动态数组ADD和REMOVE不太明白。
以前人留下来的。有点不太懂。看看代码

C# code

 public string SyncUserInfor(HttpResponse Response)    {        GC.Collect();        string jsBlock;        StringBuilder sbLog = new StringBuilder();        sbLog.Append(" 开始时间：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm")+ "；");                DBOperator db = new DBOperator();        //jsBlock = "<script>SetPorgressBar('开始读取数据库数据 ','0'); </script>";        //Response.Write(jsBlock);        //Response.Flush();        int begin = Environment.TickCount;        DataTable HRUserInfor = db.GetHRUserInfor();        int end = Environment.TickCount;        sbLog.Append(string.Format(" 获取数据库：{0}毫秒",end-begin));        //jsBlock = "<script>SetPorgressBar('开始读域数据 ','0'); </script>";        //Response.Write(jsBlock);        //Response.Flush();        begin = Environment.TickCount;        ArrayList XMLUserInfor = xmlOperate.GetXMLInfor("0");        end = Environment.TickCount;        sbLog.Append(string.Format(" 获取域中所有信息：{0}毫秒", end - begin));        ArrayList userProhibited = new ArrayList();        ArrayList userModify = new ArrayList();        ArrayList userModifyLog = new ArrayList();        DataTable userAddTable = HRUserInfor;        ArrayList MoveOUList = new ArrayList();        DBOperator.SyncLog sl = new DBOperator.SyncLog();        string UpdateNo = db.GetUpdateNo();        int ModifyCount, AddCount, LeaveCount, totalCount, dataCount;        totalCount = XMLUserInfor.Count;        dataCount = HRUserInfor.Rows.Count;        sl.UpdateNo = UpdateNo;        if (XMLUserInfor != null)        {            for (int i = 0; i < XMLUserInfor.Count; i++)            {                userProhibited.Add((userInfor)XMLUserInfor[i]);            }            int count = XMLUserInfor.Count;               for (int i = 0; i < count; i++)            {                                   userInfor user = (userInfor)XMLUserInfor[i];                DataRow[] drlist = HRUserInfor.Select(string.Format("samAccountName='{0}'", user.samAccountName));                DataRow dr = null;                if (drlist.Length < 1) continue;                dr = drlist[0];                userProhibited.Remove(user);            }            if (userProhibited.Count != 0)            {                                for (int i = 0; i < userProhibited.Count; i++)                {                    userInfor user = (userInfor)userProhibited[i];                    if (!user.samAccountName.EndsWith("_tmp"))                    {                        LeaveCount += 1;                        op.ProhibitedUser(user.samAccountName);                        DBOperator.SyncLog log = new DBOperator.SyncLog();                        log.UpdateLevel = DBOperator.UpdateLevel.Hint;                        log.UpdateType = DBOperator.UpdateType.Prohibit;                        WriteLog(log, user);                    }                }            }        sbLog.Append("离职个数：" + LeaveCount + "；");        }                

主要是userProhibited 这个动态数组。在FOR循环ADD。在后面一个FOR循环又REMOVE，之后不是userProhibited.COUNT = 0 吗？为什么后面又有个if (userProhibited.Count != 0) 。而且我调试后。后面这串确实有运行。难道userProhibited.Count != 0 这个是TRUE???? 求助。

[解决办法]
Remove前是有条件的，if (drlist.Length < 1) continue;不满足就不会删除，他是要根据 XMLUserInfor去获取 drlist
[解决办法]
userProhibited.Remove(user);不是每次循环都会执行的
DataRow[] drlist = HRUserInfor.Select(string.Format("samAccountName='{0}'", user.samAccountName));
的drlist>0的时候才会remove么,<1的话会continue.