CryptoExchange.Net/CryptoExchange.Net/Converters/SystemTextJson/LongConverter.cs

using System;
using System.Globalization;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace CryptoExchange.Net.Converters.SystemTextJson;

/// <summary>
/// Int converter
/// </summary>
public class LongConverter : JsonConverter<long?>
{
    /// <inheritdoc />
    public override long? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        if (reader.TokenType == JsonTokenType.Null)
            return null;

        if (reader.TokenType == JsonTokenType.String)
        {
            var value = reader.GetString();
            if (string.IsNullOrEmpty(value))
                return null;

            return long.Parse(value, NumberStyles.Integer, CultureInfo.InvariantCulture);
        }

        return reader.GetInt64();
    }

    /// <inheritdoc />
    public override void Write(Utf8JsonWriter writer, long? value, JsonSerializerOptions options)
    {
        if (value == null)
            writer.WriteNullValue();
        else
            writer.WriteNumberValue(value.Value);
    }
}