ASP. NET use log4net log component tutorial (one log is generated every day and the log is cut by size)

Logs are a required tool for a large website or system. You can use logs to clearly understand the running status of the program and get feedback in a timely manner to solve the problem. asp is introduced below. the log4net log component of the Net version is a very powerful tool, the latest version. net2.0 1.2.10.0
After a day, I finally learned how to use it. I just recorded it.
The following describes how to use a separate configuration file for log4net.
Start action:
Step 1: reference the log4net. dll file in the project
Step 2:
Add the following code to the Web. config file:

<configuration>    <configSections>      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />    </configSections></configuration>

Step 3:
Create a separate configuration file named log4net. config
(This configuration file will generate a log file every day under the app_data directory, for example, logs_20090703.txt)

<log4net>
<!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL -->
<!-- Set root logger level to ERROR and its appenders -->
<root>
<level value="ALL"/>
<appender-ref ref="SysAppender"/>
</root>

<!-- Print only messages of level DEBUG or above in the packages -->
<logger name="WebLogger">
<level value="DEBUG"/>
</logger>

<appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="App_Data/" />
<param name="AppendToFile" value="true" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" />
<param name="StaticLogFileName" value="false" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
<param name="Header" value="&#13;&#10;----------------------header--------------------------&#13;&#10;" />
<param name="Footer" value="&#13;&#10;----------------------footer--------------------------&#13;&#10;" />
</layout>
</appender>
<appender name="consoleApp" type="log4net.Appender.ConsoleAppender,log4net">
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
</layout>
</appender>
</log4net>

Step 4: (this step is critical)
Add a code to the assemblyinfo. CS file. The path of assemblyinfo. CS is located in the properties directory.
The added code is as follows:
// Log component configuration

[assembly: log4net.Config.DOMConfigurator(ConfigFile = "log4net.config", Watch = true)]

Step 5: start using the. CS code of log4net
First introduce:
Using log4net;
Code:
 

Object o = configurationsettings. getconfig ("log4net"); log4net. config. domconfigurator. configure (O as system. XML. xmlelement); log4net. ilog logger = log4net. logmanager. getlogger ("weblogger"); logger. debug ("debug"); logger. error ("this is an error log"); logger. fatal ("this is a fatal error log"); logger. warn ("this is a warning log"); logger. info ("this is a normal message ");

This is simple.
The following describes how to automatically cut multiple files by size in a configuration file.
The separate configuration file (by size) of log4net. config is as follows:
 

<Log4net>
<! -- Off, fatal, error, warn, info, debug, all -->
<! -- Set root logger level to Error and Its appenders -->
<Root>
<Level value = "all"/>
<Appender-ref = "sysappender"/>
</Root>

<! -- Print only messages of level debug or abve in the packages -->
<Logger name = "weblogger">
<Level value = "debug"/>
</Logger>

<Appender name = "sysappender" type = "log4net. appender. rollingfileappender">
<Param name = "file" value = "app_data \ logs.txt"/>
<Param name = "appendtofile" value = "true"/>
<Param name = "maxsizerollbackups" value = "12"/> <! -- Cut the maximum number of files -->
<Param name = "maximumfilesize" value = "500kb"/> <! -- Size of each file -->
<Param name = "rollingstyle" value = "size"/>
<Param name = "staticlogfilename" value = "true"/>
<Layout type = "log4net. layout. patternlayout">
<Param name = "conversionpattern" value = "% d [% T] %-5 p % C [% x]-% m % N"/>
</Layout>
</Appender>
</Log4net>

Next, let's take a look at what I used on my server: