How to use NLog in a .Net Core Console App

[spottedmahn]

If I'm building a .net core console app, is this the version of NLog I should use?

Thanks,
Mike D.

[304NotModified]

Yes it is!

[spottedmahn]

Thanks @304NotModified! Any examples on how to configure it?

I was performing this:

var loggerFactory = serviceProvider.GetService<ILoggerFactory>();
loggerFactory.AddNLog();
loggerFactory.ConfigureNLog("nlog.config");

but I was getting System.IO.FileNotFoundException: 'NLog.Web.AspNetCore'. I ended adding a nuget reference to NLog.Web.AspNetCore and now it is working.

Doesn't seem right though; having a dependency on NLog.Web.AspNetCore in a console app. Maybe I was doing something wrong?

[304NotModified]

NLog.Web.AspNetCore should not be needed. I will try to create an example

[304NotModified]

ow here is an example:

https://github.com/NLog/NLog.Extensions.Logging/blob/master/examples/net-fullframework-example/src/net-app-using-nlog/Program.cs

[spottedmahn]

@304NotModified can you clarify why there should be a dependency on NLog.Web.AspNetCore in a Console App? It's console app not a web app. Just curious. Thanks for your assistance here!!

[304NotModified]

oops, ment NOT needed. Of course having a ASP.NET Core dependency in a console app would be ridiculous.

Please note that earlier versions (the alphas) of NLog.Extensions.Logging where ASP.NET Core only as MS build it then only for ASP.NET Core

[spottedmahn]

I see, thanks @304NotModified.

I figured out what I was doing wrong. From the nlog.config I got from my web project, it had:

  <extensions>
    <!--enable NLog.Web for ASP.NET Core-->
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

Once I delete that, the exception went away. I created a sample app here to debug it.

[azaytsev-csr]

This example is for a full .net framework though, is there one for .net core 1.1?

[304NotModified]

https://github.com/NLog/NLog.Extensions.Logging/tree/master/examples/aspnet-core-example-vs2017

[304NotModified]

See also https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-(csproj---vs2017)

[azaytsev-csr]

@304NotModified Both of these say we need to reference Web packages? i thought this thread says 'console app'. Are there any examples without that?

[sonofaforester]

Why is this bug closed?

[304NotModified]

there is no bug here. Maybe needs some docs, feel free to add to the wiki

[304NotModified]

And example of the console is here: (using Autofac)

https://github.com/NLog/NLog.Extensions.Logging/blob/master/examples/net-fullframework-example/src/net-app-using-nlog/Program.cs

bit hidden. We need to restructure the example folder I guess

[sonofaforester]

Thanks for the reply, unfortunately that is a .Net Framework 4.5.1 example. The title says he's looking for a .NET Core Console app example. I am too. I'll gladly add to the wiki if I can get something working, but so far no go.

[sonofaforester]

So the problem I was having is that it doesn't seem to automatically find the NLog.config file like it did in .Net Framework. Here's some sample code that works, with the caveat that I get a segmentation fault when the program exits. I'm using NLog 5.0.0-beta10.

using System;
using NLog;
using NLog.Config;

namespace nlogging
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            LogManager.Configuration = new XmlLoggingConfiguration($"{AppContext.BaseDirectory}NLog.config");

            var logger = LogManager.GetLogger("Example");
            logger.Info("log info");
            logger.Debug("log debug");
        }
    }
}

[304NotModified]

So the problem I was having is that it doesn't seem to automatically find the NLog.config

That's indeed a known issue.

Also in the .NET Core way you should use DI and .ConfigureNLog method

[304NotModified]

There is a tutorial now (really for console!)

see here: https://github.com/NLog/NLog.Extensions.Logging/wiki/Getting-started-with-.NET-Core-2---Console-application