log4net 使用

下载log4net.dll程序添加引用

官方网站：http://logging.apache.org/log4net/

官方给出的示例：http://logging.apache.org/log4net/release/config-examples.html

以下是log4net.cofig xml配置文件信息和调试程序：

log4net记录日志到SqlServer

<bufferSize value="100" /> 当缓存达到100kb时候存入数据库

<!--数据库中创建日志表
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
)
-->
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
    <bufferSize value="100" />
    <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    <connectionString value="data source=[database server];initial catalog=[database name];integrated security=false;persist security info=True;User ID=[user];Password=[password]" />
    <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>
     <root>
      <!--启用数据库记录日志-->
      <appender-ref ref="AdoNetAppender_SQLServer" />
    </root>
  </log4net>
</configuration>

log4net记录日志到文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <!--定义输出到文件中-->
    <appender name="LogFileAppender" type="log4net.Appender.FileAppender">
      <!--定义文件存放位置-->
      <file value="LogFileAppender_log.txt" />
      <appendToFile value="true" />
      <datePattern value="yyyyMMdd-HH:mm:ss" />
      <layout type="log4net.Layout.PatternLayout">
        <!--输出格式-->
        <!--样例：2010-11-17 15:50:23,443 [9] (D:/CSProjects/Log4NetDemo/Log4NetDemo/Program.cs:27) FATAL Log4NetDemo.Program [(null)] - fatal System.Exception: 在发生了一个致命错误，Exception Id：548828745-->
        <conversionPattern value="记录时间：%date 线程ID:[%thread] 日志级别：文件：所在行%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message%newline" />
      </layout>
    </appender>
    <root>
      <!--记录日志到文件-->
      <appender-ref ref="LogFileAppender" />
    </root>
  </log4net>
</configuration>

log4net 使用Rolling方式记录日志按照日期记录到文件(运行两次程序可看出效果)

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <appender name="RollingLogFileAppender_DateFormat" type="log4net.Appender.RollingFileAppender">
      <file value="RollingLogFileAppender_DateFormat_log.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <!--<datePattern value="yyyyMMdd-HHmm" />-->
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread](%file:%line) %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <root>
      <!--使用Rolling方式记录日志按照日期-->
      <appender-ref ref="RollingLogFileAppender_DateFormat" />
    </root>
  </log4net>
</configuration>

log4net 使用Rolling方式记录日志
每个日志文件最大100KB，生成的日志文件名会是log.txt.1,log.txt.2 ...log.txt.10
如果记录的日志超过10个，会从log.txt.1开始覆盖

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="RollingFileAppender_log.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="100KB" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] (%file:%line) %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <root>
      <!--使用Rolling方式记录日志开始覆盖-->
      <appender-ref ref=RollingFileAppender />
    </root>
  </log4net>
</configuration>

log4net 定义输出到控制台命令行中

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] (%file:%line) %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <root>
      <!-- 定义输出到控制台命令行中-->
      <appender-ref ref="ConsoleAppender" />
    </root>
  </log4net>
</configuration>

测试程序如下:

using log4net;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

//此处注意添加以下
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Random random = new Random();
            for (int i = 0; i < 1000; i++)
            {
                //创建日志记录组件实例
                //ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);  

                ILog log=log4net.LogManager.GetLogger(typeof(Program));
                //记录错误日志
                log.Error("error", new Exception("在这里发生了一个异常,Error Number:"+random.Next()));
                //记录严重错误
                log.Fatal("fatal", new Exception("在发生了一个致命错误，Exception Id："+random.Next()));
                //记录一般信息
                log.Info("提示：系统正在运行");
                //记录调试信息
                log.Debug("调试信息：debug");
                //记录警告信息
                log.Warn("警告：warn");
            }
            //Console.WriteLine("日志记录完毕。");
            Console.Read();
        }
    }
}

以下附测试程序：测试程序