The TypeConverter class is under namespace CsvHelper.TypeConversion The TypeConverterAttribute is under namespace CsvHelper.Configuration.Attributes public class ToIntArrayConverter : TypeConverter { public override object ConvertFromString(string text, IReaderRow row, MemberMapData memberMapData) { string[] allElements = text.Split(','); int[] elementsAsInteger = allElements.Select(s => int.Parse(s)).ToArray(); return new List<int>(elementsAsInteger); } public override string ConvertToString(object value, IWriterRow row, MemberMapData memberMapData) { return string.Join(',', ((List<int>)value).ToArray()); } } To use this converter, simply add the following TypeConverterAttribute annotations on top of your properties: To use this converter, simply add the following TypeConverterAttribute annotations on top of your properties: public class Names { [Name("name")] public string Name { get; set; } [Name("numbersA")] [TypeConverter(typeof(ToIntArrayConverter))] public List<int> NumbersA { get; set; } [Name("numbersB")] [TypeConverter(typeof(ToIntArrayConverter))] public List<int> NumbersB { get; set; } }
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