string input = "Hello World!";char[] values = input.ToCharArray();foreach (char letter in values){ // Get the integral value of the character. int value = Convert.ToInt32(letter); // Convert the decimal value to a hexadecimal value in string form. string hexOutput = String.Format("{0:X}", value); Console.WriteLine("Hexadecimal value of {0} is {1}", letter, hexOutput);以上为字符转为16进制；