NetCore使用Nlog记录日志

当前环境： win10+vs2019+netcore3.1

添加Nuget包引用：NLog.Web.AspNetCore

 2. 添加 nlog.config配置文件 或者安装包 nlog.confg

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Info"
      internalLogFile="c:	empinternal-nlog.txt">

    <!-- enable asp.net core layout renderers -->
    <extensions>
        <add assembly="NLog.Web.AspNetCore"/>
    </extensions>

    <!-- the targets to write to -->
    <targets>
        <!-- write logs to file  -->
        <target xsi:type="File" name="allfile" fileName="logs
log-all-${shortdate}.log"
                layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />

        <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
        <target xsi:type="File" name="ownFile-web" fileName="logs
log-own-${shortdate}.log"
                layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
    </targets>

    <!-- rules to map from logger name to target -->
    <rules>
        <!--All logs, including from Microsoft-->
        <logger name="*" minlevel="Trace" writeTo="allfile" />

        <!--Skip non-critical Microsoft logs and so log only own logs-->
        <logger name="Microsoft.*" maxlevel="Info" final="true" />
        <!-- BlackHole without writeTo -->
        <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
    </rules>
</nlog>

3. 在CreateHostBuilder 中添加使用Nlog ( ConfigureLogging)

public static IHostBuilder CreateHostBuilder(string[] args)
{
       return Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                }).ConfigureLogging(
                    logging =>
                    {
                        // 清除系统默认的日志
                        //logging.ClearProviders();
                        logging.SetMinimumLevel(LogLevel.Trace);
                    }).UseNLog();
}

4. 配置文件路径

NLog.Web.NLogBuilder.ConfigureNLog("nlog.config")

5. 调用

    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
            _logger.LogDebug(1, "NLog injected into HomeController");
        }

        public IActionResult Index()
        {
            _logger.LogInformation("Hello, this is the index!");
            return View();
        }
}

6. 效果

在binDebug etcoreapp3.1 目录下生成了logs文件夹