作业代码：

        Console.WriteLine("欢迎进入魔法师迷你游戏平台");
        Console.WriteLine("请选择您喜爱的游戏：");
        Console.WriteLine("****************************************");
        Console.WriteLine(@"
                1.斗地主
                2.斗牛
                3.泡泡龙
                4.连连看");
        Console.WriteLine("****************************************");
        Console.Write("请选择：");

        string str_num = Console.ReadLine();
        try
        {
            int num = Convert.ToInt32(str_num);
            switch (num)
            {
                case 1:
                    Console.WriteLine("你已进入斗地主房间");
                    break;
                case 2:
                    Console.WriteLine("你已进入斗牛房间");
                    break;
                case 3:
                    Console.WriteLine("你已进入泡泡龙房间");
                    break;
                case 4:
                    Console.WriteLine("你已进入连连看房间");
                    break;
                default:
                    Console.WriteLine("你输入的数字有误");
                    break;
                    
            }
           
        }
        catch
        {
            Console.WriteLine("你输入的不是数字，请退出重新登录");
        }
       

        Console.ReadKey();