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How do I redirect a page to the login if the user is not authenticated in Blazor WebAssembly?

Platform: Blazor| Category : General, WebAssembly

To redirect to the login page when a user is not authenticated in Blazor WebAssembly:

  • Create a login page component.
  • Add the login page component to the NotAuthorized tag.
Follow these steps to redirect to the login page if the user is not authenticated:

  1. Create a login page component for redirection.
    [LoginRedirect.razor]

    @inject NavigationManager UriHelper
    @code {
        protected override void OnInitialized()
        {
            UriHelper.NavigateTo("login");
        }
    }

  2. Now add the LoginRedirect component to the NotAuthorized tag to redirect to the login page if the user is not authorized.
    [App.razor]

    <Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
            <Found Context="routeData">
                <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                    <NotAuthorized>
                        <LoginRedirect />
                    </NotAuthorized>
                </AuthorizeRouteView>
            </Found>
            <NotFound>
                <LayoutView Layout="@typeof(MainLayout)">
                    <p>Sorry, there's nothing at this address.</p>
                </LayoutView>
            </NotFound>
        </Router>
    Refer to this documentation for more details.

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