);
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value is Items items)
            {
                WriteJson(writer, items, serializer);
            }
            else
            {
                serializer.Serialize(writer, value);
            }
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
            JsonSerializer serializer)
        {
            throw new NotImplementedException();
        }

        public override bool CanRead => false;
        public override bool CanWrite => true;

        public override bool CanConvert(Type objectType)
        {
            return typeof(Items).IsAssignableFrom(objectType);
        }
    }
    
    public class Items : IEnumerable<Item> {
        public IEnumerator<Item> GetEnumerator()
        {
            throw new NotImplementedException();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }

    public class Item
    {
        public string Name;
        public string Value;    
    }
}