前提：
需要nuget Microsoft.Extensions.Logging.Log4Net.AspNetCore 2.2.6；
描述：解决 .net core 微软日志工厂 Microsoft.Extensions.Logging 增加 log4net 的日志输出，暂时分为 info,Error,Debug 三种类型，按天记录；
实际效果：
.net core webapi 解决办法：
办法1 修改 Program.cs 配置 log4net
public class Program
{
public static void Main(string[] args)
{
CreateWebHostBuilder(args).Build().Run();
} public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.ConfigureLogging((context, logger) =>
{
logger.AddFilter("System", LogLevel.Warning);
logger.AddFilter("Microsoft", LogLevel.Warning);
logger.AddLog4Net();
});
}
办法2 修改 startup.cs http管道配置 Configure
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddLog4Net();
....
}
注：以上两种方法只用一种就好，否则日志输出的时候会有多条 log4net 的记录。
控制器 调用 demo (使用构造函数注入)：
public class HomeController : ControllerBase
{
/// <summary>
/// 日志信息
/// </summary>
ILogger<HomeController> logger; /// <summary>
/// 构造函数配置日志
/// </summary>
/// <param name="logger"></param>
public HomeController(ILogger<HomeController> logger)
{
this.logger = logger;
this.logger.LogError($"{DateTime.Now} LogError 日志");
}
}
.net core 控制台程序实例：
class Program
{
static void Main(string[] args)
{
var logger = new LoggerFactory().AddLog4Net().CreateLogger("logs");
logger.LogError($"{DateTime.Now} LogError 日志");
}
}
log4net 配置文件 log4net.config（该配置跟原 .net 有差别，xml 根节点 为 log4net）
<log4net> <root>
<level value="ALL" ref="infoAppender" />
<appender-ref ref="infoAppender" />
<appender-ref ref="errorAppender" />
<appender-ref ref="debugAppender" />
</root> <!-- 日志的等级，它们由高到底分别为： OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL -->
<!--信息日志配置-->
<appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Logs\Info\info.log" />
<param name="AppendToFile" value="true" />
<param name="MaxFileSize" value="10240" />
<param name="MaxSizeRollBackups" value="100" />
<param name="PreserveLogFileNameExtension" value="true" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="INFO" />
<param name="LevelMax" value="INFO" />
</filter>
</appender> <!--调试日志配置-->
<appender name="debugAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Logs\Debug\debug.log" />
<param name="AppendToFile" value="true" />
<param name="MaxFileSize" value="10240" />
<param name="MaxSizeRollBackups" value="100" />
<param name="PreserveLogFileNameExtension" value="true" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="DEBUG" />
<param name="LevelMax" value="DEBUG" />
</filter>
</appender> <!--错误日志配置-->
<appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Logs\Error\Err.log" />
<param name="AppendToFile" value="true" />
<param name="MaxFileSize" value="10240" />
<param name="MaxSizeRollBackups" value="100" />
<param name="PreserveLogFileNameExtension" value="true" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ERROR" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>
</log4net>