程序代码：

Random R = new Random();
            int r = 1;
            for (int i = 1; i < 1000; i++)
            {
                Thread.Sleep(500);
                r = R.Next(1, 7);
                switch (r)
                {
                    case 1:
                        Console.BackgroundColor = ConsoleColor.Yellow;
                        Console.ForegroundColor = ConsoleColor.DarkRed;
                        break;
                    case 2:
                        Console.BackgroundColor = ConsoleColor.White;
                        Console.ForegroundColor = ConsoleColor.Black;
                        break;
                    case 3:
                        Console.BackgroundColor = ConsoleColor.Red;
                        Console.ForegroundColor = ConsoleColor.Green;
                        break;
                    case 4:
                        Console.BackgroundColor = ConsoleColor.Green;
                        Console.ForegroundColor = ConsoleColor.Red;
                        break;
                    case 5:
                        Console.BackgroundColor = ConsoleColor.Blue;
                        Console.ForegroundColor = ConsoleColor.Gray;
                        break;
                    case 6:
                        Console.BackgroundColor = ConsoleColor.Magenta;
                        Console.ForegroundColor = ConsoleColor.White;
                        break;
                }
            }
            Console.ReadKey();