两数组相比筛选数据

static void Main(string[] args)
        {
            int[] a = new int[] { 2, 4, 5, 7, 8 };
            int[] b = new int[] { 9, 4, 5, 6, 7, 8 };
            //不要用数组 老出错
              ArrayList alist = new ArrayList(a);
              ArrayList blist = new ArrayList(b);
            ArrayList same = new ArrayList();
            ArrayList aDif = new ArrayList();
            ArrayList bDif = new ArrayList();

           foreach(object o in alist)
           {
               if (blist.Contains(o))
               {
                   same.Add(o);
               }
               else {
                   aDif.Add(o);
               }
           }
           
            foreach (object o in blist)
           {
               if (!same.Contains(o))
               {
                   bDif.Add(o);
               }
           }


            Console.WriteLine("相同的");
            foreach (Object o in same)
                Console.Write("   {0}", o);
            Console.WriteLine();
            Console.WriteLine("a中特有的");
            foreach (Object o in aDif)
                Console.Write("   {0}", o);
            Console.WriteLine();
            Console.WriteLine("b中特有的");
            foreach (Object o in bDif)
                Console.Write("   {0}", o);

            Console.Read();
        }