Redirect to different part of application in Blazor if user is not authenticated

user_123597 0
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I'm trying to define a Blazor website that has complete navigation to present the application for non-authenticated users and another completely different navigation for authenticated users.

The idea is that non-authenticated users get to a part of the website that allows anonymous users, with a complete set of pages and navigation. Once they log in, they get to another part of the website which is only for authenticated users with its own navigation.

In addition, I might have two different sets of navigation based on the roles of the users.

For example, an admin might have other views and menus than a standard user.

I have looked at the Routing and navigation documentation, but can't find anything that would allow me to redirect the user based on its authentication state or role to another sub-route with its own MainLayout, etc.

blazor-server-side blazor authentication c#
2 Answers

  • App.razor:

      <CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly">
      <Found Context="routeData">
          <AuthorizeRouteView RouteData="@routeData" 
              DefaultLayout="@typeof(MainLayout)" />
      </Found>
      <NotFound>
          <LayoutView Layout="@typeof(MainLayout)">
              <p>Sorry, there's nothing at this address.</p>
          </LayoutView>
      </NotFound>
   </Router>
</CascadingAuthenticationState>

  • NavMenu.razor

    <AuthorizeView>
   <Authorized>
      @* For authorized users *@
      <nav>...</nav>
   </Authorized>
   <NotAuthorized>
      @* For unauthorized users *@
      <nav>...</nav>
   </NotAuthorized>
</AuthorizeView>

  • Don't forget to add in Startup or program file this two lines.

    app.UseAuthentication();
app.UseAuthorization();

Microsoft doc

user_132563460

Take a look at this code:

    [Inject]
    public NavigationManager Navigator { get; set; }

    [Inject]
    private IHttpContextAccessor HttpContextAccessor { get; set; }

    public void DoSomething()
    {
        if (HttpContextAccessor.HttpContext.User.Identity.IsAuthenticated)
        {
            Navigator.NavigateTo("/SecretPage");
        }
        else
        {
            Navigator.NavigateTo("/PublicPage");
        }
    }

Don't forget to add this to your startup file: services.AddHttpContextAccessor(); That will make sure IHttpContextAccessor can be injected.

NaviationManager does not need to be manually injected.

user_70811760
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