Convert.ToByte((int)val)

        static void Main(string[] args)
        {
            object val = 134;
            
            byte bit8 = Convert.ToByte((int)val);
            Console.WriteLine("[{0}],[{1:X}]", bit8, bit8);

            string ALCD = "86";
            byte bit = Convert.ToByte(ALCD,16);
            Console.WriteLine((bit8 == bit));


            /*
[134],[86]
True
请按任意键继续. . .
             */
        }