No effect setting loglevel from appSettings.json

Hi, I’m trying to combine the log configuration from code/appSettings.json/NLog.config in a .net core console application (.NET Core 3.1). I started from the online example adding the load of the appSettings.json. So I have

In the code

// Inspecting config at runtime I see the value: [0] = {[Logging:LogLevel:Default, Warning]}
//...
.AddLogging(loggingBuilder =>
{
	loggingBuilder.ClearProviders();
	loggingBuilder.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
	loggingBuilder.AddNLog(config);
})

In appSettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  }
}

In Nlog.config

<logger name="*" minlevel="Trace" writeTo="f" />

I expected to have an output filtered on Warning level, but I have all the levels contained in the code; 2020-01-16 11:54:26.9520 TRACE Doing hard work! Action1 2020-01-16 11:54:26.9881 DEBUG Doing hard work! Action1 2020-01-16 11:54:26.9881 INFO Doing hard work! Action1 2020-01-16 11:54:26.9881 WARN Doing hard work! Action1 2020-01-16 11:54:26.9881 ERROR Doing hard work! Action1 2020-01-16 11:54:26.9881 FATAL Doing hard work! Action1

It works when I change the min level in code or nlog.config from trace to warning: 2020-01-16 12:27:47.1587 WARN Doing hard work! Action1 2020-01-16 12:27:47.1927 ERROR Doing hard work! Action1 2020-01-16 12:27:47.1927 FATAL Doing hard work! Action1

What am I doing wrong? This is the simple project: ConsoleAppLog.zip

[toniopettinato]

Perfect, it works with the AddConfiguration() I agree, it is probably not convenient to have multiple configurations (MEL + NLog). I did it just to understand how the chain works.

[snakefoot]

People that decide to use NLog usually also want to disable all MEL-filtering to avoid the confusion with two filtering systems. So the NLog wiki-tutorial is targeted those users.

I guess people who are MEL-users first will probably just use new HostBuilder().CreateDefaultBuilder().Build() (Will setup everything with all guns enabled).

But if staying with the simple example, then you need to remove:

loggingBuilder.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);

And add:

loggingBuilder.AddConfiguration(config.GetSection("Logging"));

So it looks like this:

serviceCollection.AddLogging(loggingBuilder =>
{
   loggingBuilder.ClearProviders();
   loggingBuilder.AddConfiguration(config.GetSection("Logging"));
   loggingBuilder.AddNLog(config);
})

ILoggingBuilder.AddConfiguration can be found at Nuget: Microsoft.Extensions.Logging.Configuration