.NET技术-3.0. 日志插件 log4net

.NET技术-3.0. 日志插件 log4net

背景：框架 NetFramework3.5

1. 新建控制台程序 

2. 程序包管理器控制台中 增加 Nuget包

Install-Package log4net

3. 项目根目录中 增加名称为 log4net.config 的配置文件

　　文件属性选项目卡中设置 复制到输出目录改成“始终复制”

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>

  <log4net>
    <!-- 将日志写入到本地txt文件中 -->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志路径-->
      <param name= "File" value= "Logs"/>
      <!--是否是向文件中追加日志-->
      <param name= "AppendToFile" value= "true"/>
      <!--log保留天数-->
      <param name= "MaxSizeRollBackups" value= "10"/>
      <!--日志文件名是否是固定不变的-->
      <param name= "StaticLogFileName" value= "false"/>
      <!--日志文件名格式为:2008-08-31.log-->
      <param name= "DatePattern" value= "yyyy-MM-dd"/>
      <!--日志根据日期滚动-->
      <param name= "RollingStyle" value= "Date"/>
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%n%d 耗时%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
      </layout>
    </appender>

    <!-- 控制台前台显示日志 -->
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
      <mapping>
        <level value="ERROR" />
        <foreColor value="Red" />
      </mapping>
      <mapping>
        <level value="WARN" />
        <foreColor value="Yellow" />
      </mapping>
      <mapping>
        <level value="INFO" />
        <foreColor value="White" />
      </mapping>
      <mapping>
        <level value="DEBUG" />
        <foreColor value="Blue" />
      </mapping>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%n%d 程序运行时间:%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="Info" />
        <param name="LevelMax" value="Fatal" />
      </filter>
    </appender>

    <!-- 将日志写入到SQLServer中 -->
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="0" />
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="data source=.MSSQL2008R2;initial catalog=MeiTuan;integrated security=false;persist security info=True;User ID=sa;Password=111111" />
      <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>
      <!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->
      <level value="all" />
      <appender-ref ref="ColoredConsoleAppender"/>
      <appender-ref ref="RollingLogFileAppender"/>
      <appender-ref ref="AdoNetAppender"/>
    </root>
  </log4net>
</configuration> 

 4. 打开项目里Properties文件夹下的AssemblyInfo.cs文件。往里面追加以下内容：

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

5. 调用方式

    class Program
    {
        static void Main(string[] args)
        {
            InitLog4Net();

            var logger = LogManager.GetLogger(typeof(Program));

            logger.Info("消息");
            logger.Warn("警告");
            logger.Error("异常");
            logger.Fatal("错误");

            Console.ReadLine();
        }

        private static void InitLog4Net()
        {
            var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
            XmlConfigurator.ConfigureAndWatch(logCfg);
        }
    } 

6 在SQLServer中创建一张日志表(往对应配置文件中的连接字符串里面的数据库新增表)：(未测)

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
) 

ok，配置完成，可查看日志。

参考：https://blog.csdn.net/xc917563264/article/details/79498313