1.log4net
1）新建一个Net空白项目，在引用出点击管理NuGet程序包，搜索log4net并安装
2）建立log4net.config配置文件
在configuration里面添加如下代码，级别为All,log的所有消息都可以调用
<!--配置小节——版本声名-->
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net-net-2.0.8.0"/>
</configSections> <log4net>
<!--记录器，程序入口-->
<logger name="logFile">
<level value="All"/>
<appender-ref ref="LogFileAppender" />
</logger>
<!--附属配置-->
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="./Log/log.txt" />
<param name="AppendToFile" value="true" /> <layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%n＝＝＝＝＝＝＝＝＝＝
%n【日志级别】%-5level
%n【记录时间】%date
%n【线程编号】[%thread]
%n【执行时间】[%r]毫秒
%n【出错文件】%F
%n【出错行号】%L
%n【出错的类】%logger 属性[%property{NDC}]
%n【错误描述】%message
%n【错误详情】%newline"/>
</layout>
</appender>
</log4net>
并且右键属性，设置 复制到输出目录 为 如果较新则复制
3）在AssemblyInfo添加config入口
[assembly: log4net.Config.DOMConfigurator(ConfigFile = "log4net.config", ConfigFileExtension = "config", Watch = true)]
4）添加一个button，在click项目里面添加调用日志代码
int i = , j = ;
try
{
int result = i / j;
}
catch(Exception ex)
{
log.Error("出错了！", ex);
}
2.封装LogHelper（和上面无关，这个是封装一个LogHelper，包括配置）
添加Nuget包log4net
新建一个标准库LogHelper
using log4net;
using log4net.Config;
using log4net.Repository;
using System;
using System.IO;
[assembly: XmlConfigurator(Watch = true)]
namespace LogHelper
{
public class Log4Helper
{
private static ILog logger = null;
public static void LogInfo(string logstr)
{
if (logger == null)
InitLog4net();
logger.Info(logstr);
}
public static void LogError(string logstr, Exception ex = null)
{
if (logger == null)
InitLog4net();
logger.Error(logstr);
if (ex != null)
logger.Error(ex.ToString());
}
private static object objlock = new object();//初始化log用的锁
private static void InitLog4net()
{
lock (objlock)
{
ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
//获取配置文件路径
var conpath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config");
XmlConfigurator.Configure(repository, new FileInfo(conpath));
logger = LogManager.GetLogger(repository.Name, "NETCorelog4net");
}
}
}
}
在类库添加log4net.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<log4net>
<root>
<level value="INFO" />
<appender-ref ref="infoAppender" />
<appender-ref ref="errorAppender" />
<appender-ref ref="sqlAppender" />
</root>
<appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
<file value="log/" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<staticLogFileName value="false" />
<datePattern value="'error'yyyyMMdd'.log'" />
<maxSizeRollBackups value="" />
<maximumFileSize value="1MB" />
<threshold value="ERROR" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline--------%date--------%newline%message" />
</layout>
</appender>
<appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
<file value="log/" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<staticLogFileName value="false" />
<datePattern value="'info'yyyyMMdd'.log'" />
<maxSizeRollBackups value="" />
<maximumFileSize value="1MB" />
<threshold value="INFO" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline--------%date--------%newline%message" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="Info" />
<param name="LevelMax" value="Info" />
</filter>
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
</log4net>
</configuration>
打包，其他项目引用这个包，会自动生成log4net.config，设置属性 复制到输出目录->如果较新则复制
使用起来也很简单
Log4Helper.LogInfo("进来了");
Log4Helper.LogError("error");
Log4Helper.LogError("error", ex);