public void ConfigureServices(IServiceCollection services)

        {

            // 添加身份验证服务

            services.AddAuthorizationCore();

            services.AddScoped<AuthenticationStateProvider, ServerAuthenticationStateProvider>();

        }

using BlazorDemo.Shared;

using Microsoft.AspNetCore.Components;

using Microsoft.AspNetCore.Components.Authorization;

using System.Net.Http;

using System.Security.Claims;

using System.Threading.Tasks;

namespace BlazorDemo.Client

{

    public class SelfAuthenticationStateProvider : AuthenticationStateProvider

    {

        private readonly HttpClient _httpClient;

        public SelfAuthenticationStateProvider(HttpClient httpClient)

        {

            _httpClient = httpClient;

        }

        public override async Task<AuthenticationState> GetAuthenticationStateAsync()

        {

            var userInfo = await _httpClient.GetJsonAsync<UserInfo>("user");

            var identity = userInfo.IsAuthenticated

                ? new ClaimsIdentity(new[] { new Claim(ClaimTypes.Name, userInfo.Name) }, "selfauth")

                : new ClaimsIdentity();

            return new AuthenticationState(new ClaimsPrincipal(identity));

        }

    }

}