Nlog日志

第一步：下载Newget包

第二步： 新建配置文件 nlog.config （xml文件 名字保持一直）

<?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:\temp\internal-nlog-AspNetCore.txt">

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

<!-- the targets to write to -->
<targets>
<!-- File Target for all log messages with basic details -->
<target xsi:type="File" name="allfile" fileName="c:\temp\nlog-AspNetCore-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId:whenEmpty=0}|${level:uppercase=true}|${logger}|${message} ${exception:format=tostring}" />

<!-- File Target for own log messages with extra web details using some ASP.NET core renderers -->
<target xsi:type="File" name="ownFile-web" fileName="c:\temp\nlog-AspNetCore-own-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId:whenEmpty=0}|${level:uppercase=true}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}|${callsite}" />

<!--Console Target for hosting lifetime messages to improve Docker / Visual Studio startup detection -->
<target xsi:type="Console" name="lifetimeConsole" layout="${MicrosoftConsoleLayout}" />
</targets>

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

<!--Output hosting lifetime messages to console target for faster startup detection -->
<logger name="Microsoft.Hosting.Lifetime" minlevel="Info" writeTo="lifetimeConsole, ownFile-web" final="true" />

<!--Skip non-critical Microsoft logs and so log only own logs (BlackHole) -->
<logger name="Microsoft.*" maxlevel="Info" final="true" />
<logger name="System.Net.Http.*" maxlevel="Info" final="true" />

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

第三步：修改Progrom

using NLog;
using NLog.Web;

var logger = NLog.LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
logger.Debug("init main");

try
{

// Add services to the container.
builder.Logging.ClearProviders();
builder.Host.UseNLog();

}
catch (Exception exception)
{
// NLog: catch setup errors
logger.Error(exception, "Stopped program because of exception");
throw;
}
finally
{
// Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
NLog.LogManager.Shutdown();
}

第四步：在程序中引用 （Microsoft.Extensions.Logging命名空间）

//构造函数注入
private readonly ILogger<UserController> _logger;

public UserController(ILogger<UserController> logger)
{
_logger = logger;
}

[HttpGet]
public IActionResult Get()
{
//测试
_logger.LogInformation("测试Nlog");
_logger.LogError( "异常测试");
_logger.LogDebug("啊实打实");
return Ok("ok");
}