log4net 控制台和文件和数据库输出三种方式

1、新建console应用项目SendEvaluateDataToProvinceConsole

2、选择SendEvaluateDataToProvinceConsole项目右键 选择 管理NuGet程序包，搜索log4net ，点击安装

3、选择SendEvaluateDataToProvinceConsole项目右键 新建App.config，App.config添加一下内容

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- log4net的定义配置节 -->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <!--日志保存到文件里面Log.txt-->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="Log\Log.txt"/>
      <param name="AppendToFile" value="true"/>
      <param name="MaxSizeRollBackups" value="100"/>
      <param name="MaximumFileSize" value="2MB"/>
      <param name="RollingStyle" value="Size"/>
      <param name="StaticLogFileName" value="true"/>
      <!--<param name="Encoding" value="utf-8" />-->
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%-5p %d [%c] %m%n"/>
      </layout>
    </appender>
    <!--日志输出到Console-->
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
      <mapping>
        <level value="ERROR"/>
        <foreColor value="White"/>
        <backColor value="Red,HighIntensity"/>
      </mapping>
      <mapping>
        <level value="DEBUG"/>
        <backColor value="Green"/>
      </mapping>
      <mapping>
        <level value="Info"/>
        <backColor value="Yellow"/>
      </mapping>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="Debug"/>
        <param name="LevelMax" value="Fatal"/>
      </filter>
    </appender>
    <!--日志输出到数据库-->
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <!--数据表创建脚本-->
      <!--CREATE TABLE LOG(Id integer primary KEY AUTOINCREMENT,Date datetime NOT NULL,UserId varchar(20) NOT NULL,UserName varchar(50) NOT NULL,Message varchar(4000) NOT NULL,Exception varchar(2000) NULL);-->
      <!--日志缓存写入条数-->
      <!--bufferSize表示批处理的日志事件，可以避免每次日志事件都访问数据库,原本是<bufferSize value="100" />一百条才插入-->
      <bufferSize value="1"/>
      <!--日志数据库连接串-->
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="DATABASE=EvMS;SERVER=192.168.1.234;UID=evms;PWD=123456;Connect Timeout=15;" />
      <!--System.Data.SQLite, Version=1.0.65.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139-->
      <!--<connectionType value="System.Data.SQLite.SQLiteConnection, System.Data, Version=1.0.65.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139"/>-->
      <!--<connectionString value="Data source=F:\Person\Longteng\LongtengSln\SendEvaluateDataToProvinceConsole\Data\mysqlite.db;Connect Timeout=15"/>-->
      <!--日志数据库脚本-->
      <commandText value="INSERT INTO LOG([Date],[UserId],[UserName],[Message],[Exception]) VALUES (@Date,@UserId,@UserName,@Message,@Exception)"/>
      <!--日志时间Date -->
      <parameter>
        <parameterName value="@Date"/>
        <dbType value="DateTime"/>
        <layout type="log4net.Layout.RawTimeStampLayout"/>
      </parameter>
      <!--自定义UserId -->
      <parameter>
        <parameterName value="@UserId"/>
        <dbType value="String"/>
        <size value="20"/>
        <layout type="log4net.Layout.PatternLayout"/>
      </parameter>
      <!--自定义UserName -->
      <parameter>
        <parameterName value="@UserName"/>
        <dbType value="String"/>
        <size value="50"/>
        <layout type="log4net.Layout.PatternLayout"/>
      </parameter>
      <!--日志信息Message -->
      <parameter>
        <parameterName value="@Message"/>
        <dbType value="String"/>
        <size value="4000"/>
        <layout type="log4net.Layout.PatternLayout"/>
      </parameter>
      <!--异常信息Exception -->
      <parameter>
        <parameterName value="@Exception"/>
        <dbType value="String"/>
        <size value="2000"/>
        <layout type="log4net.Layout.PatternLayout"/>
      </parameter>
    </appender>
    <root>
      <level value="all"/>
      <appender-ref ref="RollingLogFileAppender"/>
      <appender-ref ref="ColoredConsoleAppender"/>
      <appender-ref ref="AdoNetAppender"/>
    </root>
  </log4net>
  <startup>
    <supportedRuntime version="v2.0.50727"/>
  </startup>
</configuration>

4、Program.cs中添加代码

using log4net;
using System;
using System.Reflection;

namespace SendEvaluateDataToProvinceConsole
{
    class Program
    {
        /// <summary>
        /// 记录日志的日志对象
        /// </summary>
        public static ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        static void Main(string[] args)
        {
            //log4net.Config.XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(@"F:\Person\Longteng\LongtengSln\SendEvaluateDataToProvince\App.config"));
            log4net.Config.XmlConfigurator.Configure();//这一句很重要。。。。。
            try
            {
                Log.Info("123...");
                Log.Info("普通日志");
                Log.Error("错误日志");
                Log.Debug("异常信息");
                Log.Fatal("致命错误");
                Log.Warn("警告信息");
                
                LogEntity logEntity = new LogEntity
                  {
                    //Id= "123",
                    UserId = "123",
                    UserName = "张三",
                    Message = "消息西夏熊",
                    Exception = "Exception"
                    };
 
                   Log.Debug(logEntity);
                   Console.Read();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                Console.WriteLine(e.Source);
                Console.WriteLine(e.StackTrace);
                Console.WriteLine(e.InnerException != null ? e.InnerException.ToString() : "");
                Console.ReadLine();
            }
        }        
    }
}

5、运行结果

6、上图运行结果注意有些数据不太对，就是插入的是LogEntity 对象，显示的就是一个对象，而不是对象具体对应的数据

LogEntity logEntity = new LogEntity
{
//Id= "123",
UserId = "123",
UserName = "张三",
Message = "消息西夏熊",
Exception = "Exception"
};

分析原因是因为LogEntity 是自定义的对象，log4net并不知道LogEntity 是什么东西，所以我们转换一下，把LogEntity 转换成log4net认识的对象就可以了，其实就是修改显示的log4net模式PatternLayout，

代码如下：

先建MyPatternConverter类，继承log4net的PatternLayoutConverter类

using log4net.Core;
using log4net.Layout.Pattern;
using System.IO;
using System.Reflection;

namespace SendEvaluateDataToProvinceConsole
{
    public class MyPatternConverter : PatternLayoutConverter
    {
        protected override void Convert(TextWriter writer, LoggingEvent loggingEvent)
        {
            if (Option != null)
                WriteObject(writer, loggingEvent.Repository, LookupProperty(Option, loggingEvent));
            else
                WriteDictionary(writer, loggingEvent.Repository, loggingEvent.GetProperties());
        }

        //通过反射获取传入的日志对象的某个属性的值
        private object LookupProperty(string property, log4net.Core.LoggingEvent loggingEvent)
        {
            object propertyvalue = string.Empty;
            PropertyInfo propertyInfo = loggingEvent.MessageObject.GetType().GetProperty(property);

            if (propertyInfo != null)
                propertyvalue = propertyInfo.GetValue(loggingEvent.MessageObject, null);
            return propertyvalue;
        }
    }
}

再新建MyLayout类，继承log4net的PatternLayout类

using log4net.Layout;

namespace SendEvaluateDataToProvinceConsole
{
    public class MyLayout : PatternLayout
    {
        public MyLayout()
        {
            this.AddConverter("Property", typeof(MyPatternConverter));
        }
    }
}

上面建好MyPatternConverter类和MyLayout类以后，修改App.config配置文件如下

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- log4net的定义配置节 -->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <!--日志保存到文件里面Log.txt-->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="Log\Log.txt"/>
      <param name="AppendToFile" value="true"/>
      <param name="MaxSizeRollBackups" value="100"/>
      <param name="MaximumFileSize" value="2MB"/>
      <param name="RollingStyle" value="Size"/>
      <param name="StaticLogFileName" value="true"/>
      <!--<param name="Encoding" value="utf-8" />-->//注释掉，使用下面的自定义转换SendEvaluateDataToProvinceConsole.MyLayout，下面的同理
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%-5p %d [%c] %m%n"/>
      </layout>
    </appender>
    <!--日志输出到Console-->
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
      <mapping>
        <level value="ERROR"/>
        <foreColor value="White"/>
        <backColor value="Red,HighIntensity"/>
      </mapping>
      <mapping>
        <level value="DEBUG"/>
        <backColor value="Green"/>
      </mapping>
      <mapping>
        <level value="Info"/>
        <backColor value="Yellow"/>
      </mapping>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="Debug"/>
        <param name="LevelMax" value="Fatal"/>
      </filter>
    </appender>
    <!--日志输出到数据库-->
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <!--数据表创建脚本-->
      <!--CREATE TABLE LOG(Id integer primary KEY AUTOINCREMENT,Date datetime NOT NULL,UserId varchar(20) NOT NULL,UserName varchar(50) NOT NULL,Message varchar(4000) NOT NULL,Exception varchar(2000) NULL);-->
      <!--日志缓存写入条数-->
      <!--bufferSize表示批处理的日志事件，可以避免每次日志事件都访问数据库,原本是<bufferSize value="100" />一百条才插入-->
      <bufferSize value="1"/>
      <!--日志数据库连接串-->
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="DATABASE=EvMS;SERVER=192.168.1.234;UID=evms;PWD=123456;Connect Timeout=15;" />
      <!--System.Data.SQLite, Version=1.0.65.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139-->
      <!--<connectionType value="System.Data.SQLite.SQLiteConnection, System.Data, Version=1.0.65.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139"/>-->
      <!--<connectionString value="Data source=F:\Person\Longteng\LongtengSln\SendEvaluateDataToProvinceConsole\Data\mysqlite.db;Connect Timeout=15"/>-->
      <!--日志数据库脚本-->
      <commandText value="INSERT INTO LOG([Date],[UserId],[UserName],[Message],[Exception]) VALUES (@Date,@UserId,@UserName,@Message,@Exception)"/>
      <!--日志时间Date -->
      <parameter>
        <parameterName value="@Date"/>
        <dbType value="DateTime"/>
        <layout type="log4net.Layout.RawTimeStampLayout"/>
      </parameter>
      <!--自定义UserId -->
      <parameter>
        <parameterName value="@UserId"/>
        <dbType value="String"/>
        <size value="20"/>
        <!--<layout type="log4net.Layout.PatternLayout"/>-->
        <layout type="SendEvaluateDataToProvinceConsole.MyLayout">
          <conversionPattern value="%Property{UserId}" />
        </layout>
      </parameter>
      <!--自定义UserName -->
      <parameter>
        <parameterName value="@UserName"/>
        <dbType value="String"/>
        <size value="50"/>
        <!--<layout type="log4net.Layout.PatternLayout"/>-->
        <layout type="SendEvaluateDataToProvinceConsole.MyLayout">
          <conversionPattern value="%Property{UserName}" />
        </layout>
      </parameter>
      <!--日志信息Message -->
      <parameter>
        <parameterName value="@Message"/>
        <dbType value="String"/>
        <size value="4000"/>
        <!--<layout type="log4net.Layout.PatternLayout"/>-->
        <layout type="SendEvaluateDataToProvinceConsole.MyLayout">
          <conversionPattern value="%Property{Message}" />
        </layout>
      </parameter>
      <!--异常信息Exception -->
      <parameter>
        <parameterName value="@Exception"/>
        <dbType value="String"/>
        <size value="2000"/>
        <!--<layout type="log4net.Layout.PatternLayout"/>-->
        <!--<layout type="log4net.Layout.ExceptionLayout" />-->
        <layout type="SendEvaluateDataToProvinceConsole.MyLayout">
          <conversionPattern value="%Property{Exception}" />
        </layout>
      </parameter>
    </appender>
    <root>
      <level value="all"/>
      <appender-ref ref="RollingLogFileAppender"/>
      <appender-ref ref="ColoredConsoleAppender"/>
      <appender-ref ref="AdoNetAppender"/>
    </root>
  </log4net>
  <startup>
    <supportedRuntime version="v2.0.50727"/>
  </startup>
</configuration>

 在运行的话数据库中的运行结果如下：