Get current (logged) user in ASP.NET Core 3.0 .razor page

Question

I\'m testing the waters with a blazer server-side app and trying to get the logged user in a .razor page. This

UserManager.GetUserAsync(User)

Answer 1

If you surround your code with the AuthorizeView component you can get access to a context object that supplies the current user.

    
        
Hello, @context.User.Identity.Name!
        
You can only see this content if you're authenticated.
    
    
        
Authentication Failure!
        
You're not signed in.
    

If you don't want to use that approach you can request a cascading parameter called authenticationStateTask, which is provided by the CascadingAuthenticationState.

@page "/"

Log username

@code {
    [CascadingParameter]
    private Task authenticationStateTask { get; set; }

    private async Task LogUsername()
    {
        var authState = await authenticationStateTask;
        var user = authState.User;

        if (user.Identity.IsAuthenticated)
        {
            Console.WriteLine($"{user.Identity.Name} is authenticated.");
        }
        else
        {
            Console.WriteLine("The user is NOT authenticated.");
        }
    }
}