(转).NET Core 使用 log4net

https://blog.csdn.net/liyazhen2011/article/details/83382221

1.安装log4net 
    建立.NET Core工程 - 右键 - 管理NuGet程序包 - 搜索log4net - 安装。

2.日志输出到控制台
using log4net;
using log4net.Config;
using log4net.Repository;
using System;

namespace LogTest
{
class Program
{
static void Main(string[] args)
{
ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
BasicConfigurator.Configure(repository);
ILog log = LogManager.GetLogger(repository.Name, "NETCorelog4net");

log.Info("NETCorelog4net log");
log.Error("error");
log.Warn("warn");
Console.ReadKey();
}
}
}
    运行结果：

3.日志输出到文件
    添加配置文件config.xml（右键 - 属性 - 复制到输出目录 - 始终复制），文件的内容如下：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<!-- This section contains the log4net configuration settings -->
<log4net>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
</appender>

<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.log" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="logfile/" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<staticLogFileName value="false" />
<datePattern value="yyyyMMdd'.log'" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="1MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>

<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="ConsoleAppender" />
<appender-ref ref="FileAppender" />
<appender-ref ref="RollingLogFileAppender" />
</root>

</log4net>
</configuration>
using log4net;
using log4net.Config;
using log4net.Repository;
using System;
using System.IO;

namespace LogTest
{
class Program
{
static void Main(string[] args)
{
ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
XmlConfigurator.Configure(repository, new FileInfo("config.xml"));
ILog log = LogManager.GetLogger(repository.Name, "NETCorelog4net");

log.Info("NETCorelog4net log");
log.Error("error");
log.Warn("warn");
Console.ReadKey();
}
}
}
     控制台的输出如下：

另外，生成一个文件夹logfile和一个以运行时的日期命名的文件20181025.log（配置文件中指定）。

---------------------
作者：万里归来少年心
来源：CSDN
原文：https://blog.csdn.net/liyazhen2011/article/details/83382221
版权声明：本文为博主原创文章，转载请附上博文链接！