AutoMapper 8.0.0:如果属性有默认值，如何忽略映射？

using AutoMapper;

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<SourceClass, DestinationClass>()
            .ForMember(dest => dest.PropertyToIgnore, opt => opt.MapFrom(src => src.PropertyWithDefaultValue));
    }
}

using AutoMapper;

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // 注册映射配置类
        services.AddAutoMapper(typeof(MappingProfile));
    }
}

using AutoMapper;

public class MyClass
{
    private readonly IMapper _mapper;

    public MyClass(IMapper mapper)
    {
        _mapper = mapper;
    }

    public void MapObjects()
    {
        var source = new SourceClass
        {
            PropertyWithDefaultValue = "Default value"
        };

        var destination = _mapper.Map<DestinationClass>(source);
    }
}