使用Log4net进行日志管理

从http://logging.apache.org/log4net/downloads.html下载log4net的最新版本

在<configuration></configuration>之间加上以下两段：
<configSections>
<section name="log4net" type="System.Configuration.IgnoreSectionHandler" />
</configSections>

表示日志写到sql server数据库里，在http://logging.apache.org/log4net/release/config-examples.html有各种输出的配置，包括文件、windows日志，各种数据库等配置文件作为参考。以下为数据库的配置：

<!--</system.web>-->

<log4net>

<root>
<level value="all" />
<appender-ref ref="AdoNetAppender" />
</root>

<!--
<logger name="testapp.logging">
<level value="all"/>
<appender-ref ref="adonetappender" />

</logger>
-->

<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
<bufferSize value="2" />
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

<connectionString value="data source=.;initial catalog=Mail;integrated security=false;persist security info=True;User ID=sa;Password=web678sql" />

<commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
<parameter>
<parameterName value="@log_date" />
<dbType value="DateTime" />
<layout type="log4net.Layout.RawTimeStampLayout" />
</parameter>
<parameter>
<parameterName value="@thread" />
<dbType value="String" />
<size value="255" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%thread" />
</layout>
</parameter>
<parameter>
<parameterName value="@log_level" />
<dbType value="String" />
<size value="50" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%level" />
</layout>
</parameter>
<parameter>
<parameterName value="@logger" />
<dbType value="String" />
<size value="255" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%logger" />
</layout>
</parameter>
<parameter>
<parameterName value="@message" />
<dbType value="String" />
<size value="4000" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
<parameter>
<parameterName value="@exception" />
<dbType value="String" />
<size value="2000" />
<layout type="log4net.Layout.ExceptionLayout" />
</parameter>
</appender>
</log4net>

<!--</configuration>-->

在AssemblyInfo.cs 上添加[assembly: log4net.Config.XmlConfiguratorAttribute(Watch=true)]

Global文件中添加
protected void Application_Start(Object sender, EventArgs e)
{
log4net.Config.XmlConfigurator.Configure();
}

你可以自己封装log类
如：
using System;
using log4net;

namespace LogTest.Common
{
/// <summary>
/// MyLog 的摘要说明。
/// </summary>
public class MyLog
{
private MyLog()
{
//
// TODO: 在此处添加构造函数逻辑
//
}

private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(MyLog));
public static void loginfo()
{
log.Info("log日志");
}

public static void logerror()
{
log.Info("log错误");
}
}
}
在程序中直接调用MyLog.loginfo();就ok了

数据库服务器上创建数据库表，名称与app.config中appender中的一致：

CREATE TABLE [dbo].[LOG] (
[Id] [int] IDENTITY (1, 1) NOT NULL,
[Date] [datetime] NOT NULL,
[Thread] [varchar] (255) NOT NULL,
[Level] [varchar] (50) NOT NULL,
[Logger] [varchar] (255) NOT NULL,
[Message] [varchar] (4000) NOT NULL,
[Exception] [varchar] (2000) NULL
)