SendMailErrorEventArgs.Handled 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

指示包含在 Exception 属性中的 SMTP 异常是否已经得到处理。

public:
 property bool Handled { bool get(); void set(bool value); };

public bool Handled { get; set; }

member this.Handled : bool with get, set

Public Property Handled As Boolean

属性值

Boolean

如果为 true，则此异常已被 SendMailErrorEventHandler 委托使用并得到处理。如果为 false，则再次引发异常，包含原来的调用堆栈和错误信息。

默认值为 false。

示例

下面的代码示例演示了一个使用 ChangePassword Web 控件的 ASP.NET 页，并包含名为 SendMailError的事件的SendMailError事件处理程序。代码示例假定 ASP.NET 网站已配置为使用成员身份和窗体身份验证 ASP.NET，并且已创建名称和密码已知的用户。有关详细信息，请参阅如何：实现简单表单身份验证。

如果密码更改成功，事件处理程序中的 SendingMail 代码会尝试向用户发送电子邮件以确认更改。必须已在服务器上配置 SMTP 才能使此代码示例正常工作。有关如何配置 SMTP 服务器的信息，请参阅如何：在 IIS 6.0 中安装和配置 SMTP 虚拟服务器。就此示例而言，无需配置 SMTP 服务器;构造示例是为了测试发送电子邮件失败。

如果邮件服务器配置不正确或发生其他错误，并且无法发送电子邮件， SendMailError 则调用函数。向用户显示一条消息。此外，将事件记录到 Windows 应用程序事件日志中，假设已存在名为 MySamplesSite 的事件源。请参阅下面的代码示例来创建指定的事件源。有关创建事件源的详细信息，请参阅 ASP.NET Web 窗体页中的服务器事件处理。对象的 Handled 属性 SendMailErrorEventArgs 设置为以 true 指示已处理错误。

<%@ 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>

如果需要以编程方式将名为 MySamplesSite 的事件源添加到应用程序日志，请使用以下代码示例。必须存在此事件源，第一个代码示例才能正常工作。以下代码示例需要管理员权限。

#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

注解

属性 Handled 指示是否已 Exception 处理。当控件或 CreateUserWizard无法发送电子邮件ChangePassword时，SMTP 邮件提供程序将引发异常。出现异常的最常见原因是计算机配置文件的 <smtp> 元素 (网络设置) 中出现配置错误。尽管在应用程序的开发和调试过程中通常会发现这样的错误，但邮件服务器在生产环境中可能会意外失败，并且必须确定是否希望整个应用程序在这种情况下发生故障。如果不是，处理事件允许应用程序继续。

如果未为 SendMailError 事件创建事件处理程序，或者创建了事件处理程序，但将属性设置为 Handledfalse，则如果发送电子邮件时出错，Web 应用程序将停止运行，ASP.NET 将显示错误消息。处理事件允许 Web 应用程序继续运行，即使发生了异常。当发送电子邮件并不重要时，这非常有用。例如，如果用户正在执行多步骤向导时发生异常，则记录错误、向用户显示信息性消息以及允许用户完成向导可能很有利。

适用于

通过

SendMailErrorEventArgs.Handled 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源