C# 当smtp异常需要在本地服务器中显示错误消息时，请尝试使用catch块
当使用C# 当smtp异常需要在本地服务器中显示错误消息时，请尝试使用catch块,c#,asp.net,email,smtp,try-catch,C#,Asp.net,Email,Smtp,Try Catch,当使用smtp端口时出现异常时使用Catch块，但它会抛出异常，这很好，它将花费很长时间，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，并且不应出现在代码中。每当服务器关闭或无效电子邮件Id或smtp端口发生更改时，它应引发异常，结论是错误消息不应直接出现在代码中。它应显示错误消息并停止不应挂起的应用程序 protected void Button2_Click(object sender, EventArgs e) { //string v
smtp它将花费很长时间localserver服务器无效电子邮件Idsmtp端口引发异常挂起的应用程序
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);
}
protectedvoid按钮2\u单击（对象发送者，事件参数e）
{
//串vv；
//vv=（字符串）会话[“FID”]；
DateTime sdt=DateTime.Today；
SqlCommand cmd4=新的SqlCommand（）；
int标志=0；
字符串测试=DateTime.Now.ToString（“dd.MM.yyy”）；
对于（int i=0；i它需要的时间是它需要“理解”某些事情不正常的时间（当然，smtp失败可能有不同的原因）
在您的具体代码中，我看到您重新提出了一个异常，这是根据您的需求而不是您想要的，因此可能更好的解决方案是：
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。有不同的库：
等等
如果这不是您想要的，请澄清。试试这些代码行，它会起作用的
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);
}
protectedvoid按钮2\u单击（对象发送者，事件参数e）
{
//串vv；
//vv=（字符串）会话[“FID”]；
DateTime sdt=DateTime.Today；
SqlCommand cmd4=新的SqlCommand（）；
int标志=0；
字符串测试=DateTime.Now.ToString（“dd.MM.yyy”）；
对于（int i=0；i）这看起来不错，但如果我在catch中使用MessageBox
，我想它会显示名称MessageBox
在当前内容中不存在`@SatwikMn：考虑到您的情况下SMTP执行是异步的，您必须在客户端等待响应，如果出现异常，只返回mesage（确定，失败），客户端向用户显示一条消息。因此，处理异常大约需要25-30秒。您不认为处理异常需要很长时间吗？@SatwikMn：如果SMTP花费太多时间来确定失败，可能是系统管理员问题，而不是代码问题。但如果用户在某种方式。如果我使用Response.Writeline（msg）；
而不是SendAsyncMessage（msg）；