c# - 如何使用 AjaxToolKit 确认按钮扩展器？

Question

在我基于 ASP.NET 网络的应用程序中，我有一个普通的 ASP.NET 按钮，它背后有一个发送电子邮件的方法，如下所示:

ASP.NET 代码:

<asp:Button ID="btnSendReminders" runat="server" Text="Send Reminders" OnClick="btnSendReminders_Click"  />

代码隐藏:

protected void btnSendReminders_Click(object sender, EventArgs e)
        {
            SendEmailTOAllUser();
        }


        protected void SendEmail(string toAddresses, string fromAddress, string MailSubject, string MessageBody, bool isBodyHtml)
        {
            SmtpClient sc = new SmtpClient("Mail Server");
            try
            {
                MailMessage msg = new MailMessage();
                msg.From = new MailAddress("pssp@aramco.com", "PMOD Safety Services Portal (PSSP)");

                // In case the mail system doesn't like no to recipients. This could be removed
                //msg.To.Add("psTeesstp@DomainServer.com");

                msg.Bcc.Add(toAddresses);
                msg.Subject = MailSubject;
                msg.Body = MessageBody;
                msg.IsBodyHtml = isBodyHtml;
                sc.Send(msg);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }

        protected void SendEmailTOAllUser()
        {
            string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspForTest;Integrated Security=True";

            using (SqlConnection conn = new SqlConnection(connString))
            {
                var sbEmailAddresses = new System.Text.StringBuilder(2000);
                string quizid = "";

                // Open DB connection.
                conn.Open();

                string cmdText = "SELECT MAX (QuizID) As mQuizID FROM dbo.QUIZ WHERE IsSent <> 0";
                using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                {
                    SqlDataReader reader = cmd.ExecuteReader();
                    if (reader != null)
                    {
                        while (reader.Read())
                        {
                            // There is only 1 column, so just retrieve it using the ordinal position
                            quizid = reader["mQuizID"].ToString();

                        }
                    }
                    reader.Close();
                }

                string cmdText2 = @"SELECT e.Username, d.DivisionShortcut
                                FROM
                                  employee e
                                  join Divisions d on (e.DivisionCode = d.SapCode)
                                  left join 
                                    (select A.QuizID, a.Username 
                                     from UserQuiz a join 
                                     (select max(QuizID) QuizID from dbo.Quiz where IsSent=1) b
                                     on a.QuizId = b.QuizID
                                     ) c
                                   on e.Username = c.Username
                                 WHERE c.QuizID is null
                                 Order By d.DivisionShortcut";
                using (SqlCommand cmd = new SqlCommand(cmdText2, conn))
                {
                    SqlDataReader reader = cmd.ExecuteReader();
                    if (reader != null)
                    {
                        while (reader.Read())
                        {
                            var sName = reader.GetString(0);
                            if (!string.IsNullOrEmpty(sName))
                            {
                                if (sbEmailAddresses.Length != 0)
                                {
                                    sbEmailAddresses.Append(",");
                                }
                                // Just use the ordinal position for the user name since there is only 1 column
                                sbEmailAddresses.Append(sName).Append("@DomainServer.com");
                            }
                        }
                    }
                    reader.Close();


                    // Add the parameter to the command
                    var oParameter = cmd.Parameters.Add("@QuizID", SqlDbType.Int);


                    var sEMailAddresses = sbEmailAddresses.ToString();
                    string link = "<a href='http://StartQuiz.aspx?testid=" + quizid + "'> Click here to participate </a>";
                    string body = @"<font color='red' size='18pt'><b> ***REMINDER*** </b></font> <br /><br /> 
                                Good day, <br /><br />
                                <b>This is just a gentle reminder asking you to participate in the last new short safety quiz </b>"
                                    + link +
                                    @"<br /><br />
                                Also, give yourself a chance to gain more safety culture by reading the PMOD Newsletter.
                                <br /><br /><br />
                                PLEASE <span class='highlight'>IGNORE</span> THIS MESSAGE IF YOU HAVE ALREADY PARTICIPATED IN THIS QUIZ.
                                <br /> <br /><br /> <br />
                                This email was generated using the <a href='http://pmv/pssp/Default.aspx'>Safety Portal (PSSP) </a>. 
                                Please do not reply to this email.";

                    int sendCount = 0;
                    List<string> addressList = new List<string>(sEMailAddresses.Split(','));
                    StringBuilder addressesToSend = new StringBuilder();

                    for (int userIndex = 0; userIndex < addressList.Count; userIndex++)
                    {
                        sendCount++;
                        if (addressesToSend.Length > 0)
                            addressesToSend.Append(",");

                        addressesToSend.Append(addressList[userIndex]);
                        if (sendCount == 10 || userIndex == addressList.Count - 1)
                        {
                            SendEmail(addressesToSend.ToString(), "", "REMINDER: Notification of New Weekly Safety Quiz", body, true);
                            addressesToSend.Clear();
                            sendCount = 0;
                        }
                    }


                    // Update the parameter for the current quiz
                    oParameter.Value = quizid;
                    // And execute the command
                    cmd.ExecuteNonQuery();

                }
                conn.Close();
            }
        }

现在，不用 <asp:Button> ，我想使用:

 <ajaxToolkit:ConfirmButtonExtender ID="btnSendReminders" runat="server" TargetControlID="btnSendReminders"
                                                ConfirmText="Are you sure you want to click this?"
                                                OnClientCancel="CancelClick" />

有一个确认信息。但是我不知道为什么会出现以下错误:**

Extender control 'btnSendReminders' cannot extend 'btnSendReminders'. Extender controls of type 'AjaxControlToolkit.ConfirmButtonExtender' cannot extend controls of type 'AjaxControlToolkit.ConfirmButtonExtender'.

我也不知道为什么。那么我如何使用它而不是 <asp:button> ？

更新:

我刚刚弄清楚如何使用它。我应该按如下方式使用它:

<asp:Button ID="btnSendReminders" runat="server" Text="Send Reminders" OnClick="btnSendReminders_Click"  />
            <ajaxToolkit:ConfirmButtonExtender ID="ConfirmButtonExtender1" runat="server" TargetControlID="btnSendReminders"
                                                ConfirmText="Are you sure you want to send reminders to these employees?"
                                                OnClientCancel="CancelClick">
                                                </ajaxToolkit:ConfirmButtonExtender>

但现在的问题是，当出现确认信息时，点击取消按钮，页面仍然会刷新并发送提醒。 如何防止点击“取消”按钮的情况？

Answer 1

使用以下代码确认按钮 ajax 扩展器获取确认框:

  <asp:Button ID="btnSendReminders" runat="server" Text="Send Reminders" OnClick="btnSendReminders_Click"  />
<ajaxToolkit:ConfirmButtonExtender ID="cbe" runat="server"
   TargetControlID="btnSendReminders"
    ConfirmText="Are you sure you want to Send Reminders?"
    />