This article describes the easy way to be followed for using File Appender of Log4net to write to a text file in a web application day by day.
First of all, get the latest version of log4net library and add reference of it in your project. You can download here : http://logging.apache.org/log4net/download_log4net.cgi.
Add below line in your AssemblyInfo.cs file.
[assembly: log4net.Config.XmlConfigurator(ConfigFile="Web.config", Watch=true)]
 |
| Folder where you put log4net |
Add below section in Web.Config file.
<configuration>
<configSections>
<!-- log4net START here-->
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
<!-- log4net STOP here-->
</configSections>
<!-- log4net START here-->
<log4net>
<root>
<level value="ALL"/>
<appender-ref ref="MyTxt"/>
</root>
<appender name="MyTxt" type="log4net.Appender.RollingFileAppender">
<file value="G:\Log_"/>
<!-- This is file path to save the log. Note : don't put file extension.-->
<appendToFile value="true"/>
<datePattern value="yyyy-MM-dd.\tx\t"/>
<!-- This is date format for file name to save the log.-->
<rollingStyle value="Date"/>
<param name="StaticLogFileName" value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%d [%-5thread] %-5level : %logger : %message %timestampms %n"/>
</layout>
</appender>
</log4net>
<!-- log4net END here-->
<appSettings>
<add key="logging" value="Y"/>
<!-- Here is boolean flag to log or not-->
</appSettings>
//Other sections may go here
</configuration>
Add one class Logging.cs file.
public class Logging
{
public Logging()
{
//
// TODO: Add constructor logic here
//
}
public static void logMsg(string msg, ref log4net.ILog log)
{
if (ConfigurationManager.AppSettings["logging"].ToString().Equals("Y"))
{
//There are seven logging levels.
log.Error("MyApp : " + msg);
//log.Fatal("MyApp : " + msg);
//log.Warn("MyApp : " + msg);
//log.Info("MyApp : " + msg);
//log.Debug("MyApp : " + msg);
}
}
}
In your code-behind,
//declare private static variable.
private static log4net.ILog log4 = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
protected void Page_Load(object sender, EventArgs e)
{
try
{
String Qs = Request.QueryString["id"].ToString();
//here cause error when it miss id querystring.
}
catch (Exception ex)
{
Logging.logMsg(ex.Message, ref log4);
}
}
when it lead to error every times, it save the error in log file(here may be Log_2011-12-22.txt) and log statement may be similar as below :
2011-12-22 16:37:47,034 [4688 ] ERROR : WebAppBlog._Default : MyApp : Object reference not set to an instance of an object. 534ms
That's it. Thank for reading.
