asp.net core 使用 NLog日志

NLog是一个配置灵活的日志记录类库，拥有输出日志到文件、存储入库、发送到udp地址的高级功能

1 添加 nlog nuget包

Nlog和NLog.Web.AspNetCore

安装完成后

 

2 在站点根目录下添加配置文件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">

<targets>

<target xsi:type="File" name="file" fileName="nlog-all-${shortdate}.log"

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

<target xsi:type="File" name="exception" fileName="nlog-exception-${shortdate}.log"

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

<target xsi:type="File" name="trace" fileName="nlog-trace-${shortdate}.log"

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

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

</targets>

<rules>

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

<!--日志级别：Trace -》Debug-》 Information -》Warning-》 Error-》 Critical-->

<!--排除系统日志-->

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

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

<logger name="*" minlevel="Error" maxlevel="Error" writeTo="exception" />

</rules>

</nlog>

设置配置文件属性：始终复制

3修改Startup.cs文件

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

{

if (env.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Home/Error");

app.UseHsts();

}

//添加nlog支持

loggerFactory.AddNLog();

app.UseHttpsRedirection();

app.UseStaticFiles();

app.UseCookiePolicy();

app.UseMvc(routes =>

{

routes.MapRoute(

name: "default",

template: "{controller=Home}/{action=Index}/{id?}");

});

}

4在控制器代码中使用 Microsoft.Extensions.Logging;输出日志

public class HomeController : Controller

{

//定义logger接口

private static ILogger<HomeController> _logger;

public HomeController(ILogger<HomeController> logger)

{

_logger = logger;

}

public IActionResult Index()

{

_logger.LogInformation("info test");

_logger.LogTrace("trace test");

_logger.LogError("error test");

return View();

}

}

5 使用nlog自己的logger输出日志, 这样就不用使用依赖注入了，在一些特定的环境下一样可以使用

public class NLogController : Controller

{

//定义logger接口

private static NLog.Logger _logger;

public NLogController()

{

_logger = NLog.LogManager.GetCurrentClassLogger();

}

public IActionResult Index()

{

_logger.Error("nlog test");

return Content("nlog");

}

}

6在站点根目录下查看日志文件

aspnetcore_nlog\aspnetcore_nlog\bin\Debug\netcoreapp2.1

github地址：https://github.com/sandsli/asp.netcore-blog-demo/tree/master/nlog