App.razor

<Router AppAssembly="@typeof(Program).Assembly">
    <Found Context="routeData">
        <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
            <NotAuthorized>
                @{
                    NavMgr.NavigateTo("/login");
                }
            </NotAuthorized>            
        </AuthorizeRouteView>
    </Found>
    <NotFound>
        <CascadingAuthenticationState>
            <LayoutView Layout="@typeof(NotFoundLayout)">
                <p>Oops! That page wasn't found! You may want to return <a href="/">Home</a></p>
            </LayoutView>
        </CascadingAuthenticationState>
    </NotFound>
</Router>