asp.net core NLog将日志写到文件

1、安装Nlog包

Install-Package NLog.Extensions.Logging -Pre

2、在项目添加nlog.config文件

 2.1、nlog.config 

<?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>

3、在项目中添加project.json 配置文件

 

　　3.2、project.json 文件内容

{
  "publishOptions": {
    "include": [
      "wwwroot",
      "Views",
      "appsettings.json",
      "web.config",
      "Config/nlog.config" //加上nlog配置文件
    ]
  }
}

4、在Startup.cs 中Configure方法添加如下代码

  // 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!"); }); }

5、Controller 调用Nlog 方法

   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); } }

 

6、运行项目成功，查看log

log 目录在bin 目录下 

 

7、NLog GitHub 项目

 https://github.com/linezero/Blog/tree/master/NETCoreLogging