try_catch异常捕获

        static void Main(string[] args)
        {
            int intNum = 0;
            bool bFlag = true;
            Console.WriteLine("请输入一个数字:");
            try
            {
                intNum = Convert.ToInt32(Console.ReadLine());
            }
            catch 
            {
                Console.WriteLine("输入数据异常,程序退出!");
                bFlag = false;
            }
            if (bFlag)
            {
                Console.WriteLine("the number is:{0}", intNum);
            }
            Console.ReadKey();

        }