列表与LT;＆GT;不包含getAwaiter的定义

Question

我正在我的asp.net webapi项目中实现automapper。我还在业务层中实现了异步任务。我基本上想要返回MoviesDto对象而不是Movie实体，但是获取错误列表不包含getAwaiter的定义。错误在行

return await _mapper.Map<List<MoviesDto>>(movies);

不确定问题是什么。这是我的代码

MoviesDto

public class MoviesDto : BaseDto
    {
        public int MovieID { get; set; }
        public string Title { get; set; }
        public int? ReleaseYear { get; set; }
        public string Plot { get; set; }
        public int? MovieLength { get; set; }
    }

业务访问层

public class MovieBusiness: IMovieBusiness
    {
        IMovieService _movieService;
        IMapper _mapper;

        public MovieBusiness(IMovieService movieService, IMapper mapper)
        {
            _movieService = movieService;
            _mapper = mapper;
        }

        public async Task<IEnumerable<MoviesDto>> GetAllMovies()
        {

            var movies = _movieService.GetMovies();
            return await _mapper.Map<List<MoviesDto>>(movies);
        }

    }   

Answer 1

方法_mapper.Map()不是异步的，因此您不必await。

只需使用return _mapper.Map<List<MoviesDto>>(movies);

即可