//去重复方法一
        private ArrayList RemoveDuplicateNum(ArrayList list)
        {
            list.Sort();
            for (int i = 0; i < list.Count - 1; i++)
            {
                if (list[i].Equals(list[i + 1]))
                {
                    list.RemoveAt(i);//去重复项  
                    i--;
                }
            }
            return list;

        }
        //去重复方法二
        private ArrayList RemoveSame(ArrayList list)
        {
            //上面写的那句是多余的，这个是最终的  
            for (int i = 0; i < list.Count - 1; i++)
            {
                for (int j = i + 1; j < list.Count; j++)
                {
                    if (list[i].Equals(list[j]))
                    {
                        list.RemoveAt(j);
                        j--;
                    }
                }
            }
            return list;
        }