如何解決smtpException被用戶代碼未處理

Question

public partial class ForgotPassword : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void btnPass_Click(object sender, EventArgs e) 
    { 
     //Create Connection String And SQL Statement 
     string strConnection = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; 
     string strSelect = "SELECT UserName,Password FROM Users WHERE Email = @Email"; 

     SqlConnection connection = new SqlConnection(strConnection); 
     SqlCommand command = new SqlCommand(); 
     command.Connection = connection; 
     command.CommandType = CommandType.Text; 
     command.CommandText = strSelect; 

     SqlParameter email = new SqlParameter("@Email", SqlDbType.VarChar, 50); 
     email.Value = txtEmail.Text.Trim().ToString(); 
     command.Parameters.Add(email); 

     //Create Dataset to store results and DataAdapter to fill Dataset 
     DataSet dsPwd = new DataSet(); 
     SqlDataAdapter dAdapter = new SqlDataAdapter(command); 
     connection.Open(); 
     dAdapter.Fill(dsPwd); 
     connection.Close(); 
     if(dsPwd.Tables[0].Rows.Count > 0) 
     { 

      MailMessage loginInfo = new MailMessage(); 
      loginInfo.To.Add(txtEmail.Text.ToString()); 
      loginInfo.From = new MailAddress("YourID@gmail.com"); 
      loginInfo.Subject = "Forgot Password Information"; 

      loginInfo.Body = "Username: " + dsPwd.Tables[0].Rows[0]["UserName"] + "<br /><br />Password: " + dsPwd.Tables[0].Rows[0]["Password"] + "<br /><br />"; 
      loginInfo.IsBodyHtml = true; 
      SmtpClient smtp = new SmtpClient(); 
      smtp.Host = "smtp.gmail.com"; 
      smtp.Port = 587; 
      smtp.EnableSsl = true; 
      smtp.Credentials = new System.Net.NetworkCredential("YourGmailID@gmail.com", "YourGmailPassword"); 
      smtp.Send(loginInfo); 
      lblMessage.Text = "Password is sent to you email id,you can now <a href='Login.aspx'>Login</a>"; 
     } 
     else 
     { 
      lblMessage.Text = "Email Address Not Registered"; 
     } 

    } 
} 

我遇到了錯誤smtpException是由用戶代碼未處理...如何解決它？

Answer 1

很簡單，寫一些處理它的用戶代碼！

如果您不熟悉在try..catch塊，我建議你做一些閱讀它們，並使用它們（如適用）來處理特殊的情況下（即郵件服務器離線，網絡連接問題，密碼過期）。

的代碼導致您的例外是最有可能這條線，這應該給你的地方開始：

smtp.Send(loginInfo); 

Answer 2

您應該處理用戶代碼中的異常：

try 
{ 
    smtp.Send(loginInfo); 
} 
catch (Exception ex) 
{ 
    //Handle your exception here 
    lblMessage.Text = "Oeps, something when wrong when we tried to send the email"; 
    return; 
} 

Answer 3

的問題是你的使用錯誤的端口號。適用於SSL的Gmail。從documentation：

Outgoing Mail (SMTP) Server - requires TLS3 or SSL: smtp.gmail.com (use authentication) 
Use Authentication: Yes 
Port for TLS/STARTTLS: 587 
Port for SSL: 465 

正如你所EnableSsl選項設置爲true，你的端口號應設置爲465。

Answer 4

錯誤：郵件不能發送 - SMTP的例外是由用戶代碼

if (ModelState.IsValid) 
     { 
      try{ 
      string from = "abcd@gmail.com"; 
      using (MailMessage mail = new MailMessage(from, obj.Idemail)) 
      { 
       mail.Subject = "Admin"; 
       mail.Body = "Registration successful!"; 
       mail.IsBodyHtml = false; 
       SmtpClient smtp = new SmtpClient(); 
       smtp.Host = "smtp.gmail.com"; 
       smtp.EnableSsl = true; 
       NetworkCredential networkCredential = new NetworkCredential(from, "pswd"); 
       smtp.UseDefaultCredentials = true; 
       smtp.Credentials = networkCredential; 
       smtp.Port = 587; 
       smtp.Host = "localhost"; 
       smtp.Send(mail); 
       ViewBag.Message = "Password Sent through mail. Please chack password in your account and signup."; 
      } 
      } 
      catch (Exception ex) 
      { 
       ViewBag.Message = "Error occur for sending data"; 
      } 
     } 

     else 
     { 
      return Json("Invalid Information!", JsonRequestBehavior.AllowGet); 
     }