c# – AutoMapper – 将目标字符串设置为null实际上使其成为string.Empty

Mapper.CreateMap<ObjectA, ObjectB>()
    .ForMember(dest => dest.SomeStringProperty, opt => opt.MapFrom(src => null))

SomeStringProperty现在是空字符串不为null(正如我所料)

这是一个错误吗？我如何让它实际上为null？

我看到opt.Ignore()会使它为null但我实际上想要像下面那样做一个条件null,上面简化的bug(？)阻止了这个

Mapper.CreateMap<ObjectA, ObjectB>()
    .ForMember(dest => dest.SomeStringProperty, opt => opt.MapFrom(src => src.SomeOtherProp != null ? src.SomeOtherProp.Prop1 : null))

当我配置我的映射..

Mapper.Initialize(x =>
{
    x.AddProfile<UIProfile>();
    x.AddProfile<InfrastructureProfile>();
    x.AllowNullDestinationValues = true; // does exactly what it says (false by default)
});