using AutoMapper;
using System;
using System.Collections.Generic;

namespace TestAutoMapperInheritanceMapping
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Mapper.Initialize(cfg =>
            {
                cfg.CreateMap(typeof(IEnumerable<>), typeof(CollectionDto<>))
                    .ForMember("Records", opt => opt.MapFrom(src => src));
                cfg.CreateMap<SomeObject, SomeObjectDto>();
            });

            var list = new List<SomeObject>
            {
                new SomeObject { Property1 = 1, Property2 = 2 },
                new SomeObject { Property1 = 3, Property2 = 4 },
            };

            var result = Mapper.Map<SomeObjectCollectionDto>(list);

            foreach (var x in result.Records)
            {
                Console.WriteLine(x);
            }

            Console.ReadKey();
        }
    }

    public class CollectionDto<T>
        where T : class
    {
        public int Count => Records.Count;
        public ICollection<T> Records { get; set; }
    }

    // Some custom attributes here that only apply to
    // SomeObjectDto things.
    public class SomeObjectCollectionDto : CollectionDto<SomeObjectDto>
    { }

    public class SomeObject
    {
        public int Property1 { get; set; }
        public int Property2 { get; set; }
    }
    public class SomeObjectDto
    {
        public int Property1 { get; set; }
        public int Property2 { get; set; }

        public override string ToString()
        {
            return $"Property1: {Property1} | Property2: {Property2}";
        }
    }
}