marechai/Marechai/Areas/Identity/Pages/Account/Manage/PersonalData.cshtml.cs

using System.Threading.Tasks;
using Marechai.Database.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;

namespace Marechai.Areas.Identity.Pages.Account.Manage
{
    public class PersonalDataModel : PageModel
    {
        readonly ILogger<PersonalDataModel>   _logger;
        readonly UserManager<ApplicationUser> _userManager;

        public PersonalDataModel(UserManager<ApplicationUser> userManager, ILogger<PersonalDataModel> logger)
        {
            _userManager = userManager;
            _logger      = logger;
        }

        public async Task<IActionResult> OnGet()
        {
            ApplicationUser user = await _userManager.GetUserAsync(User);

            if(user == null)
            {
                return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
            }

            return Page();
        }
    }
}