如何在ASP.NET应用程序中记录错误(例外)？

try
{
    // 可能出现异常的代码
}
catch (Exception ex)
{
    // 记录错误信息
    LogError(ex);
}

protected void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();
    // 记录错误信息
    LogError(ex);
}

<elmah>
 <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/App_Data/Elmah" />
 <errorMail from="your-email@example.com" to="admin-email@example.com" subject="Error in ASP.NET Application" async="true" />
 <security allowRemoteAccess="yes" />
</elmah>

using Elmah;

try
{
    // 可能出现异常的代码
}
catch (Exception ex)
{
    // 记录错误信息
    ErrorSignal.FromCurrentContext().Raise(ex);
}

<log4net>
  <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="App_Data/Logs/log.txt" />
   <appendToFile value="true" />
   <rollingStyle value="Size" />
    <maxSizeRollBackups value="10" />
   <maximumFileSize value="10MB" />
   <staticLogFileName value="true" />
   <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
    </layout>
  </appender>
  <root>
   <level value="ERROR" />
    <appender-ref ref="RollingFileAppender" />
  </root>
</log4net>

protected void Application_Start(object sender, EventArgs e)
{
    log4net.Config.XmlConfigurator.Configure();
}

using log4net;

ILog log = LogManager.GetLogger(typeof(Global));

try
{
    // 可能出现异常的代码
}
catch (Exception ex)
{
    // 记录错误信息
    log.Error("An error occurred", ex);
}