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How do I redirect users to the login page when a session has timed out in Blazor?

Platform: Blazor| Category: General

To redirect users to your login page when their session has expired, create a RedirectLogin Razor component and implement the AuthenticationState to check whether sessions are expired or valid.
Follow these steps to redirect to a login page when sessions time out in Blazor:

Create a RedirectLogin component to redirect users to a login page when their session has expired.


@inject NavigationManager UriHelper
 @code {
     public Task<AuthenticationState> StateAuthenticate { get; set; }
     protected override async Task OnInitializedAsync()
         var authenticationState = await StateAuthenticate;
         if (authenticationState?.User?.Identity is null || !authenticationState.User.Identity.IsAuthenticated)
             var returnUri = UriHelper.ToBaseRelativePath(UriHelper.Uri);
             if (string.IsNullOrWhiteSpace(returnUri))
                 UriHelper.NavigateTo("YourLoginPath", true);
                 UriHelper.NavigateTo($"YourLoginPath?returnUrl={returnUri}", true);

Now, initialize the RedirectLogin component in App.razor to identify whether a session is expired or valid.


<Router AppAssembly="@typeof(Program).Assembly">
	<Found Context="routeData">
		<AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
				<RedirectLogin />
			// . . .
	// . . .

View Sample in GitHub

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