Why is this working in Automapper 11.0.1 but not in 12.0.1

[mpodonyi]

I am having the following code compiled in .Net 6.
It works ("All good") in Automapper 11.0.1 but not ("Oh No") in 12.0.1.
In 12.0.1 it comes back with missing "_LineItems" mapping

using AutoMapper;

public interface IOrder
{
    string OrderNumber { get; set; }
    IList<ILineItem> LineItems { get; set; }
}

public interface ILineItem
{
    string OrderItemNumber { get; set; }
}

public class Order 
{
    public string OrderNumber { get; set; } = null!;
    internal List<OrderItem> _LineItems { get; init; } = new();
}

public class OrderItem
{
    public string OrderItemNumber { get; set; } = null!;
}

public class OrderProfile : Profile
{
    public OrderProfile()
    {
        ShouldMapProperty = p => p.GetMethod != null && (p.GetMethod.IsPublic || p.GetMethod.IsAssembly);
        
        CreateMap<IOrder, Order>(MemberList.Destination);
        CreateMap<ILineItem, OrderItem>(MemberList.Destination);
           
    }
}

internal class Program
{
    public static void Main(string[] args)
    {
        try
        {
            var autoMapperConfiguration = new MapperConfiguration(cfg =>
            {
                cfg.AddProfile<OrderProfile>();
            });

            autoMapperConfiguration.AssertConfigurationIsValid();
            Console.WriteLine("All Good");
        }
        catch (Exception e)
        {
            Console.WriteLine("Oh No");
        }
    }
}

[lbargaoanu]

You're welcome to investigate that. My guess is because of the naming conventions.
I think the new behaviour makes perfect sense. The old behaviour is just an accident.

[mpodonyi]

So I try to find the code in Automapper where the Underscore in the Destination file is automagically removed.
Are there any well known prefixes which were removed except of "Get" in the old version?

[lbargaoanu]

No prefixes were removed. If you want a prefix other than Get, you need to add it in your config.

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