去除重复记录

String[] arrstr = new String[] { "1", "2", "3", "2", "3", "4", "5", "6", "1", "7", "8", "2", "3", "4", };
/// <summary>
    /// 移除数组中重复的项
    /// </summary>
    /// <param name="arr"></param>
    /// <returns></returns>
    private Hashtable RemoveSame(String[] arr)
    {
        Hashtable ht = new Hashtable();
        for (int i = 0; i < arr.Length; i++)
        {
            if (ht[arr[i].ToString()] == null)
            {
                ht[arr[i].ToString()] = arr[i];
            }
        }
        return ht;
    }

 

 

/// <summary>
    /// 移除数组中重复的项
    /// </summary>
    /// <param name="arr"></param>
    /// <returns></returns>
    private ArrayList RemoveSame(String[] arr)
    {
        Hashtable ht = new Hashtable();

　　ArrayList al=new ArrayList ();
        for (int i = 0; i < arr.Length; i++)
        {
            if (ht[arr[i].ToString()] == null)
            {
                ht[arr[i].ToString()] = arr[i];

　　　　al.add(arr[i]);
            }
        }
        return al;
    }

RemoveSame(arrstr);