Wire and inject NLog into .NET Core console app

Question

I created a consumer/job that I will have running as a process on Linux written in C#.

The process will:

1. Read a message from RabbitMQ
2. Make changes to the database
3. Log any errors

All the documentation on NLog about .NET Core are on ASP.NET Core. When I try to get an ILogger implementation, it returns null.

Here is an except of wiring and usage:

static void ConfigureServices()
{
    string environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

    var builder = new ConfigurationBuilder()
         .SetBasePath(Path.Combine(AppContext.BaseDirectory))
         .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
         .AddJsonFile($"appsettings.{environment}.json", optional: true);

    var services = new ServiceCollection();

    Configuration = builder.Build();

    [...]

    services.AddLogging();

    ServiceProvider = services.BuildServiceProvider();

    var loggerFactory = ServiceProvider.GetService<ILoggerFactory>();
    loggerFactory.AddNLog();
}

static void Main(string[] args)
{
    ConfigureServices();
    
    var logger = ServiceProvider.GetService<NLog.ILogger>();

    logger.Debug("Logging");

    [...]
}

Do not be confused with the environment variable ASPNETCORE_ENVIRONMENT; it is used solely to determine which appsettings.json to use.

I've based my code on this issue report.

Finally, these are the packages I currently have installed.

<ItemGroup>
  <PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.2" />
  <PackageReference Include="Microsoft.Extensions.Configuration" Version="1.1.2" />
  <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="1.1.2" />
  <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="1.1.2" />
  <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.2" />
  <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="1.1.2" />
  <PackageReference Include="NLog" Version="5.0.0-beta09" />
  <PackageReference Include="NLog.Extensions.Logging" Version="1.0.0-rtm-beta5" />
  <PackageReference Include="Npgsql" Version="3.2.4.1" />
  <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="1.1.0" />
</ItemGroup>

Answer 1

A complete minimalistic example of NLog in a .NET Core 1 console app (based on NLog.Extensions.Logging repository):

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");

References:

    <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>