1､.NET Core 2.0项目中安装引用NLog相关依赖
1）使用Nuget界面管理器
搜索"NLog.Extensions.Logging",在列表中找到它，点击"安装"，在分别搜索"NLog"、"Microsoft.Extensions.DependencyInjection"和“Microsoft.Extensions.Configuration.Json”,然后在点击"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.Extensions.Logging
PM> Install-Package NLog
PM> Install-Package Microsoft.Extensions.DependencyInjection
PM> Install-Package Microsoft.Extensions.Configuration.Json
3）使用.NET CLI命令安装
> dotnet add TodoApi.csproj package NLog.Extensions.Logging
> dotnet add TodoApi.csproj package NLog
> dotnet add TodoApi.csproj package Microsoft.Extensions.DependencyInjection
> dotnet add TodoApi.csproj package Microsoft.Extensions.Configuration.Json
4) 修改csproj文件
<ItemGroup>
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.1.0" />
<PackageReference Include="NLog" Version="4.6.5" />
<PackageReference Include="NLog.Extensions.Logging" Version="1.5.1" />
</ItemGroup>
2､创建nlog.config配置文件
在应用程序项目的根目录中创建nlog.config（全部小写）文件(文件属性：始终复制):
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､修改.NET Core 2.0项目代码
1) 创建runner class
public class Runner
{
private readonly ILogger<Runner> _logger;
public Runner(ILogger<Runner> logger)
{
_logger = logger;
}
public void DoAction(string name)
{
_logger.LogDebug(20, "Doing hard work! {Action}", name);
}
}
2) 配置依赖注入(DI：Dependency injector)container
private static IServiceProvider BuildDi(IConfiguration config)
{
return new ServiceCollection()
.AddTransient<Runner>() // Runner is the custom class
.AddLogging(loggingBuilder =>
{
// configure Logging with NLog
loggingBuilder.ClearProviders();
loggingBuilder.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
loggingBuilder.AddNLog(config);
})
.BuildServiceProvider();
}
3) 引用所需的命名空间
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using NLog;
using NLog.Extensions.Logging;
4) 修改main()方法
创建DI container,获取到Runner实例并运行：
static void Main(string[] args)
{
var logger = LogManager.GetCurrentClassLogger();
try
{
var config = new ConfigurationBuilder()
.SetBasePath(System.IO.Directory.GetCurrentDirectory()) //From NuGet Package Microsoft.Extensions.Configuration.Json
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.Build();
var servicesProvider = BuildDi(config);
using (servicesProvider as IDisposable)
{
var runner = servicesProvider.GetRequiredService<Runner>();
runner.DoAction("Action1");
Console.WriteLine("Press ANY key to exit");
Console.ReadKey();
}
}
catch (Exception ex)
{
// NLog: catch any exception and log it.
logger.Error(ex, "Stopped program because of exception");
throw;
}
finally
{
// Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
LogManager.Shutdown();
}
}
相关文档：
Getting-started-with-.NET-Core-2---Console-application
ASP.NET Core 3.0安装配置使用NLog的方法及示例代码
.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