I'm using .NET 6 minimal APIs for a web service. I have NLog configured and working well using "appsettings.json" by using this:

builder.Services.AddLogging(loggingBuilder =>
{
    loggingBuilder.AddNLog(new NLogLoggingConfiguration(builder.Configuration.GetSection("NLog")));
});

I'm logging to a database, but I don't want the messages from Microsoft (e.g. "Microsoft.Hosting.Lifetime" and "Microsoft.AspNetCore.Hosting.Diagnostics"). There seem to be a lot of similar questions about this, but the vast majority use "NLog.config". I haven't found a solution that works using "appsettings.json". According to everything I've read, this should be trivial using a rule something like the following:

{
  "logger": "Microsoft.*",
  "finalMinLevel": "Error"
}

However this does not work for me.

The only thing I've gotten to work is to "filter in" the namespace I want, rather than filtering out the ones I don't. For example, rather than

{
  "logger": "*",
  "minLevel": "Information",
  "writeTo": "database"
}

I use

{
  "logger": "myNamespace.*",
  "minLevel": "Information",
  "writeTo": "database"
}

This is clearly not my preference.

Any ideas? Thanks in advance!

CodePudding user response：

Notice that NLog v5 introduce the following breaking change NLog.Extensions.Logging without any filter

You can explict specify RemoveLoggerFactoryFilter = false for the NLog-options-input-parameter for AddNLog. Alternative you can specify RemoveLoggerFactoryFilter for the "NLog" logger in appsettings.json. Yet another alternative is to use finalMinLevel in the NLog-Logging-Rules.

When using finalMinLevel then it is important that they are placed in top of the "rules": []-array, so they will block the LogEvents from reaching the other rule-items below.

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

CodePudding user response：

The credit for this answer needs to go to Rolf. He said the order of the rules matters, and with that advice I solved my problem. My rules now look like this, and it works exactly as I'd been wanting.

"rules": [
  {
    "logger": "Microsoft.*",
    "finalMinLevel": "Warn"
  },
  {
    "logger": "*",
    "minLevel": "Information",
    "writeTo": "database"
  }
]