在log4net中使用smtpAppender的多个smtphost地址

Question

我希望能够指定多个smtp服务器主机地址并实现一个逻辑,如果使用一个smtp服务器的电子邮件失败,它会尝试使用下一个smtp服务器地址发送.是否可以使用log4net.我们可以覆盖log4net的一些功能并在其中实现我们自己的逻辑来发送电子邮件吗？

<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
  <to value="group@ivp.in" />
  <from value="uname@ivp.in" />
  <subject>Error Notification</subject>
  **<smtpHost value="10.0.0.12, 10.0.0.13" />**
  <authentication value="None" />
  <port value="25" />
  <bufferSize value="1" />
  <EnableSsl value="false"/>
  <lossy value="true" />
  <evaluator type="log4net.Core.LevelEvaluator">
    <threshold value="ERROR"/>
  </evaluator>
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%newline%date [%thread] %level %logger - %message%newline%newline%exception" />
  </layout>
</appender>

Answer 1

有一种更简单的方法

<to value="group@ivp.in,group2@ivp.in,group3@ivp.in,group4@ivp.in" />

Answer 2

只有在您实施时才有可能custom SmtpAppender.

我CustomSmtpAppender从Log4net源代码示例中复制了代码.希望这会对你有所帮助.

不要忘记CustomSmtpAppender在你的应用程序配置中引用

using System;
using System.IO;
using System.Web.Mail;

using log4net.Layout;
using log4net.Core;
using log4net.Appender;

namespace SampleAppendersApp.Appender
{
    /// <summary>
    /// Simple mail appender that sends individual messages
    /// </summary>
    /// <remarks>
    /// This SimpleSmtpAppender sends each LoggingEvent received as a
    /// separate mail message.
    /// The mail subject line can be specified using a pattern layout.
    /// </remarks>
    public class SimpleSmtpAppender : AppenderSkeleton
    {
        public SimpleSmtpAppender()
        {   
        }

        public string To 
        {
            get { return m_to; }
            set { m_to = value; }
        }

        public string From 
        {
            get { return m_from; }
            set { m_from = value; }
        }

        public PatternLayout Subject 
        {
            get { return m_subjectLayout; }
            set { m_subjectLayout = value; }
        }

        public string SmtpHost
        {
            get { return m_smtpHost; }
            set { m_smtpHost = value; }
        }

        #region Override implementation of AppenderSkeleton

        override protected void Append(LoggingEvent loggingEvent) 
        {
            try 
            {     
                StringWriter writer = new StringWriter(System.Globalization.CultureInfo.InvariantCulture);

                string t = Layout.Header;
                if (t != null)
                {
                    writer.Write(t);
                }

                // Render the event and append the text to the buffer
                RenderLoggingEvent(writer, loggingEvent);

                t = Layout.Footer;
                if (t != null)
                {
                    writer.Write(t);
                }

                MailMessage mailMessage = new MailMessage();
                mailMessage.Body = writer.ToString();
                mailMessage.From = m_from;
                mailMessage.To = m_to;

                if (m_subjectLayout == null)
                {
                    mailMessage.Subject = "Missing Subject Layout";
                }
                else
                {
                    StringWriter subjectWriter = new StringWriter(System.Globalization.CultureInfo.InvariantCulture);
                    m_subjectLayout.Format(subjectWriter, loggingEvent);
                    mailMessage.Subject = subjectWriter.ToString();
                }

                if (m_smtpHost != null && m_smtpHost.Length > 0)
                {
                    SmtpMail.SmtpServer = m_smtpHost;
                }

                SmtpMail.Send(mailMessage);
            } 
            catch(Exception e) 
            {
                ErrorHandler.Error("Error occurred while sending e-mail notification.", e);
            }       
        }

        override protected bool RequiresLayout
        {
            get { return true; }
        }

        #endregion // Override implementation of AppenderSkeleton

        private string m_to;
        private string m_from;
        private PatternLayout m_subjectLayout;
        private string m_smtpHost;
    }
}