App.razor

@using Microsoft.AspNetCore.Components.Authorization

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(App).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <Authorizing>
                    <MudText>登陆中...</MudText>
                </Authorizing>
                <NotAuthorized>
                    <MudText>未登录</MudText>
                </NotAuthorized>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <PageTitle>Not found</PageTitle>
            <LayoutView Layout="@typeof(MainLayout)">
                <p role="alert">Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>   
</CascadingAuthenticationState>