public bool IsDistinctALObj(ArrayList arr)//判斷 ArrayList內元素是否都為不重複元素
{
    bool blnAns = true;
    ArrayList lst = new ArrayList();
    for (int i = 0; i < arr.Count; i++)
    {
        if (lst.Contains(arr[i]))
        {
            blnAns = false;
            break;
        }
        else
        {
            lst.Add(arr[i]);
        }
    }
    return blnAns;
}