Get User Claims (and ID) in Balzor page

Home.razor

@page "/"
@using System.Security.Claims
@inject AuthenticationStateProvider AuthenticationStateProvider
<PageTitle>Home</PageTitle>

<h1>Hello, world!</h1>

Welcome to your new app.

<h3>ClaimsPrincipal Data</h3>

<p>@_authMessage</p>

@if (_claims.Count() > 0)
{
    <table class="table">
        @foreach (var claim in _claims)
        {
            <tr>
                <td>@claim.Type</td>
                <td>@claim.Value</td>
            </tr>
        }
    </table>
}

<p>@_userId</p>

@code {
    private string _authMessage;
    private string _userId;
    private IEnumerable<Claim> _claims = Enumerable.Empty<Claim>();

    protected override async Task OnParametersSetAsync()
    {
        await GetClaimsPrincipalData();
        await base.OnParametersSetAsync();
    }

    private async Task GetClaimsPrincipalData()
    {
        var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
        var user = authState.User;

        if (user.Identity.IsAuthenticated)
        {
            _authMessage = $"{user.Identity.Name} is authenticated.";
            _claims = user.Claims;
            _userId = user.Claims.Where(e => e.Type.Contains("identity/claims/nameidentifier")).First().Value;
        }
        else
        {
            _authMessage = "The user is NOT authenticated.";
        }
    }
}