我正在尝试从我的 Web API 中的 Controller 外部的上下文中获取当前用户。我正在使用 OpenIddict 对用户进行身份验证，因此授权是通过 token 进行的。

我已在 Startup.cs 中将 HttpContextAcessor 注册为单例:

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); 

public class NotificationHub : Hub 
    { 
        private IHttpContextAccessor _contextAccessor; 
        private HttpContext _context { get { return _contextAccessor.HttpContext; } } 
 
        public NotificationHub(IHttpContextAccessor contextAccessor) 
        { 
            _contextAccessor = contextAccessor; 
        } 
 
        public async Task JoinGroup() 
        { 
            Groups.Add(Context.ConnectionId, $"notification_{_context.User.Identity.Name}"); 
        } 
 
        public void Send(JsonResult notification) 
        { 
                Clients.Client(Context.ConnectionId).sendNotification(notification); 
        } 
    } 

请您参考如下方法:

在我使用 .Net Core 2.0 的情况下，我需要在 Controller 外部获取用户 ID，在应用程序服务中，我执行了以下操作:

在 启动.cs 我在 下添加了这一行配置服务

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); 

public class UserResolverService 
{ 
    private readonly IHttpContextAccessor _httpContext; 
    private readonly UserManager<ApplicationUser> _userManager; 
 
    public UserResolverService(IHttpContextAccessor httpContext, UserManager<ApplicationUser> userManager) 
    { 
        _httpContext = httpContext; 
        _userManager = userManager; 
    } 
 
    public string GetUserId() 
    { 
        var userId = _userManager.GetUserId(_httpContext.HttpContext.User); 
        return userId; 
    } 
} 

public class MyApplicationService 
{ 
    private readonly ApplicationDbContext _context; 
    private readonly UserResolverService _userResolverService; 
 
    public MyApplicationService(ApplicationDbContext context, UserResolverService userResolverService) 
    { 
        _context = context; 
        _userResolverService = userResolverService; 
    } 
 
    public async Task Create(MyModel entity) 
    { 
        entity.CreatorUserId = _userResolverService.GetUserId(); 
        _context.MyModel.Add(entity); 
        await _context.SaveChangesAsync(); 
    } 
} 

public class UserResolverService 
{ 
    private readonly IHttpContextAccessor _httpContext; 
 
    public UserResolverService(IHttpContextAccessor httpContext) 
    { 
        _httpContext = httpContext; 
    } 
    public string GetUserId() 
    { 
        var user = _httpContext?.HttpContext?.User as ClaimsPrincipal; 
        var userId = user.Claims.ElementAt(0).Value; 
        return userId; 
    } 
}