razor

@inject IVisibilityService VisibilityService

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                    <h1>Access Denied</h1>
                    <p>You are not authorized to access this resource.</p>
                </NotAuthorized>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p role="alert">Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

@code {
    private bool isActiveTab = true;

    protected override async Task OnInitializedAsync()
    {
        VisibilityService.OnVisible += OnTabVisible;
        VisibilityService.OnHidden += OnTabHidden;
        await VisibilityService.Initialize();
    }

    private async void OnTabVisible()
    {
        // Example logic when tab becomes visible
        Console.WriteLine("Tab is visible");
    }

    private async void OnTabHidden()
    {
        // Example logic when tab becomes hidden
        Console.WriteLine("Tab is hidden");
    }
}

it keeps giving me an error:
“RZ1006 The code block is missing a closing “}” character. Make sure you have a matching “}” character for all the “{” characters within this block, and that none of the “}” characters are being interpreted as markup. ”
as if he didn’t like the mountain of code itself

I want to add logic that if the tab is not active, it should close the thread so as not to waste memory.