checked关键字

        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            
            // TODO: Implement Functionality Here
            unchecked{
                int  x=260;
            byte z=(byte)x;
            Console.Write("Press any key to continue . . . "+z);   //结果为z=4不报溢出错误
            }
            
            
            Console.ReadKey(true);
        }