Blazor - redirect to login when unauthorized https://www.iambacon.co.uk/blog/blazor-authentication-and-authorisation-redirect-to-login

App.razor

<CascadingAuthenticationState>
    <Router AppAssembly="typeof(App).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(MainLayout)">
                <Authorizing>
                </Authorizing>
                <NotAuthorized>
                    <RedirectToLogin />
                </NotAuthorized>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="typeof(MainLayout)">
                <h1>Page not found</h1>
                <p>Sorry, but there's nothing here!</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

RedirectToLogin.cs

using Microsoft.AspNetCore.Components;

namespace RenewPlus.Web.Shared.Components.Shared
{
    public class RedirectToLogin : ComponentBase
    {
        [Inject]
        protected NavigationManager NavigationManager { get; set; }

        protected override void OnInitialized()
        {
            NavigationManager.NavigateTo("login");
        }
    }
}

Thank you! I needed this

If you got Navigation error on NavigationManager.NavigateTo

you can use OnAfterRender instead of OnInitialized

See [https://stackoverflow.com/a/58077203](this StackOverflow answer)