一、新建ASP.NET Core 2.0 MVC项目，使用NuGet在浏览中搜索：NLog.Web.AspNetCore，如下图所示：
二、在项目的根目录下新建一个xml类型的nlog.config文件
nlog.config文件内容如下：
<?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="nlog-all-${shortdate}.log"
layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" /> <target xsi:type="File" name="ownFile-web" fileName="nlog-my-${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>
三、在Startup类中添加配置
在Configure方法中增加ILoggerFactory loggerFactory参数，然后添加2行代码， 如下所示：
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
} app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseAuthentication(); loggerFactory.AddNLog();//*****使用NLog作为日志记录工具
env.ConfigureNLog("Nlog.config");//*****引入Nlog配置文件 app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
四、Program.cs中绑定
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.UseNLog();//使用Nlog日志
五、在控制器IActionResult中使用Nlog
//获得日志的实例
public static Logger nlog = LogManager.GetCurrentClassLogger();
public IActionResult Index()
{
nlog.Info("普通信息日志-----------");
nlog.Debug("调试日志-----------");
nlog.Error("错误日志-----------");
nlog.Fatal("异常日志-----------");
nlog.Warn("警告日志-----------");
nlog.Trace("跟踪日志-----------");
nlog.Log(LogLevel.Warn, "Log日志------------------");
return View();
}
注：NLog日志的位置默认是在bin\Debug下面。
参考：http://www.voidcn.com/article/p-hukbuiwx-bch.html
其他参考的nlog.config配置文件
<?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"
throwConfigExceptions="true"
internalLogLevel="info"
internalLogFile="d:\log\internal-nlog.txt"> <!-- the targets to write to -->
<targets>
<!-- write logs to file -->
<target xsi:type="File" name="allfile" fileName="d:\log\nlog-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" /> <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
<target xsi:type="File" name="ownFile-web" fileName="d:\log\nlog-own-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}|${callsite}" />
</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 -->
<logger name="*" minlevel="Trace" writeTo="ownFile-web" />
</rules>
</nlog>