Solución:
Un ejemplo minimalista completo de NLog en una aplicación de consola .NET Core 1 (basada en el repositorio NLog.Extensions.Logging):
var services = new ServiceCollection();
services.AddLogging();
var provider = services.BuildServiceProvider();
var factory = provider.GetService<ILoggerFactory>();
factory.AddNLog();
factory.ConfigureNLog("nlog.config");
var logger = provider.GetService<ILogger<Program>>();
logger.LogCritical("hello nlog");
Referencias:
<ItemGroup>
<PackageReference Include="NLog.Extensions.Logging" Version="1.0.0-rtm-beta5" />
<PackageReference Include="Microsoft.Extensions.Configuration" Version="1.1.2" />
<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="1.1.1" />
<PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.2" />
</ItemGroup>
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"
internalLogFile="internal-nlog.txt">
<variable name="Layout"
value="${longdate}|${level:uppercase=true}|${logger}|${message}"/>
<!-- the targets to write to -->
<targets>
<!-- write logs to file -->
<target xsi:type="File"
name="allfile"
fileName="nlog-all-${shortdate}.log"
layout="${Layout}" />
<!-- write to the void aka just remove -->
<target xsi:type="Null" name="blackhole" />
</targets>
<!-- rules to map from logger name to target -->
<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" />
</rules>
</nlog>
En DotNet Core 2, puede usar la clase de inicio ahora y limpiar un poco el código para que se parezca más a la web.
Y como beneficio adicional, una forma de iniciar su aplicación dentro del contenedor DI usando ConsoleApp
Program.cs
static void Main(string[] args)
{
IServiceCollection services = new ServiceCollection();
Startup startup = new Startup();
startup.ConfigureServices(services);
IServiceProvider serviceProvider = services.BuildServiceProvider();
// entry to run app
serviceProvider.GetService<ConsoleApp>().Run();
}
Startup.cs
public class Startup
{
IConfigurationRoot Configuration { get; }
public Startup()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
Configuration = builder.Build();
}
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton<IConfigurationRoot>(Configuration);
services.AddSingleton<IMyConfiguration, MyConfiguration>();
services.AddLogging(loggingBuilder => {
loggingBuilder.AddNLog("nlog.config");
});
services.AddTransient<ConsoleApp>();
}
}
ConsoleApp.cs
public class ConsoleApp
{
private readonly ILogger<ConsoleApp> _logger;
private readonly IMyConfiguration _config;
public ConsoleApp(IMyConfiguration configurationRoot, ILogger<ConsoleApp> logger)
{
_logger = logger;
_config = configurationRoot;
}
public void Run()
{
var test = _config.YourItem;
_logger.LogCritical(test);
System.Console.ReadKey();
}
}
Configuration.cs
public class MyConfiguration : IMyConfiguration
{
IConfigurationRoot _configurationRoot;
public MyConfiguration(IConfigurationRoot configurationRoot)
{
_configurationRoot = configurationRoot;
}
public string YourItem => _configurationRoot["YourItem"];
}
public interface IMyConfiguration
{
string YourItem { get; }
}
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