有兴趣的运行一下

class Program
    {
        static int counter = 0;
        static string displayString = "This string will appear one letter at a time ";
        static void Main(string[] args)
        {
            Timer myTimer = new Timer(100);
            myTimer.Elapsed += new ElapsedEventHandler(WriteChar);
            myTimer.Start();
            Console.ReadKey();
        }
        static void WriteChar(object source, ElapsedEventArgs e)
        {
            Console.Write(displayString[counter++%displayString.Length]);
        }
    }