C#-log4net的使用-CFANZ编程社区

使用log4net大致分以下几步：
1.安装 log4net，通过 Nuget 下载（或者有log4net.dll的话，直接引用即可）
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2.新建 log4net.config 配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <root>
    </root>
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" type="" value="Log/Error/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd&quot;.ini&quot;" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="[%d]%n%m%n" />
      </layout>
    </appender>
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="0" />
      <connectionType value="System.Data.SQLite.SQLiteConnection,System.Data.SQLite" />
      <connectionString value="Data Source=DataBase\\Log4NetSQLite.db;Version=3;" />
      <commandText value="INSERT INTO Log (Date, Level, Logger, Message) VALUES (@Date, @Level, @Logger, @Message)" />
      <parameter>
        <parameterName value="@Date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.RawTimeStampLayout" />
      </parameter>
      <parameter>
        <parameterName value="@Level" />
        <dbType value="String" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%level" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@Logger" />
        <dbType value="String" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%logger" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@Message" />
        <dbType value="String" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%message" />
        </layout>
      </parameter>
    </appender>
    <logger name="Error">
      <level value="ERROR" />
      <appender-ref ref="InfoAppender" />
    </logger>
    <logger name="Info">
      <level value="INFO" />
      <appender-ref ref="AdoNetAppender" />
    </logger>
  </log4net>
</configuration>

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3.设置 log4net.config 属性 “复制到输出目录”，选择“始终复制”
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4.在 AssemblyInfo.cs 中添加一行代码

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

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5.写一个通用类 LogHelper

 public class LogHelper
    {
        /// <summary>
        /// 普通日志
        /// </summary>
        /// <param name="message">日志内容</param>
        public static void Info(string message)
        {
            ILog log = LogManager.GetLogger("Info");
            if (log.IsInfoEnabled)
            {
                log.Info(message);
            }           
        }
        /// <summary>
        /// 错误日志带异常
        /// </summary>
        /// <param name="message">错误日志</param>
        public static void Error(string message, Exception ex)
        {
            ILog log = LogManager.GetLogger("Error");
            if (log.IsErrorEnabled)
            {
                log.Error(message, ex);
            }
        }

        /// <summary>
        /// 错误日志不带异常
        /// </summary>
        /// <param name="message">错误日志</param>
        public static void Error(string message)
        {
            ILog log = LogManager.GetLogger("Error");
            if (log.IsErrorEnabled)
            {
                log.Error(message);
            }
        }
    }

6.主程序如下：

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


namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string msg = "Star";
            //LogHelper.Info(msg);//无法向数据库SQLite添加信息
            LogHelper.Error(msg, new Exception("这是一条异常错误信息"));
            Console.WriteLine(msg);
            Console.ReadLine();
        }
    }
}

代码整体结构如下：
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