Some basic usages of Log4

1. First, configure the inside of the Webconfig

<configuration>   <configSections>     <section name= "log4net" type= "log4net. Config.log4netconfigurationsectionhandler,log4net "/>   </configSections>   <log4net>     <root>       <priority value= "All"/>        <appender-ref ref= "Traceappender"/>       <appender-ref ref= " Consoleappender "/>       <appender-ref ref=" Rollinglogfileappender "/>      </root>     <appender name= "Traceappender" type= "log4net. Appender.traceappender ">       <layout type=" log4net. Layout.patternlayout ">         <conversionpattern value="%date [%thread]% -5level%logger [%PROPERTY{NDC}]-%message%newline "/>       </layout>      </appender>   &nbsp <appender name= "Consoleappender" type= "log4net". Appender.consoleappender ">       <layout type=" log4net. Layout.patternlayout ">         <conversionpattern value="%date [%thread]% -5level%logger [%PROPERTY{NDC}]-%message%newline "/>       </layout>      </appender>     <appender name= "Rollinglogfileappender" type= "log4net. Appender.rollingfileappender ">       <file value=" log/log/"/>        <appendtofile value= "true"/>       <rollingstyle value= "Date"/> & nbsp;     <datepattern value= ". YyyyMMdd '. html '"/>       < Staticlogfilename value= "false"/>       <layout type= "Log4net". Layout.patternlayout ">         <conversionpattErn value= "%d [%t]%-5p%c-%m%n"/>       </layout>     </appender& Gt   </log4net>

2. Then build a Loghelper class

Using System; Using System.Data; Using System.Configuration; Using System.Web; Using System.Web.Security; Using System.Web.UI; Using System.Web.UI.WebControls; Using System.Web.UI.WebControls.WebParts; Using System.Web.UI.HtmlControls; Using System.IO; Using Log4net;         <summary>///loghelp Summary description///</summary> public class Loghelp {public Loghelp () {// TODO: Add constructor logic//} here

Private Const string log_repository = "Default";     This should likely is set in the Web Config.               private static ILog M_log; public static void Init () {log4net.     Config.XmlConfigurator.Configure (); }

private static void Dolog (String message, Logmessagetype MessageType, Exception ex, type type) {M_log = Logm Anager. GetLogger (type);

Switch (messagetype) {case LogMessageType.Debug:LogHelp.m_log.                 DEBUG (message, ex); Break

Case LogMessageType.Info:LogHelp.m_log.                 Info (message, ex); Break

Case LogMessageType.Warn:LogHelp.m_log.                 Warn (message, ex); Break

Case LogMessageType.Error:LogHelp.m_log.                 ERROR (message, ex); Break

            Case Logmessagetype.fatal:                  Loghelp.m_log. Fatal (message, ex);                 break;        }    }    /* Log level/    Public enum Logmessagetype     {       ///<summary>  & nbsp;     ///Debugging        ///</summary>          Debug,        ///<summary>         ///Information        ///</summary>          Info,        ///<summary>        ///warning        ///</summary>          Warn        ///<summary>         ///error        ///</summary>          Error,        ///<summary>         ///fatal error        ///</summary>          Fatal    }

public static void Write (String message, Logmessagetype messagetype) {dolog (message, MessageType, NULL     , Type.GetType ("System.Object")); }

public static void Write (String message, Logmessagetype MessageType, type type) {dolog (message, MessageType,     null, type); }

public static void Write (String message, Logmessagetype MessageType, Exception ex) {dolog (message, Messagetyp     E, ex, Type.GetType ("System.Object")); }

public static void Write (String message, Logmessagetype MessageType, Exception ex, type type) {Dolog     (Message, MessageType, ex, type); }

public static void Assert (bool condition, string message) {ASSERT (condition, message, Type.GetType ("System.ob     Ject ")); }

public static void Assert (bool condition, string message, type type) {if (condition = false) Wri     TE (message, logmessagetype.info); } 3 finally written in global

<%@ application Language= "C #"%> <%@ Import namespace= system.diagnostics "%>" <script runat= "Server" >

void Application_Start (object sender, EventArgs e) {loghelp.init (); Loghelp.write ("Site program runs ...<br>", LogHelp.LogMessageType.Info, this.)     GetType ()); } void Application_End (object sender, EventArgs e) {} void Application_Error (Object sen Der, EventArgs E) {//code to run when an unhandled error occurs Exception err = Server.GetLastError ();

        if (err is Exception)         {            //stringbuilder sb = new StringBuilder ();

           //if (request.islocal)             //    sb. Appendline (Err. Message.tostring ());            //else             //    sb. Appendline (String. Format ("The System program has an exception. &LT;BR/> Error message: {0} ", err));            //server.clearerror ();            //apperror.writeerror ( AppError.ErrorType.Error, sb. ToString ());                          try             {                 loghelp.write ("Exception:", LoghelP.logmessagetype.error, err, this. GetType ());            }              catch             {                //Log Write Failed ...            }                                    }          }

    void Session_Start (object sender, EventArgs e)     {        //code to run at the start of a new session        //application.lock ();        //application["Count" = Convert.ToInt32 (application["Count"]) + 1;        //sqlparameter[] param ={new SqlParameter ("@counter", application["Count "]. ToString ())};        //string procname = "dbo." Updatecounter ";        //database.executequery (Procname,param);        //application.unlock ();    }

void Session_End (object sender, EventArgs e) {//code that runs at the end of the session. Note: The Session_End event is raised only if the sessionstate mode in the Web.config file is set to//InProc. If the session mode is set to StateServer//or SQL Server, the event is not raised.

} </script>