1、 record定义及使用

参考文档：.NET C# 9.0 record和with的定义及使用

2、扩展方法

参考文档：.NET(C#) 扩展方法(Extension)

实现代码如下，

public record BFrom 
{
    public Guid Id { get; init; }
    public Guid DbExtraId { get; init; }
}
public static class AutoMapperExtensions
{
    public static IMappingExpression<TSource, TDestination> MapRecordMember<TSource, TDestination, TMember>(
        this IMappingExpression<TSource, TDestination> mappingExpression,
        Expression<Func<TDestination, TMember>> destinationMember, Expression<Func<TSource, TMember>> sourceMember)
    {
        var memberInfo = ReflectionHelper.FindProperty(destinationMember);
        string memberName = memberInfo.Name;
        return mappingExpression
            .ForMember(destinationMember, opt => opt.MapFrom(sourceMember))
            .ForCtorParam(memberName, opt => opt.MapFrom(sourceMember));
    }
}

调用方法：

CreateMap<BFrom, ATo>()
    .MapRecordMember(a => a.ExtraId, src => src.DbExtraId)
    .ReverseMap();