1.下载log4net （Google log4net） //已有
2.unzip log4net
3.运行VS,新建 c# Windows应用程序。
4.添加引用Log4NET
5.新建一个应用程序配置文件App.config（具体内容附在后面）
6.打开Form1.cs，
在Namespace上添加一行 [assembly: log4net.Config.DOMConfigurator(Watch=true)]
（或者 编辑Assembly.cs文件,添加如下内容:
[assembly:log4net.Config.DOMConfigurator( ConfigFileExtension="config",Watch=true)] ）
也可以在properties下面的AssemblyInfo.cs下添加
[assembly:log4net.Config.XOMConfigurator( ConfigFileExtension="config",Watch=true)] ）
在类Form1中添加一个静态变量
private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
7.添加一个按钮。在按钮处理函数中添加一行 log.Warn("你好！");
8.运行程序。点一下按钮。
OK,打开Bin\Debug\log-file.txt，可以看到“你好”。
附.App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<!-- Register a section handler for the log4net section -->
<configSections>
<section name="log4net" type="System.Configuration.IgnoreSectionHandler" />
</configSections>
<appSettings>
<!-- To enable internal log4net logging specify the following appSettings key -->
<!-- <add key="log4net.Internal.Debug" value="true"/> -->
</appSettings>
<!-- This section contains the log4net configuration settings -->
<log4net>
<!-- Define some output appenders -->
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="log-file.txt" />
<!-- Example using environment variables in params -->
<!-- <param name="File" value="${TMP}\\log-file.txt" /> -->
<param name="AppendToFile" value="true" />
<!-- An alternate output encoding can be specified -->
<!-- <param name="Encoding" value="unicodeFFFE" /> -->
<layout type="log4net.Layout.PatternLayout">
<param name="Header" value="[Header]\r\n" />
<param name="Footer" value="[Footer]\r\n" />
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] <%X{auth}> - %m%n" />
</layout>
<!-- Alternate layout using XML
<layout type="log4net.Layout.XMLLayout" /> -->
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="LogFileAppender" />
<!-- <appender-ref ref="A" /> -->
</root>
<!-- Specify the level for some specific categories -->
<logger name="SLog4net.Form1">
<!-- <appender-ref ref="B" /> -->
<level value="ALL" />
<appender-ref ref="RollingLogFileAppender" />
</logger>
</log4net>
</configuration>
--------------------------------App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<!-- Register a section handler for the log4net section -->
<configSections>
<section name="log4net" type="System.Configuration.IgnoreSectionHandler" />
</configSections>
<appSettings>
<!-- To enable internal log4net logging specify the following appSettings key -->
<!-- <add key="log4net.Internal.Debug" value="true"/> -->
</appSettings>
<!-- This section contains the log4net configuration settings -->
<log4net>
<!-- Define some output appenders -->
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="log-file.txt" />
<!-- Example using environment variables in params -->
<!-- <param name="File" value="${TMP}\\log-file.txt" /> -->
<param name="AppendToFile" value="true" />
<!-- An alternate output encoding can be specified -->
<!-- <param name="Encoding" value="unicodeFFFE" /> -->
<layout type="log4net.Layout.PatternLayout">
<param name="Header" value="[Header]\r\n" />
<param name="Footer" value="[Footer]\r\n" />
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] <%X{auth}> - %m%n" />
</layout>
<!-- Alternate layout using XML
<layout type="log4net.Layout.XMLLayout" /> -->
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="LogFileAppender" />
<!-- <appender-ref ref="A" /> -->
</root>
<!-- Specify the level for some specific categories -->
<logger name="SLog4net.Form1">
<!-- <appender-ref ref="B" /> -->
<level value="ALL" />
<appender-ref ref="RollingLogFileAppender" />
</logger>
</log4net>
</configuration>
//调用------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using log4net;
[assembly: log4net.Config.DOMConfigurator(Watch = true)]
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
private void button1_Click(object sender, EventArgs e)
{
log.Warn("你好！");
}
}