C# 自动映射两个对象，第二个对象覆盖第一个对象'；s属性

我试过这个答案：。但是，我的第二个mapping

mapper.Map（additionalUploadSongViewModel，songs）仍在用默认值覆盖其他字段，但它正确映射了
BuyLink
和
歌词

namespace App
{
    public static class AutoMapper
    {
        public static MapperConfiguration Config;

        public static void Initialize()
        {
            //Removed other mappings for verbose
            Config = new MapperConfiguration(x => {
                x.CreateMap<UploadSongViewModel, Song>()
                .IgnoreAllNonExisting()
                .ForMember(a => a.AudioName, m => m.MapFrom(s => s.SongName))
                .ForMember(a => a.AudioPath, m => m.MapFrom(s => s.SongPath));

                x.CreateMap<AdditionalUploadSongViewModel, Song>()
                .IgnoreAllNonExisting();
            });

            //No errors here
            Config.AssertConfigurationIsValid();
        }
    }
}

域模型：

public abstract class Entity
{
    public int Id { get; set; }
}

public abstract class Audio : Entity
{
    public string AudioName { get; set; }
    public string AudioPath { get; set; }
    public string CoverImagePath { get; set; }
}

public class Song : Audio
{
    //Removed some for verbose
    public string AlbumName { get; set; }
    public string ArtistName { get; set; }
    public string Lyrics { get; set; }
    public string BuyLink { get; set; }
}

视图模型：

public class UploadSongViewModel
{
    public int Id { get; set; }
    public string SongName { get; set; }
    public string ArtistName { get; set; }
    public string AlbumName { get; set; }
    public string SongPath { get; set; }
    public string CoverImagePath { get; set; }
}

public class AdditionalUploadSongViewModel
{
    public string BuyLink { get; set; }
    public string Lyrics { get; set; }
}

控制器：

[HttpPost]
public async Task<ActionResult> UploadMusic(IList<UploadSongViewModel> uploadSongsViewModel, IList<AdditionalUploadSongViewModel> additionalUploadSongViewModel)
{
     //uploadSongViewModel and additionalUploadSongViewModel has all properties filled out properly here.

     IMapper mapper = AutoMapper.Config.CreateMapper();
     List<Song> songs = mapper.Map<List<UploadSongViewModel>, List<Song> (uploadSongsViewModel.ToList());

     //songs now have proper mapped properties from uploadSongsViewModel

     mapper.Map(additionalUploadSongViewModel, songs);

     //all songs properties (songName, artistName etc) have now been overwritten by additionalUploadSongViewModel properties, instead of only BuyLink and Lyrics.
}

[HttpPost]
公共异步任务UploadMusic（IList uploadSongsViewModel，IList additionalUploadSongViewModel）
{
//uploadSongViewModel和additionalUploadSongViewModel在此处正确填写了所有属性。
IMapper mapper=AutoMapper.Config.CreateMapper（）；
List songs=mapper.Map..这是一个奇怪的想法，使用两个独立的集合..你怎么知道集合1中的项目2每次都与集合2中的项目2匹配？@JamieD77谢谢你的链接。似乎这是我的问题。我不明白你的后续问题。我只是想知道如果
上传songsviewm会发生什么odel
有10项，而
additionalUploadSongViewModel
只有9项。@JamieD77啊。它不能。它们的数量必须相同。你有没有想过把
additionalUploadSongViewModel
作为
UploadSongViewModel
的一个属性？Automapper可以处理这个问题
[HttpPost]
public async Task<ActionResult> UploadMusic(IList<UploadSongViewModel> uploadSongsViewModel, IList<AdditionalUploadSongViewModel> additionalUploadSongViewModel)
{
     //uploadSongViewModel and additionalUploadSongViewModel has all properties filled out properly here.

     IMapper mapper = AutoMapper.Config.CreateMapper();
     List<Song> songs = mapper.Map<List<UploadSongViewModel>, List<Song> (uploadSongsViewModel.ToList());

     //songs now have proper mapped properties from uploadSongsViewModel

     mapper.Map(additionalUploadSongViewModel, songs);

     //all songs properties (songName, artistName etc) have now been overwritten by additionalUploadSongViewModel properties, instead of only BuyLink and Lyrics.
}