ILogger

By default, ILogger is included in an ASP.NET Core project.

Log Levels

There are six log levels available:

1. Trace - The lowest level
2. Debug
3. Information
4. Warning
5. Error
6. Critical - The highest level

Not all logs need to be processed or displayed in your console or database. You can configure the logger to only process logs above a certain level, filtering out less critical entries.

Logger Configuration

For development, you can configure logging settings in appsettings.Development.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",             // Default log level for the application           
      "Microsoft.AspNetCore": "Warning"     // Only display logs at level Warning or higher
    }
  }
}

This configuration ensures that logs for your application will display at least Information level, while logs from ASP.NET Core (e.g., framework-related logs) will be filtered to show Warning level and above.

Custom Configuration for Specific Classes

If you want to set a specific log level for a particular class or controller, you can add more specific entries in the .json file. For example:

appsettings.Development.json

{
  "Logging": {
    "LogLevel": {
      "WeatherAppAPI.Controllers.WeatherForecastController": "",    // Specific to this controller
      "WeatherAppAPI.Controllers": "",  // Applies to all classes in this namespace
    }
  }
}

In this example, the log level for WeatherForecastController is set to Debug, while all controllers in the WeatherAppAPI.Controllers namespace will have a minimum level of Information.