Как получить данные авторизованного пользователя.

// Stores UserManager

private readonly UserManager<ApplicationUser> _manager; 

// Inject UserManager using dependency injection.

// Works only if you choose "Individual user accounts" during project creation.

public DemoController(UserManager<ApplicationUser> manager)  

{  

    _manager = manager;  

}

// You can also just take part after return and use it in async methods.

private async Task<ApplicationUser> GetCurrentUser()  

{  

    return await _manager.GetUserAsync(HttpContext.User);  

}  

        [HttpGet]

        [Route("/api/user/authorized")]

        public async Task<IActionResult> IsAuthorizedAsync()

        {

            var result = await _userManager.GetUserAsync(HttpContext.User);

            return Json(result);

        }