switch case

            Console.WriteLine("1土豆");
            Console.WriteLine("2玉米");
            Console.WriteLine("3小麦");
            Console.WriteLine("4黄瓜");
            Console.Write("请输入你选的：");
            string s = Console.ReadLine();
            switch (s)
            {
                case "":
                    Console.WriteLine("你选择1");
                    break;
                case "":
                    Console.WriteLine("你选择2");
                    break;
                case "":
                    Console.WriteLine("你选择3");
                    break;
                case "":
                    Console.WriteLine("你选择4");
                    break;
                default:
                    Console.WriteLine("选择有误！");
                    break;

            }