如何在CsvHelper中使用毫秒来序列化DateTime

Install-Package CsvHelper

using CsvHelper;
using CsvHelper.Configuration;
using CsvHelper.TypeConversion;

public class MillisecondDateTimeConverter : DefaultTypeConverter
{
    public override string ConvertToString(object value, IWriterRow row, MemberMapData memberMapData)
    {
        if (value is DateTime dateTime)
        {
            long milliseconds = dateTime.Ticks / TimeSpan.TicksPerMillisecond;
            return milliseconds.ToString();
        }
        return null;
    }

    public override object ConvertFromString(string text, IReaderRow row, MemberMapData memberMapData)
    {
        if (long.TryParse(text, out long milliseconds))
        {
            DateTime dateTime = new DateTime(milliseconds * TimeSpan.TicksPerMillisecond);
            return dateTime;
        }
        return null;
    }
}

public class DataModel
{
    public DateTime Timestamp { get; set; }
}

using CsvHelper.Configuration;

public sealed class DataModelMap : ClassMap<DataModel>
{
    public DataModelMap()
    {
        Map(m => m.Timestamp).Name("Timestamp").TypeConverter<MillisecondDateTimeConverter>();
    }
}

using CsvHelper;

var data = new List<DataModel>
{
    new DataModel { Timestamp = DateTime.Now }
};

var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
    HasHeaderRecord = true,
    Delimiter = ","
};

using (var writer = new StreamWriter("data.csv"))
using (var csv = new CsvWriter(writer, config))
{
    csv.Context.RegisterClassMap<DataModelMap>();
    csv.WriteRecords(data);
}

using (var reader = new StreamReader("data.csv"))
using (var csv = new CsvReader(reader, config))
{
    csv.Context.RegisterClassMap<DataModelMap>();
    var records = csv.GetRecords<DataModel>().ToList();
    foreach (var record in records)
    {
        Console.WriteLine(record.Timestamp);
    }
}