using System;

using AutoMapper;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

​

    public record SimpleRecord(string PropA, string PropB);

    public class SimpleClass

    {

        public SimpleClass(string propA, string propB, string propC)

        {

            PropA = propA;

            PropB = propB;

            PropC = propC;

        }

​

        public string PropA { get; set; }

​

        public string PropB { get; set; }

​

        public string PropC { get; set; }

    }

​

    private class MyMapper

    {

        private readonly IMapper mapper;

        public MyMapper()

        {

            var config = new MapperConfiguration(mapperConfig =>

            {

                mapperConfig.CreateMap<SimpleClass, SimpleRecord>().ConstructUsing(src => new SimpleRecord(src.PropA, "newValPropB"));

            });

            mapper = config.CreateMapper();

        }

​

        public SimpleRecord MapToRecord(SimpleClass input)

        {

            return mapper.Map<SimpleRecord>(input);

        }

    }

}