在 .net 核心 NLayer 架构中处理请求时发生未处理的异常

Posted 2023-02-19

【中文标题】在 .net 核心 NLayer 架构中处理请求时发生未处理的异常

【英文标题】：An unhandled exception occurred while processing the request in .net core NLayer architecture

【发布时间】：2021-01-21 19:08:40

【问题描述】：

我正在尝试使用 NLayer 架构和通用存储库在 .net 核心中开发一个 api。

当我尝试获取数据时，我看到了一个错误。

我的错误 处理请求时发生未处理的异常。 InvalidOperationException：尝试激活“Fenerbahce.API.Controllers.PlayerController”时无法解析“Fenerbahce.Business.Abstract.IPlayerManager”类型的服务。

IPlayerManger：

public interface IPlayerManager

        Task<IEnumerable<Player>> GetAllPlayers();
        Task<Player> GetPlayerById(int id);
        Task<Player> CreatePlayer(Player player);
        Task UpdatePlayer(Player playerToBeUpdated,Player player);
        Task DeletePlayer(Player player);

播放器管理器

私有只读 IUnitOfWork _unitOfWork;

public PlayerManager(IUnitOfWork unitOfWork)

    this._unitOfWork = unitOfWork;

public async Task<Player> CreatePlayer(Player player)

    await _unitOfWork.Players.AddAsync(player);
    await _unitOfWork.CommitAsync();
    return player;


public async Task DeletePlayer(Player player)

    _unitOfWork.Players.Remove(player);
    await _unitOfWork.CommitAsync();


public async Task<IEnumerable<Player>> GetAllPlayers()

    return await _unitOfWork.Players.GetAllAsync();


public async Task<Player> GetPlayerById(int id)

    return await _unitOfWork.Players.GetByIdAsync(id);


public async Task UpdatePlayer(Player playerToBeUpdated, Player player)

    
    playerToBeUpdated.updatedAt = DateTime.Now;

    await _unitOfWork.CommitAsync();

IUnitOfWork

  public interface IUnitOfWork : IDisposable
    
        IBranchDal Branchs  get; 
        ICoachDal Coachs  get; 
        IPlayerDal Players get;
        ITeamDal Teams get;
        Task<int> CommitAsync();
    

EfUnitOfWork.cs

public class EfUnitOfWork : IUnitOfWork

    private readonly FBDbContext _context;
    private EfBranchDal _branchDal;
    private EfCoachDal _coachDal;
    private EfPlayerDal _playerDal;
    private EfTeamDal _teamDal;
   

    public EfUnitOfWork(FBDbContext context)
    
        this._context = context;
    

    public IBranchDal Branchs => _branchDal = _branchDal ?? new EfBranchDal(_context);

    public ICoachDal Coachs => _coachDal = _coachDal ?? new EfCoachDal(_context);

    public IPlayerDal Players => _playerDal = _playerDal ?? new EfPlayerDal(_context);

    public ITeamDal Teams => _teamDal = _teamDal ?? new EfTeamDal(_context);

    public async Task<int> CommitAsync()
    
        return await _context.SaveChangesAsync();
    

     public void Dispose()
    
        _context.Dispose();
    

PlayerController.cs

  public class PlayerController:ControllerBase
    

        private readonly IPlayerManager _playerManager;
        private readonly IMapper _mapper; 
    
        public PlayerController(IPlayerManager playerManager, IMapper mapper)
        
            this._playerManager = playerManager;
            this._mapper = mapper;
       
        

        [HttpGet] 
        public async Task<ActionResult<IEnumerable<PlayerDTO>>> ListAllPlayers()
        
            var players = await _playerManager.GetAllPlayers();

            var playerResources = _mapper.Map<IEnumerable<Player>,
            IEnumerable<PlayerDTO>>(players);
            return Ok(playerResources);

        
    

感谢您的帮助。

【问题讨论】：

它准确地告诉你出了什么问题Unable to resolve service for type 'Fenerbahce.Business.Abstract.IPlayerManager' while attempting to activate 'Fenerbahce.API.Controllers.PlayerController - 你需要一个类型来实现注册到你的依赖注入框架的接口。

【参考方案1】：

显然，依赖注入容器丢失了。您可以为此使用 unity/ninject/autofac，您可以从 google 学习如何使用。

还有，HER ZAMAN HER YERDE..

【讨论】：

是的，我在服务中添加了瞬态并且这个工作..正如你所说的 bütün bu alemde en büyüksün fenerbahçe..