arraylist 的 contains问题（在线等）

ArrayList categoryIDList = new ArrayList();

string[] strKeyList = new string[2];
            strKeyList[0] = row.Cells[1].Text;
            strKeyList[1] = ((Label)row.Cells[4].FindControl("labType")).Text;

categoryIDList.add(strKeyList)

然后categoryIDList.Contains(strKeyList)
为什么每次都是返回false？

求教！ --------------------编程问答-------------------- 怎么我这边测试是true呢?

categoryIDList.add(strKeyList) 
里的add应该是Add,是不是你那儿执行,没有把strKeyList加到categoryIDList里? --------------------编程问答-------------------- 同一楼上的这里的结果也是

categoryIDList.Contains(strKeyList)  true bool
不过，编译能通过？？（add）
--------------------编程问答--------------------

ArrayList categoryIDList = new ArrayList();

        string[] strKeyList = new string[2];

        strKeyList[0] = "a";

        strKeyList[1] = "b";

        categoryIDList.Add(strKeyList);

        bool a= categoryIDList.Contains(strKeyList);

我测试返回的也是true啊 --------------------编程问答-------------------- 我调了一下，结果也是很奇怪
明明categoryIDList是有个object的，而且就是和strKeyList一样，但是就是Contains老是返回假 --------------------编程问答-------------------- 原代码
#region//为保持翻页后checkbox状态，记录下当前状态
    private void RememberOldValues()
    {

        ArrayList categoryIDList = new ArrayList();

        foreach (GridViewRow row in dlResult.Rows)
        {
            //string strKeyList="";
            //strKeyList = row.Cells[1].Text + ((Label)row.Cells[4].FindControl("labType")).Text;

            //test
            string[] strKeyList = new string[2];
            strKeyList[0] = row.Cells[1].Text;
            strKeyList[1] = ((Label)row.Cells[4].FindControl("labType")).Text;

            //index = (int)dlResult.DataKeys[row.RowIndex].Value;
            bool result = ((CheckBox)row.FindControl("chboxChoose")).Checked;

            // Check in the Session
            if (Session["CHECKED_ITEMS"] != null)
                categoryIDList = (ArrayList)Session["CHECKED_ITEMS"];
            if (result)
            {


                if (!categoryIDList.Contains(strKeyList))

                    categoryIDList.Add(strKeyList);
            }
            else
                categoryIDList.Remove(strKeyList);
        }
        if (categoryIDList != null && categoryIDList.Count > 0)
            Session["CHECKED_ITEMS"] = categoryIDList;
    }
    #endregion

    #region//还原checkbox状态
    private void RePopulateValues()
    {
        ArrayList categoryIDList = (ArrayList)Session["CHECKED_ITEMS"];
        if (categoryIDList != null && categoryIDList.Count > 0)
        {
            foreach (GridViewRow row in dlResult.Rows)
            {
                //string strKeyList = "";
                //strKeyList = row.Cells[1].Text + ((Label)row.Cells[4].FindControl("labType")).Text;

                //test
                string[] strKeyList = new string[2];
                strKeyList[0] = row.Cells[1].Text;
                strKeyList[1] = ((Label)row.Cells[4].FindControl("labType")).Text;

                if (categoryIDList[0] == strKeyList)
                {
                    CheckBox myCheckBox = (CheckBox)row.FindControl("chboxChoose");
                    myCheckBox.Checked = true;
                }
            }
        }
    }
    #endregion

补充：.NET技术 ,  C#