SMTP 异常需要在本地服务器中显示错误消息时使用的 try-catch 块
本文关键字：消息 错误 try-catch 显示 异常 服务器 SMTP | 更新日期: 2023-09-27 18:36:18
每当使用端口时出现异常时都会使用smtp catch块，但它会抛出异常，这很好，it will take a very long time并且异常消息将直接显示在代码本身中，要求是在localserver中执行时显示错误消息，不应该出现在代码中。每当server关闭或invalid email Id或更改smtp port时，应该throw exception，结论是错误消息不应该直接进入代码。它应该显示一条错误消息并停止不应hang application。
protected void Button2_Click(object sender, EventArgs e)
{
//string vv;
//vv = (string)Session["FID"];
DateTime sdt = DateTime.Today;
SqlCommand cmd4 = new SqlCommand();
int flag=0;
String test = DateTime.Now.ToString("dd.MM.yyy");
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
{
string toemail = GridView1.Rows[i].Cells[2].Text;
string FID1 = GridView1.Rows[i].Cells[0].Text;
GridViewRow row = GridView1.Rows[i];
CheckBox Ckbox = (CheckBox)row.FindControl("CheckBoxMark1");
if (Ckbox.Checked == true)
{
sendMail(toemail);
flag = 1;
//ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email send Succesfully')</script>");
}
if (flag == 1)
{
ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email sent on " + test + "')</script>");
cn.Open();
//cmd4.CommandText = "Insert into TrackingFaculty_det (EmailsentDate) values (@EmailsentDate) WHERE FID=@FID";
cmd4.CommandText = "update TrackingFaculty_det SET EmailsentDate=@Email WHERE FID=@FID ";
cmd4.CommandType = CommandType.Text;
cmd4.Connection = cn;
cmd4.Parameters.Clear();
cmd4.Parameters.Add("@Email", SqlDbType.DateTime, 8);
cmd4.Parameters["@Email"].Value = sdt;
cmd4.Parameters.Add("@FID", SqlDbType.VarChar, 10);
cmd4.Parameters["@FID"].Value = FID1;
cmd4.ExecuteNonQuery();
cn.Close();
log.Debug("Info : Insert the Email Sent Date of the faculty");
}
else
{
ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email cannot be sent')</script>");
}
}
log.Debug("Info : Function used to send mail");
}
public void sendMail(String toemail)
{
try
{
MailMessage mail = new MailMessage();
mail.To.Add(toemail);
mail.From = new MailAddress("manipal.mcis1@gmail.com");
mail.Subject = "Remember Mail";
// string Body = "Please update profile";
//mail.Body = Body;
mail.Body = " Dear Sir/Madam 'n'n'n Please update your profile. . 'n'n'n Thanks & Regards 'n'n'n MCIS,Manipal.";
//mail.Body = "<html><body> <h2" + "align=center>Dear Sir/Madam" + "</h2> Please update ur profile</body></html>";
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 584;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential("manipal.mcis1@gmail.com", "manipal15");
smtp.EnableSsl = true;
smtp.Send(mail);
}
catch (SmtpException ex)
{
string msg = "Mail cannot be sent:";
msg += ex.Message;
log.Debug("Error: Inside catch block of Mail sending");
log.Error("Error msg:" + ex);
log.Error("Stack trace:" + ex.StackTrace);
throw new Exception(msg);
}
这也引发了另一个问题，即每当它进入循环for
执行 send(tomail)函数即使它与这个ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email sent on " + test + "')</script>");行一起无效，也会在每个实例中执行。我只需要在valid EmailID和适当的smtp port可用时才执行此操作。
试试这些代码行它会起作用
protected void Button2_Click(object sender, EventArgs e)
{
//string vv;
//vv = (string)Session["FID"];
DateTime sdt = DateTime.Today;
SqlCommand cmd4 = new SqlCommand();
int flag=0;
String test = DateTime.Now.ToString("dd.MM.yyy");
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
{
string toemail = GridView1.Rows[i].Cells[2].Text;
string FID1 = GridView1.Rows[i].Cells[0].Text;
GridViewRow row = GridView1.Rows[i];
CheckBox Ckbox = (CheckBox)row.FindControl("CheckBoxMark1");
if (Ckbox.Checked == true)
{
sendMail(toemail);
flag = 1;
//ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email send Succesfully')</script>");
}
if (flag == 1)
{
//ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Email sent on " + test + "')</script>");
cn.Open();
//cmd4.CommandText = "Insert into TrackingFaculty_det (EmailsentDate) values (@EmailsentDate) WHERE FID=@FID";
cmd4.CommandText = "update TrackingFaculty_det SET EmailsentDate=@Email WHERE FID=@FID ";
cmd4.CommandType = CommandType.Text;
cmd4.Connection = cn;
cmd4.Parameters.Clear();
cmd4.Parameters.Add("@Email", SqlDbType.DateTime, 8);
cmd4.Parameters["@Email"].Value = sdt;
cmd4.Parameters.Add("@FID", SqlDbType.VarChar, 10);
cmd4.Parameters["@FID"].Value = FID1;
cmd4.ExecuteNonQuery();
cn.Close();
log.Debug("Info : Insert the Email Sent Date of the faculty");
}
}
log.Debug("Info : Function used to send mail");
}
public void sendMail(String toemail)
{
try
{
MailMessage mail = new MailMessage();
mail.To.Add(toemail);
mail.From = new MailAddress("manipal.mcis1@gmail.com");
mail.Subject = "Remember Mail";
// string Body = "Please update profile";
//mail.Body = Body;
mail.Body = " Dear Sir/Madam 'n'n'n Please update your profile. . 'n'n'n Thanks & Regards 'n'n'n MCIS,Manipal.";
//mail.Body = "<html><body> <h2" + "align=center>Dear Sir/Madam" + "</h2> Please update ur profile</body></html>";
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential("manipal.mcis1@gmail.com", "manipal15");
smtp.EnableSsl = true;
smtp.Send(mail);
}
catch (SmtpException ex)
{
string msg = "Mail cannot be sent because of the server problem:";
msg += ex.Message;
log.Debug("Error: Inside catch block of Mail sending");
log.Error("Error msg:" + ex);
log.Error("Stack trace:" + ex.StackTrace);
Response.Write(msg);
//throw new Exception(msg);
}
它需要的时间是它需要"理解"某些事情不正常的时间（自然，这可能是SMTP失败的不同原因）。
在您的具体代码中，我看到您正在 - 提出一个异常，根据您的要求不是您想要的，因此可能更好的解决方案可能是：
catch (SmtpException ex)
{
string msg = "Mail cannot be sent:";
msg += ex.Message;
log.Debug("Error: Inside catch block of Mail sending");
log.Error("Error msg:" + ex);
log.Error("Stack trace:" + ex.StackTrace);
SendAsyncMessage(msg);//just an example
}
对于客户端通知，您可以使用任何您想要的内容。有不同的库：
- 约翰爸爸的祝酒词
- 引导程序3 警报
等等...
如果这不是您要要求的，请澄清。