nukeitter/Pages/Profile.razor

@page "/profile"
@using System.Security.Claims
@inject NavigationManager _navigationManager

<PageTitle>Twit Nuke</PageTitle>

<div
    class="container mx-auto flex flex-col md:flex-row items-center my-12 md:my-24">
    <h1>This is your profile</h1>
    <div>@claim</div>
</div>

@code {

    [CascadingParameter]
    public Task<AuthenticationState> authenticationState { get; set; }

    public Claim claim;

    protected override async Task OnInitializedAsync() {
        var authState = await authenticationState;
        var user = authState.User;

        if (user.Identity.IsAuthenticated) {
            claim = user.FindFirst(c => c.Type == ClaimTypes.NameIdentifier);
        }
        else {
            _navigationManager.NavigateTo("/");
        }
    }
}