Redirect user to Login page with message

Question

I need to display a message to a user if he or she is not registered or signed up before accessing a page

[Authorize]
public ActionResult LearningTopics()
{

}

As it is now the user is directed to the login page.

How can I determine as to whether the user was directed to the Login page because of the [Authorize] attribute so that I can display a message like 'Please login to access learner topics.'

Answer 1

You could check the Return URL Parameter on the page in either the server code or the view code to determine if the page was redirected or not.

For example, if your return URL parameter was returnUrl then in the log in route you could do

if (!String.IsNullOrEmpty(returnUrl)) { 
    // add a message "Please register" to the view.
}