ProjectToFlattening.cs

ProjectToFlattening.cs

static void Main(string[] args)
{
    Mapper.Initialize(cfg =>
    {
		cfg.AddProfile<MyMapperProfile>();
    });
	Mapper.AssertConfigurationIsValid();
	new[]{new OrderDTO{ customer = new customer {  ID = 1, name = "john" }}}.AsQueryable().ProjectTo<Order>().Dump();
}
public class Order
{
        public int ID { get; set; }

        public int customer_id { get; set; }
        public string customer_name { get; set; }
}
public class OrderDTO
{
        public int ID { get; set; }

        public customer customer { get; set; }
}
public class customer
{
        public int ID { get; set; }

        public string name { get; set; }
}
public class MyMapperProfile : Profile
{
         public MyMapperProfile()
        {
            this.SourceMemberNamingConvention = new LowerUnderscoreNamingConvention();
            this.DestinationMemberNamingConvention = new LowerUnderscoreNamingConvention();

             CreateMap<OrderDTO, Order>()
                        .ForMember(m => m.ID, src => src.Ignore())
                        .ReverseMap();
        }
}