.net core 集成lognet4

1. nuget 安装  Microsoft.Extensions.Logging.Log4Net.AspNetCore

2.修改

  public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>().ConfigureLogging((hostingContext, logging) =>
                {
                    //I assumed if clearing the providers, may clear the filter configuration, but it turned out it doesnt matter.
                    logging.ClearProviders();
                    logging.SetMinimumLevel(LogLevel.Error);
                    //This won't work, no matter that you properly have configured everything.
                    //logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));

                    logging.AddFilter("Default", LogLevel.Error);
                    logging.AddFilter("Microsoft", LogLevel.Error);
                    logging.AddFilter("System", LogLevel.Error);
                    //I'm adding the debug provider, just so we can compare, in production you can exclude it.
                    logging.AddDebug();
                    logging.AddConsole();
                    logging.AddLog4Net();
                });

3.项目根目录添加log4net.config配置文件

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender" >
    <file value="App_Data/Logs/Logs.txt" />
    <appendToFile value="true" />
    <rollingStyle value="Size" />
    <maxSizeRollBackups value="10" />
    <maximumFileSize value="10000KB" />
    <staticLogFileName value="true" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%-5level %date [%-5.5thread] %-40.40logger - %message%newline" />
    </layout>
  </appender>
  <root>
    <appender-ref ref="RollingFileAppender" />
    <level value="ERROR" />
  </root>
</log4net>