.net 如何在AutoMapper中添加自定义方法到项目中

我正在使用.NET Core7和AutoMapper 12，并try 创建从实体框架查询到DTO列表的映射.

var configuration = new MapperConfiguration(cfg =>
{
    cfg.CreateProjection<MachineSchedule, MachineScheduleDataDto>()
        .ForMember(m => m.ShiftsDto, opts => opts.MapFrom(m => AddShiftCondition(m.Shifts, shiftType.Value))) // HERE
        .ForMember(m => m.ScheduledStopsDto, opts => opts.MapFrom(m => m.ScheduledStops))
        .ForMember(m => m.MachineOperationsDto, opts => opts.MapFrom(m => m.MachineOperations));

    cfg.CreateProjection<MachineOperation, MachineOperationDto>()
        .ForMember(m => m.EggQuantitiesDto, opts => opts.MapFrom(m => m.EggQuantities));

    cfg.CreateProjection<EggQuantity, EggQuantityDto>();

    cfg.CreateProjection<Shift, ShiftDto>();

    cfg.CreateProjection<ScheduledStop, ScheduledStopDto>();
});

var queryMapper = configuration.CreateMapper();

var diffDays = GetWeekdaysBetweenDates(startDate, endDate);

var test = queryMapper.ProjectTo<MachineScheduleDataDto>(_typedContext?
        .AsNoTracking()
        .Include(m => m.Shifts)
        .Include(m => m.ScheduledStops)
        .Include(m => m.MachineOperations)!
        .ThenInclude(m => m.EggQuantities)
    .OrderBy(m => m.MachineScheduleId));

正如你所看到的，我有方法AddShiftCondition:

private static IEnumerable<Shift>? AddShiftCondition(ICollection<Shift>? shifts, EShiftType? shiftType)
{
    if (shifts != null && !shifts.Any())
        return null;

    if (shiftType.HasValue)
        return shifts!.Where(s => s.Type == shiftType.Value);

    return shifts;
}

我不知道为什么，但如果我使用.ProjectTo(),AddShiftCondition就不会被调用，但如果我使用.Map()，一切都很好:

var configuration = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<MachineSchedule, MachineScheduleDataDto>()
        .ForMember(m => m.ShiftsDto, opts => opts.MapFrom(m => AddShiftCondition(m.Shifts, shiftType.Value)))
        .ForMember(m => m.ScheduledStopsDto, opts => opts.MapFrom(m => m.ScheduledStops))
        .ForMember(m => m.MachineOperationsDto, opts => opts.MapFrom(m => m.MachineOperations));

    cfg.CreateMap<MachineOperation, MachineOperationDto>()
        .ForMember(m => m.EggQuantitiesDto, opts => opts.MapFrom(m => m.EggQuantities));

    cfg.CreateMap<EggQuantity, EggQuantityDto>();

    cfg.CreateMap<Shift, ShiftDto>();

    cfg.CreateMap<ScheduledStop, ScheduledStopDto>();
});

var queryMapper = configuration.CreateMapper();

var diffDays = GetWeekdaysBetweenDates(startDate, endDate);

var test = queryMapper.Map<MachineScheduleDataDto>(_typedContext?
        .AsNoTracking()
        .Include(m => m.Shifts)
        .Include(m => m.ScheduledStops)
        .Include(m => m.MachineOperations)!
        .ThenInclude(m => m.EggQuantities)
    .FirstOrDefault());

为什么会发生这种事呢？