NLog is not writing when using nlogsettings.json file

Question

I am trying to write logs using ILogger from Microsoft.Extensions.Logging and with NLog as a provider. I added a separate nlogsettings.json file to define configuration because to maintain appsettings file as minimum as possible and also to separate the config files during deployments to higher environments.

Here is my nlosettings.json where all my nlog configuration setup is defined.

    {
      "Logging": {
        "LogLevel": {
          "Default": "Information",
          "Microsoft": "Warning",
          "Microsoft.Hosting.Lifetime": "Information"
        }
      },
      "NLog": {
        "internalLogFile": "c:\\Logs\\internal-nlog.txt",
        "LogLevel": {
          "Default": "Info",
          "Microsoft": "Warn",
          "Microsoft.Hosting.Lifetime": "Information"
        },
        "extensions": [
          { "assembly": "NLog.Extensions.Logging" },
          { "assembly": "NLog.Web.AspNetCore" }
        ],    
        "Targets": {
          "File": {
            "Type": "File",
            "FileName": "c:\\Logs\\service.log",
            "Layout": "${message}"
          }
        },
        "Rules": [
          {
            "Logger": "*",
            "MinLevel": "Debug",
            "WriteTo": "File"
          }
        ]
      }
    }

Here is my Program.cs which is the main entry

    public class Program
        {
        public static void Main(string[] args)
        {
           var logger = LogManager.Setup().LoadConfigurationFromFile("nlogsettings.json").GetCurrentClassLogger();
            logger.Info("Application starts");
            CreateHostBuilder(args).Build().Run();           
        }
    
        private 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();
    }

Here is my Controller . it is not a fancy controller. Just a GET method is returning OK with a message

public class InventoryController : ControllerBase
{
    private readonly ILogger<InventoryController> _logger;        
    public InventoryController(ILogger<InventoryController> logger, ILoggerFactory loggerFactory){_logger = logger;}
    [HttpGet]    
    public async Task<ActionResult> GetInventory()
    {
        await Task.Delay(100);            
        _logger.LogInformation("Testing the nlog log write");
        return Ok("Success");
    }
}

But when I debug it is hitting the breakpoint at logger.LogInformation but is not writing to the folder that is specified in nlogsettings.json. I tried different ways changing nlogsettings file. Can someone check and see if I am missing anything in the above set up?

Rolf Kristensen · Accepted Answer · 2024-03-25 17:53:13Z

1

LogManager.Setup().LoadConfigurationFromFile only supports XML-files, and not JSON-files. It is always a good idea to enable NLog InternalLogger when troubleshooting NLog.

If you install NLog.Extensions.Logging-nuget-package, then you can do this:

var config = new ConfigurationBuilder()
                .SetBasePath(basePath ?? Directory.GetCurrentDirectory())
                .AddJsonFile("nlogsettings.json", optional: false, reloadOnChange: true)
                .Build();
var logger = LogManager.Setup()
                       .LoadConfigurationFromSection(config)
                       .GetCurrentClassLogger();

See also https://github.com/NLog/NLog.Extensions.Logging/wiki/NLog-configuration-with-appsettings.json

answered Mar 25, 2024 at 17:53

Rolf Kristensen

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1 Comment

alienavatar Over a year ago

This is charm!! I have been struggling with 'LoadConfigurationFromFile' and was thinking it woks for all type of files. Thank you so much for your response.

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