How can I make accessing my custom IPrincipal easier in ASP.NET MVC?

Question

I\'ve written a custom principal object which contains a few additional fields (email and userid in addition to the username).

In order to access these properties I have

Answer 1

You could also make extension methods for the Email and UserID in the same fashion as John Kalberer's answer:

public static class CustomPrincipalExtensions
{
    public static string Email(this CustomPrincipal cUser)
    {
        return cUser != null ? cUser.Email : "Default Email"
    }

    public static string UserID(this CustomPrincipal cUser)
    {
        return cUser != null ? cUser.UserID : "Default ID"
    }
}