访问Blazor服务器中的AuthenticationState以在单个位置更新组件

我是否可以在Blazor中使用某种方法来检查MainLayout.razor等位置的身份验证状态，以便在导航到组件时，如果令牌过期，我可以使状态无效？例如，如果使用OnAfterRenderAsync，则为时已晚，因为页面已呈现。我不想对每个组件重复检查。所以我想知道是否有类似于生命周期函数的东西，每次您导航到一个组件时都会调用它，我可以在其中执行类似的操作

var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();

        if (authState.User.Identity != null && authState.User.Identity.IsAuthenticated == false)
        {
            Logout();
        }
        StateHasChanged();

---

我为此使用作用域服务

在

Program.cs中

 builder.Services.AddScoped<IIdentityBroker, IdentityBroker>();

public class IdentityBroker : IIdentityBroker
{
    public IdentityBroker(AuthenticationStateProvider authenticationStateProvider)
    {
        this.authenticationStateProvider = authenticationStateProvider;
        authenticationStateProvider.AuthenticationStateChanged += AuthenticationStateProvider_AuthenticationStateChanged;
    }
    public IdentityInformation IdentityInformation => this.identityInformation;

    public event EventHandler AuthenticationStateChanged;
    private void AuthenticationStateProvider_AuthenticationStateChanged(Task<AuthenticationState> task)
    {
        var authState = task.Result;
        UpdateIdentityInfo(authState);
        AuthenticationStateChanged?.Invoke(this, new EventArgs());
    }

    public async ValueTask<IdentityInformation> GetIdentityInfoAsync()
    {
        if (identityInformation == default)
        {
            var authState = await authenticationStateProvider.GetAuthenticationStateAsync();
            UpdateIdentityInfo(authState);
        }
        return identityInformation;
    }

    private void UpdateIdentityInfo(AuthenticationState authState)
    {
        if (authState.User.Identity.IsAuthenticated)
        {
            var user = authState.User;

            this.identityInformation = new IdentityInformation
            {
                DisplayName = user.Identity.Name,
                Email = (user.FindFirst("email")?.Value ?? ""),
                Oid = (user.FindFirst("oid")?.Value ?? "")
            };
        }
        else
        {
            this.identityInformation = default;
        }
    }

    private readonly AuthenticationStateProvider authenticationStateProvider;
    private IdentityInformation identityInformation = default;

}

在主布局.razor的底部：

@code {
    [Inject]
    public IIdentityBroker IdentityBroker { get; set; }

    protected override async Task OnInitializedAsync()
    {       
        await IdentityBroker.GetIdentityInfoAsync();
        await base.OnInitializedAsync();
    }
}

---

我的问题是像OnInitializedAsync这样的生命周期方法只被调用一次，但我要寻找的是每次导航到组件时都会被调用的方法，这样我就可以检查authState，并且每次调用OnAfterRenderAsync时都只能在页面完成后调用rendered@user2857208这就是我订阅的原因

authenticationStateProvider.AuthenticationStateChanged+=authenticationStateProvider\u AuthenticationStateChanged

@attribute[Authorize]在您导航到的任何页面上都会检查身份验证状态。您能否详细说明事件是如何触发的？页面上的@attribute[Authorize]不会触发获取身份验证状态