c# - 如何在这种情况下使用 c# AutoMapper 映射对象

Question

这是我要映射的源对象

 public class Post
{ 
    public string PostId { get; set; }
    public string PostTitle { get; set; } 
    public virtual List<Comment> Comments { get; set; }
}

这个目标对象我想将源映射到

 public class PostResponse
{
    public int PostId { get; set; } 
    public string PostTitle { get; set; } 
    public  IEnumerable<CommentObj> Comments { get; set; }
} 

这是控制器抛出错误 AutoMapper.AutoMapperMappingException：错误映射类型。

    [HttpGet(ApiRoutes.Posts.GetAll)]
    public async Task<IActionResult> GetAll()
    { 
            var posts = await _postServices.GetPostsAsync();
            return Ok(_mapper.Map<List<PostResponse>>(posts)); 
    }

这是服务

    public async Task<List<Post>> GetPostsAsync()
    { 
            var queryable = _dataContext.Posts.AsQueryable();
            var psts = await queryable.Include(x => x.Comments).ToListAsync();
            return psts; 
    }

这是映射配置文件

    public DomainResponseProfile()
    {

        CreateMap<Post, PostResponse>().
        ForMember(dest => dest.Comments, opt => opt.MapFrom(src => src.Comments.Select(x => new CommentResponse
        { PostId = x.PostId, DateCommented = x.DateCommented })));
    }

这是域注释对象

public class Comment
{ 
    public int CommentId { get; set; }
    public int PostId { get; set; }  
}

这是响应评论对象

 public class CommentResponse
{
    public int CommentId { get; set; } 
    public List<CommentObj> Comments { get; set; }
}

标签： c#.net-coreentity-framework-coreautomapper

Answer 1

我才发现我做错了什么。

 wrong  

CreateMap<Post, PostResponse>().
    ForMember(dest => dest.Comments, opt => opt.MapFrom(src => src.Comments.Select(x => new CommentResponse
    { PostId = x.PostId, DateCommented = x.DateCommented })));

正确的

   CreateMap<Post, PostResponse>().
        ForMember(dest => dest.Comments, opt => opt.MapFrom(src => 
  src.Comments));