在我的基于ASP.NET的基于Web的应用程序中，我有一个普通的ASP.NET按钮，后面有一个方法用于发送电子邮件，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，我想使用：
，而不是使用<asp:Button>
<ajaxToolkit:ConfirmButtonExtender ID="btnSendReminders" runat="server" TargetControlID="btnSendReminders"
ConfirmText="Are you sure you want to click this?"
OnClientCancel="CancelClick" />
拥有ConfirmMessage。但我不知道为什么会出现以下错误： **
扩展程序控制'btnSendReminders'无法扩展'btnSendReminders'。 “AjaxControlToolkit.ConfirmButtonExtender”类型的扩展程序控件 无法扩展类型的控件 'AjaxControlToolkit.ConfirmButtonExtender'。
我不知道为什么。那么我该如何使用它而不是<asp:button>？
更新
我刚想出如何使用它。我应该使用它如下：
<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>
但现在问题是当出现确认消息时，单击取消按钮，页面将刷新，并且将发送提醒。 如果在点击取消按钮时如何防止这种情况？
答案 0 :(得分：2)
您可以使用客户端返回确认来执行相同的操作
<asp:Button ID="btnSendReminders" OnClientClick="javascript:return confirm('Are you sure you want to proceed?')" runat="server" Text="Send Reminders" OnClick="btnSendReminders_Click" />
答案 1 :(得分：2)
使用以下代码确认按钮ajax扩展器以获取确认框：
<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?"
/>