ChangePassword.OnSendMailError(SendMailErrorEventArgs) 方法

參考

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

當電子郵件訊息無法傳送給使用者時，引發 SendMailError 事件。

protected:
 virtual void OnSendMailError(System::Web::UI::WebControls::SendMailErrorEventArgs ^ e);

protected virtual void OnSendMailError (System.Web.UI.WebControls.SendMailErrorEventArgs e);

abstract member OnSendMailError : System.Web.UI.WebControls.SendMailErrorEventArgs -> unit
override this.OnSendMailError : System.Web.UI.WebControls.SendMailErrorEventArgs -> unit

Protected Overridable Sub OnSendMailError (e As SendMailErrorEventArgs)

參數

e: SendMailErrorEventArgs

包含事件資料的 SendMailErrorEventArgs 物件。

範例

下列程式碼範例示範使用 ChangePassword Web 控制項的 ASP.NET 網頁，並包含名為 SendingMail 之 SendingMail 事件的事件處理常式。程式碼範例假設 ASP.NET 網站已設定為使用 ASP.NET 成員資格和表單驗證，而且已建立使用者的名稱和密碼已知。如需詳細資訊，請參閱如何：實作簡單表單驗證。

如果密碼變更成功，程式碼會嘗試使用 SMTP 將電子郵件訊息傳送給使用者，以確認變更。這會在 SendingMail 事件處理常式中完成。如需如何設定 SMTP 伺服器的資訊，請參閱如何：在 IIS 6.0 中安裝和設定 SMTP 虛擬伺服器。針對此範例的目的，您不需要設定 SMTP 伺服器;此範例是建構來測試傳送電子郵件訊息失敗。

如果未正確設定郵件伺服器，或發生其他錯誤，而且無法傳送電子郵件訊息，則會呼叫函 SendMailError 式。系統會向使用者顯示一則訊息。此外，事件會記錄到 Windows 應用程式事件記錄檔，並假設名為 MySamplesSite 的事件來源已經存在。請參閱下列程式碼範例以建立指定的事件來源。如需建立事件來源的詳細資訊，請參閱ASP.NET Web Forms Pages 中的伺服器事件處理。物件的 Handled 屬性 SendMailErrorEventArgs 設定為 true ，表示已處理錯誤。

<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void MySendingMail(object sender, MailMessageEventArgs e)
  {
    Message1.Text = "Sent mail to you to confirm the password change.";
  }

  void MySendMailError(object sender, SendMailErrorEventArgs e)
  {
    Message1.Text = "Could not send email to confirm password change.";

    // The MySamplesSite event source has already been created by an administrator.
    System.Diagnostics.EventLog myLog = new System.Diagnostics.EventLog();
    myLog.Log = "Application";
    myLog.Source = "MySamplesSite";
    myLog.WriteEntry(
        "Sending mail via SMTP failed with the following error: " + 
        e.Exception.Message.ToString(), 
        System.Diagnostics.EventLogEntryType.Error);

    e.Handled = true;
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>ChangePassword including a SendMailError Event</title>
</head>
<body>
  <form id="form1" runat="server">
  <div style="text-align:center">

    <h1>ChangePassword</h1>
    
    <asp:LoginView ID="LoginView1" Runat="server" 
      Visible="true">
      <LoggedInTemplate>
        <asp:LoginName ID="LoginName1" Runat="server" FormatString="You are logged in as {0}." />
        <br />
      </LoggedInTemplate>
      <AnonymousTemplate>
        You are not logged in
      </AnonymousTemplate>
    </asp:LoginView><br />
    
    <asp:ChangePassword ID="ChangePassword1" Runat="server"
      BorderStyle="Solid" 
      BorderWidth="1" 
      CancelDestinationPageUrl="~/Default.aspx" 
      DisplayUserName="true"
      OnSendingMail="MySendingMail" 
      OnSendMailError="MySendMailError" 
      ContinueDestinationPageUrl="~/Default.aspx" >
      <MailDefinition 
        BodyFileName="~\MailFiles\ChangePasswordMail.htm" 
        Subject="Activity information for you">
        <EmbeddedObjects>
          <asp:EmbeddedMailObject Name="LoginGif" Path="~\MailFiles\Login.gif" />
          <asp:EmbeddedMailObject Name="PrivacyNoticeTxt" Path="~\MailFiles\PrivacyNotice.txt" />
        </EmbeddedObjects>
      </MailDefinition>
    </asp:ChangePassword><br />
  
    <asp:Label ID="Message1" Runat="server" ForeColor="Red" /><br />

    <asp:HyperLink ID="HyperLink1" Runat="server" 
      NavigateUrl="~/Default.aspx">
      Home
    </asp:HyperLink>
    
  </div>
  </form>
</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  Public Sub MySendingMail(ByVal Sender As Object, ByVal e As MailMessageEventArgs)
    Message1.Text = "Sent mail to you to confirm the password change."
  End Sub

  Public Sub MySendMailError(ByVal Sender As Object, ByVal e As SendMailErrorEventArgs)
    Message1.Text = "Could not send mail to confirm the password change."
    
    ' The MySamplesSite event source has already been created by an administrator.
    Dim myLog As System.Diagnostics.EventLog
    myLog = new System.Diagnostics.EventLog
    myLog.Log = "Application"
    myLog.Source = "MySamplesSite"
    myLog.WriteEntry("Sending mail via SMTP failed with the following error: " & e.Exception.Message.ToString(), System.Diagnostics.EventLogEntryType.Error)

    e.Handled = True
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>ChangePassword including a SendMailError Event</title>
</head>
<body>
  <form id="form1" runat="server">
  <div style="text-align:center">

    <h1>ChangePassword</h1>
    
    <asp:LoginView ID="LoginView1" Runat="server" 
      Visible="true">
      <LoggedInTemplate>
        <asp:LoginName ID="LoginName1" Runat="server" FormatString="You are logged in as {0}." />
        <br />
      </LoggedInTemplate>
      <AnonymousTemplate>
        You are not logged in
      </AnonymousTemplate>
    </asp:LoginView><br />
    
    <asp:ChangePassword ID="ChangePassword1" Runat="server"
      BorderStyle="Solid" 
      BorderWidth="1" 
      CancelDestinationPageUrl="~/Default.aspx" 
      DisplayUserName="true"
      OnSendingMail="MySendingMail" 
      OnSendMailError="MySendMailError" 
      ContinueDestinationPageUrl="~/Default.aspx" >
      <MailDefinition 
        BodyFileName="~\MailFiles\ChangePasswordMail.htm" 
        Subject="Activity information for you">
        <EmbeddedObjects>
          <asp:EmbeddedMailObject Name="LoginGif" Path="~\MailFiles\Login.gif" />
          <asp:EmbeddedMailObject Name="PrivacyNoticeTxt" Path="~\MailFiles\PrivacyNotice.txt" />
        </EmbeddedObjects>
      </MailDefinition>
    </asp:ChangePassword><br />
  
    <asp:Label ID="Message1" Runat="server" ForeColor="Red" /><br />

    <asp:HyperLink ID="HyperLink1" Runat="server" 
      NavigateUrl="~/Default.aspx">
      Home
    </asp:HyperLink>
    
  </div>
  </form>
</body>
</html>

如果您需要以程式設計方式將名為 MySamplesSite 的事件來源新增至應用程式記錄檔，請使用下列程式碼範例。此事件來源必須存在，第一個程式碼範例才能正常運作。下列程式碼範例需要系統管理員許可權。

#region Using directives

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

#endregion

namespace CreateEventSource
{
    class Program
    {
        static void Main(string[] args)
        {

            try
            {
                // Create the source, if it does not already exist.
                if (!EventLog.SourceExists("MySamplesSite"))
                {
                    EventLog.CreateEventSource("MySamplesSite", "Application");
                    Console.WriteLine("Creating Event Source");
                }

                // Create an EventLog instance and assign its source.
                EventLog myLog = new EventLog();
                myLog.Source = "MySamplesSite";

                // Write an informational entry to the event log.    
                myLog.WriteEntry("Testing writing to event log.");

                Console.WriteLine("Message written to event log.");
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception:");
                Console.WriteLine("{0}", e.ToString());
            }
        }
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Diagnostics


Namespace CreateEventSource
  Class Program
    Sub Main()

        Try
            ' Create the source, if it does not already exist.
            If Not (EventLog.SourceExists("MySamplesSite")) Then
                EventLog.CreateEventSource("MySamplesSite", "Application")
                Console.WriteLine("Creating Event Source")
            End If

            ' Create an EventLog instance and assign its source.
            Dim myLog As New EventLog
            myLog.Source = "MySamplesSite"

            ' Write an informational entry to the event log.
            myLog.WriteEntry("Testing writing to event log.")

            Console.WriteLine("Message written to event log.")
        Catch e As Exception
            Console.WriteLine("Exception:")
            Console.WriteLine(e.ToString)
        End Try

    End Sub
  End Class
End Namespace

下列範例程式碼可作為先前範例程式碼的ChangePasswordMail.htm檔案。

重要

在電子郵件中傳送使用者帳戶名稱或密碼是潛在的安全性威脅。 Email訊息通常會以純文字傳送，而且可由特殊網路「探查」應用程式讀取。若要改善安全性，請使用保護登入控制項中所述的風險降低措施。

<html>  
<head><title></title></head>  
<body>  
<form>  

  <h1>Your password for the account named &quot;<%Username%>&quot; has changed.</h1>  

  <p>  
  If you did not initiate this change, please call 1-206-555-0100.  
  </p>  

  <p>  
  <a href="http://www.contoso.com/login.aspx">  
    <img src="cid:LoginGif" alt="Log In" />  
  </a>   
  </p>  

  <p>  
  Please read our attached Privacy Notice.  
  </p>  

</form>  
</body>  
</html>

備註

OnSendMailError當 SMTP 郵件系統在使用者變更密碼之後嘗試傳送電子郵件訊息時，就會呼叫方法。

Exception檢查傳遞為 e 參數之物件的屬性， SendMailErrorEventArgs 以判斷例外狀況的實際原因。最常見的原因是Web.config檔案區段中的組態錯誤 smtp 。

您必須將傳遞為 e 參數的物件屬性設定 Handled 為， true 以表示已處理例外狀況，否則會再次擲回例外狀況。

引發事件會透過委派叫用此事件處理常式。如需詳細資訊，請參閱ASP.NET Web Forms 頁面中的伺服器事件處理。

OnSendMailError 方法也允許衍生類別處理事件，而不用附加委派。這是在衍生類別中處理事件的慣用技巧。

給繼承者的注意事項

在 OnSendMailError(SendMailErrorEventArgs) 衍生類別中覆寫方法時，請務必呼叫 OnSendMailError(SendMailErrorEventArgs) 基類的方法，讓已註冊的委派接收事件。

適用於

ChangePassword.OnSendMailError(SendMailErrorEventArgs) 方法

定義

參數

範例

備註

給繼承者的注意事項

適用於

另請參閱

意見反應

其他資源