微软日志工厂 Microsoft.Extensions.Logging 中增加 log4net 的日志输出

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()
                .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
    {
        /// 

        /// 日志信息
        /// 
        ILogger logger;

        /// 

        /// 构造函数配置日志
        /// 
        /// 
        public HomeController(ILogger 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>

  
  
  <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>

  
  <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>

  
  <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>