Install-Package NLog.Extensions.Logging -Pre

<?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="Warn"

      internalLogFile="internal-nlog.txt">

  <!-- define various log targets -->

  <targets>

    <!-- write logs to file -->

    <target xsi:type="File" name="allfile" fileName="Loggers/${shortdate}.log"

                 layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />

    <target xsi:type="File" name="ownFile-web" fileName="Loggers/${shortdate}.log"

             layout="${longdate}|${logger}|${uppercase:${level}}|  ${message} ${exception}" />

    <target xsi:type="Null" name="blackhole" />

  </targets>

  <rules>

    <!--All logs, including from Microsoft-->

    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--Skip Microsoft logs and so log only own logs-->

    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />

    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />

  </rules>

</nlog>

{

  "publishOptions": {

    "include": [

      "wwwroot",

      "Views",

      "appsettings.json",

      "web.config",

      "Config/nlog.config" //加上nlog配置文件

    ]

  }

}

  // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

        public void Configure(IApplicationBuilder app, IHostingEnvironment env,ILoggerFactory loggerFactor)

        {

            if (env.IsDevelopment())

            {

                app.UseDeveloperExceptionPage();

            }

            //此方法被LogManager.LoadConfiguration替代

            //loggerFactor.ConfigureNLog("Config/nlog.config");

            //加载Nlog的nlog.config配置文件

            LogManager.LoadConfiguration("Config/nlog.config");

            //添加NLog

            loggerFactor.AddNLog();

            app.UseMvcWithDefaultRoute();

            app.Run(async (context) =>

            {

                await context.Response.WriteAsync("Hello World!");

            });

        }

   public class BlogController : Controller

    {

        private TestDBContext dBContext;

        private readonly ILogger<BlogController> logger;

        public BlogController(TestDBContext _dBContext, ILogger<BlogController>  _logger)

        {

            dBContext = _dBContext;

            logger = _logger;

        }

        public IActionResult Index()

        {

            logger.LogInformation("你访问了首页55555");

            logger.LogWarning("警告信息55555");

            logger.LogError("错误信息55555");

            var list = dBContext.Blog.Select(a => new BlogViewModel() {

                CreateTime = a.CreateTime,

                Id = a.BlogId,

                Title = a.Title,

                Url = a.Url

            }).ToList();

            return View(list);

        }

}