using System;

using System.IO;

using System.Text;

using System.Globalization;

using System.Linq;

using System.Collections.Generic;

using CsvHelper;

using CsvHelper.Configuration;

using CsvHelper.TypeConversion;

public class Program

{

    public static void Main()

    {

        // CSV file contents

        var sb = new StringBuilder();

        sb.AppendLine("IsTrue,Bar");

        sb.AppendLine("iAmTrUe,Yep");

        sb.AppendLine("somethingElse,Nope");

        // Setup for deserializing

        List<Foo> foos;

        using (var stream = new MemoryStream())

        using (var reader = new StringReader(sb.ToString()))

        using (var csvReader = new CsvReader(reader, CultureInfo.InvariantCulture))

        {

            csvReader.Context.TypeConverterCache.AddConverter<bool>(new MyCustomBooleanConverter());

​

            // Deserialize

            foos = csvReader.GetRecords<Foo>().ToList();

            foreach (var foo in foos)

                Console.WriteLine("IsTrue: {0}, Bar: {1}", foo.IsTrue, foo.Bar);

        }

        // Serialize again

        StringWriter writer = new StringWriter();

        using (var csvWriter = new CsvWriter(writer, CultureInfo.InvariantCulture))

        {

            csvWriter.Context.TypeConverterCache.AddConverter<bool>(new MyCustomBooleanConverter());

            csvWriter.WriteRecords(foos);

        }

        Console.WriteLine();

        Console.WriteLine(writer.ToString());

    }

}

​

public class Foo

{

    public bool IsTrue { get; set; }

    public string Bar { get; set; }

}

​

public class MyCustomBooleanConverter : ITypeConverter

{

    public object ConvertFromString(String str, IReaderRow row, MemberMapData data)

    {

        return str == "iAmTrUe";

    }

    public string ConvertToString(Object obj, IWriterRow row, MemberMapData data)

    {

        return

            obj is bool && (bool)obj

                ? "iAmTrUe"

                : "nopeIAmFalse";

    }

}