我有以下模型:
public class Device
{
public string DeviceId { get; set; }
public string DeviceName { get; set; }
private ICollection<TagDevice> _tagDevices;
public virtual ICollection<TagDevice> TagDevices { get => _tagDevices ?? (_tagDevices = new List<TagDevice>()); protected set => _tagDevices = value; }
}
public class Tag : BaseEntity
{
public string Name { get; set; }
private ICollection<TagDevice> _tagDevices;
public virtual ICollection<TagDevice> TagDevices { get => _tagDevices ?? (_tagDevices = new List<TagDevice>()); protected set => _tagDevices = value; }
}
public class TagDevice
{
public int TagId { get; set; }
public string DeviceId { get; set; }
public virtual Tag Tag { get; set; }
public virtual Device Device { get; set; }
}
我有DTO课程:
public class TagDisplayDto
{
public int Id { get; set; }
public string Name { get; set; }
public DateTime CreatedAt { get; set; }
public DateTime? UpdatedAt { get; set; }
public int TimesUsed { get; set; }
public int CarrierId { get; set; }
}
public class DeviceDisplayDto
{
public string DeviceId { get; set; }
public string DeviceName { get; set; }
public List<TagDisplayDto> Tags { get; set; }
}
现在,我想为DeviceDisplayDto创建映射并填充标签:
CreateMap<Device, DeviceDisplayDto>()
.ForMember(d => d.Tags, opt => opt.MapFrom(s => s.TagDevices...))
;
TagDevices
是集合,而不是标记类型,集合的每个元素都具有标记类型的属性。如何创建?
您可以在Select()
个集合上使用TagDevice
将其转换为TagDisplayDto
个列表:
CreateMap<Device, DeviceDisplayDto>()
.ForMember(deviceDisplayDto => deviceDisplayDto.Tags, options =>
options.MapFrom(device => device.TagDevices.Select(tagDevice => new TagDisplayDto
{
CarrierId = 123, // TODO
CreatedAt = DateTime.UtcNow, // TODO
Id = tagDevice.TagId,
Name = tagDevice.Tag.Name,
TimesUsed = 0, // TODO
UpdatedAt = DateTime.UtcNow, // TODO
}).ToList()));
我将某些属性标记为TODO,因为我不知道您使用的是整个模型,还是缺少某些属性。您需要自行填写。至少该代码应该使您入门。