注入IHttpContextAccessor的HttpContext为null

Question

我有一个授权处理程序，我正在注入一个自定义personService。我通过默认DI连接了处理程序和personService。人员服务IhttpContextAccessor在我的应用程序的其他地方工作正常，但是当从授权处理程序调用它时，httpcontext始终为null。

以下是AuthHandler：

     public class NoChildrenRequirement : AuthorizationHandler<NoChildrenRequirement>, IAuthorizationRequirement
{
    private readonly IPersonService _personService;

    public NoChildrenRequirement(IPersonService personService)
    {
        _personService = personService;
    }

    protected override void Handle(AuthorizationContext context, NoChildrenRequirement requirement)
    {
        var user = context.User;
        var identity = user.Identity;
        var isAuthenticated = identity.IsAuthenticated;

        var currentPerson = _personService.CurrentPerson();

        if (isAuthenticated && currentPerson != null && !currentPerson.IsAChild)
        {
            context.Succeed(requirement);
            return;
        }
        context.Fail();
    }
}

这是我在启动时连接的地方：

     services.AddTransient<NoChildrenRequirement>();
        services.Configure<AuthorizationOptions>(options =>
        {
            options.AddPolicy("NoChildren", policy => policy.Requirements.Add(
                services.BuildServiceProvider().GetRequiredService<NoChildrenRequirement>()));
        });

这是人事服务的开始：

     public class PersonService : IPersonService
{
    private readonly IPersonRepository _repository;
    private readonly IMemoryCache _memoryCache;
    private readonly IConfigService _configService;
    private readonly IHttpContextAccessor _context;
    private readonly IResourceService _resourceService;
    private readonly string _cacheKey = "Person_";

    public PersonService(IPersonRepository repository, IMemoryCache memoryCache, 
        IConfigService configService, IHttpContextAccessor context, 
        IResourceService resourceService)
    {
        _repository = repository;
        _memoryCache = memoryCache;
        _configService = configService;
        _context = context;
        _resourceService = resourceService;
    }

这是我在启动时连接个人服务的地方：

    services.AddTransient<IPersonService, PersonService>();

如果我访问：IHttpContextAccessor _context;当我从authhandler调用personservice时，所有其他依赖关系正确连接，甚至具体的HttpContextAccessor值不为null，但HttpContextAccessor中的HttpContext为null。有任何想法吗？