在DotNet2.1项目的Rider中配置log4net

<ItemGroup>
  <PackageReference Include="log4net" Version="x.x.x" />
</ItemGroup>

using log4net;
using log4net.Config;

namespace YourNamespace
{
    public class YourClass
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(YourClass));

        static YourClass()
        {
            XmlConfigurator.Configure(); // 加载log4net配置文件
        }

        // 其他类成员和方法
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
    </layout>
  </appender>
  
  <root>
    <level value="DEBUG" />
    <appender-ref ref="ConsoleAppender" />
  </root>
</log4net>

log.Debug("This is a debug message");
log.Info("This is an info message");
log.Warn("This is a warning message");
log.Error("This is an error message");
log.Fatal("This is a fatal message");