问在Active中保存用户列表时调用错误

EN

private string AddUsers(HttpPostedFileBase file)
    {
        string tempFileName = string.Format("{0}_{1}", Guid.NewGuid(), Path.GetFileName(file.FileName));
        string filePath = Path.Combine(Server.MapPath("~/AD_App_Data/temp"), tempFileName);

        file.SaveAs(filePath);

        FileInfo tempFileInfo = new FileInfo(filePath);
        List<string[]> tempFileData = new List<string[]>();
        List<string> lines = new List<string>();

        using (StreamReader reader = new StreamReader(tempFileInfo.FullName, true))
        {
            string line = string.Empty;

            while ((line = reader.ReadLine()) != null)
            {
                string[] splitter = line.Split(';');

                lines.Add(line);
                tempFileData.Add(splitter);
            }
        }

        tempFileInfo.Delete();

        if ((tempFileData[0][0].ToLower() != "samaccountname") ||
            (tempFileData[0][1].ToLower() != "displayname"))
        {
            return "Error! sAMAccountName or displayName fields not found!";
        }

        List<string> users = new List<string>();

        try
        {
            string LDAPContextPath = string.Format(
                "LDAP://{0}/{1}",
                ActiveDirectoryManage.GetServerName(),
                ActiveDirectoryManage.GetLDAPUserPath());
            List<string> newUsersPassword = new List<string>();

            foreach (string[] data in tempFileData.Skip(1))
            {
                if (impersonateValidUser("Administrator", ActiveDirectoryManage.GetDomainName(), "abcd,1234"))
                {
                    using (DirectoryEntry context = new DirectoryEntry(LDAPContextPath, "Administrator", "abcd,1234"))
                    {
                        users.Add(System.Security.Principal.WindowsIdentity.GetCurrent().Name);
                        using (DirectoryEntry userEntry = context.Children.Add(string.Format("CN={0}", data[1]), "user"))
                        {
                            userEntry.Properties["sAMAccountName"].Value = data[0];
                            userEntry.CommitChanges();

                            for (int i = 1; i < data.Length; i++)
                            {
                                int number;

                                if (int.TryParse(data[i], out number))
                                {
                                    userEntry.Properties[tempFileData[0][i]].Value = number;
                                }
                                else
                                {
                                    userEntry.Properties[tempFileData[0][i]].Value = data[i];
                                }

                                userEntry.CommitChanges();
                            }

                            string newPassword = Membership.GeneratePassword(12, 0);

                            userEntry.Invoke("SetPassword", newPassword);
                            userEntry.CommitChanges();
                            newUsersPassword.Add(newPassword);
                            userEntry.Properties["userAccountControl"].Value = 512;
                            userEntry.CommitChanges();
                        }
                    }
                    undoImpersonation();
                }
                else
                {
                    return "Error! Impersonation Failed";
                }
            }


            string timestamp = string.Format(
                "{0}{1}{2}-{3}{4}{5}",
                DateTime.Today.Hour, DateTime.Today.Minute, DateTime.Today.Second,
                DateTime.Today.Day, DateTime.Today.Month, DateTime.Today.Year);
            string doneFileName = string.Format("{0}_{1}.csv", file.FileName, timestamp);
            string donePath = Path.Combine(Server.MapPath("~/AD_App_Data/done"), doneFileName);

            using (StreamWriter writer = new StreamWriter(donePath))
            {
                writer.WriteLine(AppendPassword(lines[0], "password"));

                for (int i = 1; i < lines.Count; i++)
                {
                    writer.WriteLine(AppendPassword(lines[i], newUsersPassword[i - 1]));
                }
            }

            return doneFileName;
        }
        catch (Exception ex)
        {
            string error = "Error! Exception! " + ex.Message + "\n\n";

            foreach (string s in users)
            {
                error = error + s + "\n\n";
            }

            return error;
        }
    }