CSVHelper无法将空浮点值转换为字符串

public class EmptyFloatToStringConverter : CsvHelper.TypeConversion.ITypeConverter
{
    public object ConvertFromString(string text, CsvHelper.IReaderRow row, CsvHelper.Configuration.MemberMapData memberMapData)
    {
        if (string.IsNullOrEmpty(text))
        {
            return string.Empty;
        }
        else
        {
            return text;
        }
    }

    public string ConvertToString(object value, CsvHelper.IWriterRow row, CsvHelper.Configuration.MemberMapData memberMapData)
    {
        return value.ToString();
    }
}

using (var reader = new StreamReader("path/to/csv/file.csv"))
using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
{
    csv.Configuration.RegisterClassMap<YourClassMap>(); // 注册自定义转换器
    var records = csv.GetRecords<YourClass>().ToList();
}

using (var writer = new StreamWriter("path/to/csv/file.csv"))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
    csv.Configuration.RegisterClassMap<YourClassMap>(); // 注册自定义转换器
    csv.WriteRecords(records);
}