static void Main()
{
var users = new LinkedList <User2>();
var hans = new User2
{
Name = "Hans",
AgeInYears = 30
};
users.AddToFront(hans);
Console.WriteLine("default: " + users.ToString());
Console.WriteLine("custom: " + users.ToString(FormatUser));
string userAges = users.ToString((User2 u) => u.AgeInYears.ToString());
Console.WriteLine("age only: " + userAges);
Console.ReadKey();
}
static string FormatUser(User2 user)
{
return(user.Name + " (" + user.AgeInYears + ")");
}