How to check if a user is authenticated in ASP.NET Core

Question

I understand that User.Identity.IsAuthenticated must be true to check if a user is authenticated. I am however, unsure of which of these properties can be null. So I currently have this code:

if (User?.Identity?.IsAuthenticated == true)
{
    // ...
}

Is that correct? Or can any of the null conditional operators be omitted?

Answer 1

If you're using ASP MVC (also aspnet core) the User.Identity is always set. If a user hasn't been authenticated the identity will have no name and IsAuthenticated will be false, so you are safe using

if(User.Identity.IsAuthenticated)
...

Answer 2

Try with:

if(User.Identity.IsAuthenticated)
{
    //..
}

If it isn't valid then User.Identity will be null.