How to Use log4net)

Introduction
Log4net is an open-source component that enables. net programs to record logs and output them in various formats.

Use Code
Log4net provides a simple way to use powerful log functions. The steps are as follows:

1. obtain the latest log4net component and add the reference to the program.
One Version Download: http://files.cnblogs.com/xugang/log4net.rar

2. Add the following lines to your assemblyinfo. CS file.

[Assembly: log4net. config. xmlconfigurator (configfile = "Web. config", watch = true)] // For log4net 1.2.10.0

The preceding statement provides a configuration file for configuring log4net parameters.

3. Add the following nodes to Web. config.

<Configsections>
<Section name = "log4net" type = "log4net. config. log4netconfigurationsectionhandler, log4net"/>
</Configsections>
<Log4net DEBUG = "true">
<Appender name = "rollinglogfileappender" type = "log4net. appender. rollingfileappender">
<File value = "C :\\ testproj \ testlog.txt"/>
<Appendtofile value = "true"/>
<Rollingstyle value = "size"/>
<Maxsizerollbackups value = "10"/>
<Maximumfilesize value = "10 MB"/>
<Staticlogfilename value = "true"/>
<Layout type = "log4net. layout. patternlayout">
<Conversionpattern value = "%-5 p % d % 5rms %-22.22c {1} %-18.18 M-% m % N"/>
</Layout>
</Appender>
<Root>
<Level value = "debug"/>
<Appender-ref = "rollinglogfileappender"/>
</Root>
</Log4net>

The above node defines the configuration record Log Parameters

Rollinglogfileappender describes how to record logs. This means that logs will be written in a file and will be automatically added when the file is full.
There are other available ways to save logs.

Layout is responsible for formatting log requests. However, the definition of the log storage path is related to the log output format.
The preceding layout output format is as follows:

20:26:04, 033 [1736] Error utility [paystub]-cocould not find a part of the path
"C: \ Inetpub \ wwwroot \ testproj \ template \ paystub. xml"

4. If you want to add your diagnosis information to log4net, you must add the following code to the Web. config file: <etettings>
<Add key = "log4net. Internal. debug" value = "true"/>
</Appsettings>

Run the following code on the system. Web node:

<System. Diagnostics>
<Trace autoflush = "true">
<Listeners>
<Add name = "textwritertracelistener"
Type = "system. Diagnostics. textwritertracelistener"
Initializedata = "C :\\ testproj \ testprojlog4net.txt"/>
</Listeners>
</Trace>
</System. Diagnostics>

5. perform the following steps on the code page:

A. Add a namespace

Using log4net;

B. Add the class definition declaration Private Static readonly ilog = logmanager. getlogger (typeof (testpage1). Name );

Or Private Static readonly ilog log = logmanager. getlogger (system. reflection. methodbase. getcurrentmethod (). declaringtype );

6. Now you can use the following statement to record the log if (log. iserrorenabled)
{
Log. Error ("Page load failed:" + ex. Message );
}

Or if (log. isdebugenabled)
{
Log. debug ("application loaded successfully .");
}

Here is a brief introduction to the use of log4net, but log4net still has many features available.

Source: http://blog.csdn.net/jecray/archive/2007/04/06/1554673.aspx

Related Articles:
Log4net User Guide
Log4net