在ASP.NET Core中依赖注入的方式（非LogManager.GetLogger)使用log4net；Nuget安装2个程序包：log4net、Microsoft.Extensions.Logging.Log4Net.AspNetCore（这个包实现了ILogger和ILoggerProvider这2个接口，.NET Framework不用引用这个程序包）； 新增配置文件，网上很多配置样本，我的是每天一个日志文件，以“LOG/年/月”做目录，以当天日期命名日志文件；
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Log\\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyy\\yyyyMM\\yyyyMMdd'.txt'" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%n记录时间：%date %n线程ID:[%thread] %n日志级别： %-5level %n出错类：%logger property: [%property{NDC}] - %n错误描述：%message%newline %n" />
</layout>
</appender>
<root>
<priority value="ALL"/>
<level value="ALL"/>
<appender-ref ref="rollingAppender" />
</root>
在Program.cs里为HostBuilder配置Log4net
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureLogging(log =>
{
log.ClearProviders();
log.AddFilter("System", LogLevel.Warning);
log.AddFilter("Microsoft", LogLevel.Warning);
log.AddLog4Net("CFGFiles/log4net.config");
}).ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
在Home控制器里依赖注入并使用
public class HomeController : Controller
{
private readonly ILogger _Log;
public HomeController(ILogger<HomeController> logger)
{
this._Log = logger;
}
public IActionResult Index()
{
_Log.LogInformation($"日志记录 LogInformation：{this.GetType()}");
return View();
}
}
结果截图
Processed:
0.013, SQL:
8
