Proper way to do per user state management in Blazor with Identity

    internal sealed class AccountDataState
    {
        public string? Username { get; private set; }
        private readonly IHttpContextAccessor _httpContextAccessor;
        private readonly UserManager<ApplicationUser> _userManager;
        private readonly IdentityUserAccessor _userAccessor;

        public AccountDataState(IHttpContextAccessor httpContextAccessor, UserManager<ApplicationUser> userManager, IdentityUserAccessor userAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
            _userManager = userManager;
            _userAccessor = userAccessor;
        }

        public event Action OnChange;
        public async Task InitializeAsync()
        {
            var user = await _userAccessor.GetRequiredUserAsync(_httpContextAccessor.HttpContext);
            Username = await _userManager.GetUserNameAsync(user);
            NotifyStateChanged();
        }
        private void NotifyStateChanged() => OnChange?.Invoke();
    }

    protected override async void OnInitialized()
    {
        State.OnChange += StateHasChanged;
        await State.InitializeAsync();
    }

<h1>@username</h1>
@code{
    protected override async Task OnInitializedAsync()
    {
        username = State.Username;
    }