在Blazor WebAssembly应用程序中，当页面刷新时，不会自动调用GetAuthenticationStateAsync()方法。因此，需要手动调用此方法来更新身份验证状态。

以下是实现此解决方案的代码示例：

1.在你的页面中添加以下代码：

@inject AuthenticationStateProvider AuthenticationStateProvider

@code{
   protected override async Task OnInitializedAsync()
   {
      var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
      NotifyAuthenticationStateChanged(authState);
   }
}

2.更新Blazor WebAssembly项目中的Program.cs文件，如下所示：

using System.Threading.Tasks;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using BlazorApp1.Services;

namespace BlazorApp1
{
  public class Program
  {
    public static async Task Main(string[] args)
    {
      var builder = WebAssemblyHostBuilder.CreateDefault(args);
      builder.RootComponents.Add("app");

      builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

      builder.Services.AddOptions();
      builder.Services.AddAuthorizationCore();

      builder.Services.AddScoped();
      builder.Services.AddScoped();
      builder.Services.AddScoped();

      await builder.Build().RunAsync();
    }
  }
}

3.在上述代码示例中，使用自定义身份验证状态提供程序替换了默认的ProvideAuthenticationState()方法。下面是CustomAuthenticationStateProvider.cs类的代码：

using System.Security.Claims;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components.Authorization;

namespace BlazorApp1.Services

{
  public class CustomAuthenticationStateProvider : AuthenticationStateProvider
  {
    public override async Task GetAuthenticationStateAsync()
    {
      // 从服务器获取身份验证令牌

      return new AuthenticationState(new ClaimsPrincipal(new ClaimsIdentity()));
    }
  }
}

4.最后，在你的Blazor组件中添加授权属性，如下所示：

@page "/dashboard"
@