Asp.core 2获得了对用户的声明

Question

我可能会在asp.core1中使用DI获得声明，如下所示

public class UserService : IUserService
{
    private IHttpContextAccessor _httpContext;

    public UserService(IHttpContextAccessor httpContext)
    {           
        _httpContext = httpContext;
    }
}

对于In asp.core 2，_httpContext.User.Identity.IsAuthenticated的值为false，并且不包含声明。

我的startup.cs看起来像这样：

public void ConfigureServices(IServiceCollection services)
{
    // ...

    services.AddAuthentication(o =>
    {
        o.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
        o.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    })
        .AddJwtBearer(options =>
        {
            options.RequireHttpsMetadata = false;
            options.SaveToken = true;
            options.TokenValidationParameters = new TokenValidationParameters
            {
                // ...
            };
        });

    services.AddCors();
    services.AddMvc();

    services.AddTransient<IUserService, UserService>();
    services.AddTransient<IHttpContextAccessor, HttpContextAccessor();
}