using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace  System.Text.Json.Serialization
{
    public class JsonStringConverter : JsonConverter<string>
    {
        public override string Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.Null)
            {
                return null;
            }

            if (reader.TokenType == JsonTokenType.String)
            {
                return reader.GetString();
            }
            return null;
        }

        public override void Write(Utf8JsonWriter writer, string value, JsonSerializerOptions options)
        {
            if (value == null)
            {
                writer.WriteNullValue();
            }
            else
            {
                writer.WriteStringValue(value);
            }
        }

    }
}