c# - .Net Core - 将 API 中间件中的依赖项 IUserInfo 注入(inject)到存储库层

Question

假设我有以下结构化项目层，如 Repository -> Service -> API 从下到上，代码示例:

存储库:

public interface IUserInfo
{
    int UID{ get; set; }
}
public class UserInfo : IUserInfo
{
    public int UID { get; set; }
}
public class ProductionRepository : Repository, IProductionRepository {
    public ProductionRepository(IUserInfo userInfo, StoreDbContext dbContext) : base(userInfo, dbContext)
    {}
    //...
}

服务:

public class ProductionService : Service, IProductionService {
        public ProductionService(IUserInfo userInfo, StoreDbContext dbContext)
            : base(userInfo, dbContext)
        {
        }
//...
}
public abstract class Service {        
    protected IProductionRepository m_productionRepository;
    public Service(IUserInfo userInfo, StoreDbContext dbContext)
    {
        UserInfo = userInfo;
        DbContext = dbContext;
    }
    protected IProductionRepository ProductionRepository
            => m_productionRepository ?? (m_productionRepository = new ProductionRepository(UserInfo, DbContext));
}

API:

  public class ProductionController : Controller {
        private readonly IUserInfo userInfo;
        protected IProductionService ProductionBusinessObject;
        public ProductionController(IUserInfo _userInfo, IProductionService productionBusinessObject)
        {
            userInfo = _userInfo;
            ProductionBusinessObject = productionBusinessObject;
        }
  }

现在，在我的 Startup.cs 中，我使用带有“OnTokenValidated”事件的 JWT token 从 token 中获取 UserInfo 信息:

services.AddAuthentication(options =>
{
     options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(options =>
{
     options.Events = new JwtBearerEvents
     {
         #region Jwt After Validation Authenticated
         OnTokenValidated = async context =>
         {
              #region Get user's immutable object id from claims that came from ClaimsPrincipal
              var userID = context.Principal.Claims.Where(c => c.Type == ClaimTypes.NameIdentifier)
              services.Configure<UserInfo>(options =>
              {
                    options.UID = userID;
              });
              #endregion
          },
          #endregion
       }
};

我正在使用 services.Configure 并尝试将 UID 分配给 IUserInfo 对象，但是当我在我的 Controller 中进行调试时，IUserInfo 总是代表一个空对象，就像在构造函数或 api 中一样方法。我知道我可能滥用了 .Net 核心中的依赖注入(inject)，所以请随时指导我将 IUserInfo 注入(inject)我的 Controller --> Service --> Repository 的正确方法，所以都可以获得真实的UserInfo信息!

Answer 1

您可以通过在 Startup 中将其注册为服务来注入(inject) IUserInfo。

services.AddScoped<IUserInfo>(provider =>
{
    var context = provider.GetService<IHttpContextAccessor>();

    return new UserInfo
    {
        UID = context.HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier)
    };
});