1､安装引用NLog相关依赖
1）使用Nuget界面管理器
搜索"NLog.Web.AspNetCore",在列表中找到它，点击"安装"，然后在搜索"NLog",点击"安装"。
相关文档：VS(Visual Studio)中Nuget的使用
2）使用Package Manager命令安装
PM> Install-Package NLog.Web.AspNetCore
PM> Install-Package NLog
3）使用.NET CLI命令安装
> dotnet add TodoApi.csproj package NLog.Web.AspNetCore
> dotnet add TodoApi.csproj package NLog4) 修改csproj文件
<PackageReference Include="NLog.Web.AspNetCore" Version="4.9.0" />
<PackageReference Include="NLog" Version="4.6.7" />2､创建nlog.config配置文件
在项目根目录创建nlog.config配置文件，内容如下：
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" autoReload="true"
>
<!-- enable asp.net core layout renderers -->
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<targets>
<!--屏幕打印消息-->
<target name="console" xsi:type="ColoredConsole"
layout="${date:format=HH\:mm\:ss} | ${callsite} > ${message}"/>
<!--VS输出窗口-->
<target name="debugger" xsi:type="Debugger"
layout="${date:format=HH\:mm\:ss} | ${level:padding=-5} |${callsite} | ${message}" />
<!--保存至文件-->
<target name="error_file" xsi:type="File" archiveAboveSize="2000000" maxArchiveFiles="30"
fileName="${basedir}/Logs/Error/${shortdate}/error.txt"
layout="${longdate} | ${level:uppercase=false:padding=-5} | ${callsite} | ${message} ${onexception:${exception:format=tostring} ${newline} ${stacktrace} ${newline}" />
<!--保存至文件-->
<target name="info_file" xsi:type="File" archiveAboveSize="2000000" maxArchiveFiles="30"
fileName="${basedir}/Logs/Info/${shortdate}/info.txt"
layout="${longdate} | ${level:uppercase=false:padding=-5} | ${callsite} | ${message} ${onexception:${exception:format=tostring} ${newline} ${stacktrace} ${newline}" />
</targets>
<rules>
<!--<logger name="*" writeTo="console" />-->
<logger name="*" minlevel="Debug" writeTo="debugger" />
<logger name="*" minlevel="Error" writeTo="error_file" />
<logger name="*" minlevel="Info" writeTo="info_file" />
</rules>
</nlog>
或者
<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
autoReload="true"
internalLogLevel="Info"
internalLogFile="c:\temp\internal-nlog.txt">
<!-- enable asp.net core layout renderers -->
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<!-- the targets to write to -->
<targets>
<!-- write logs to file -->
<target xsi:type="File" name="allfile" fileName="c:\temp\nlog-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
<!-- another file log, only own logs. Uses some ASP.NET core renderers -->
<target xsi:type="File" name="ownFile-web" fileName="c:\temp\nlog-own-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
</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 without writeTo -->
<logger name="*" minlevel="Trace" writeTo="ownFile-web" />
</rules>
</nlog>
相关文档：https://github.com/NLog/NLog/wiki/Configuration-file
3､设置nlog.config拷贝到bin
配置nlog.config启用copy to bin文件夹:
或者修改.csproj文件添加下面内容：
<ItemGroup>
<Content Update="nlog.config" CopyToOutputDirectory="PreserveNewest" />
</ItemGroup>4､修改program.cs
using System;
using NLog.Web;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Hosting;
public static void Main(string[] args)
{
var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
try
{
logger.Debug("init main");
CreateHostBuilder(args).Build().Run();
}
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();
}
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
})
.ConfigureLogging(logging =>
{
logging.ClearProviders();
logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
})
.UseNLog(); // NLog: Setup NLog for Dependency injection
5､配置 appsettings.json
在appsettings中指定的日志配置。json覆盖了对SetMinimumLevel的所有调用。因此，要么删除"Default":要么根据需要对其进行正确调整。
{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Trace",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}还请记住更新任何特定于环境的配置，以避免任何意外,例如：
appsettings.Development.json
6､Write记录日志
在controller中注入ILogger ：
using Microsoft.Extensions.Logging;
public class HomeController : Controller
{
private readonly ILogger<HomeController> _logger;
public HomeController(ILogger<HomeController> logger)
{
_logger = logger;
_logger.LogDebug(1, "NLog injected into HomeController");
}
public IActionResult Index()
{
_logger.LogInformation("Hello, this is the index!");
return View();
}相关文档：
.NET Core nlog使用SQLite记录Log日志配置及示例代码
.NET Core和ASP.NET Core 日志框架nlog安装配置及示例代码
.NET Core 2.0 Console(控制台)项目 Microsoft.Extensions.Logging nlog配置使用
https://github.com/NLog/NLog/wiki/Getting-started-with-ASP.NET-Core-3