How to override a generic type's log level in serilog

Question

I have ASP.NET WebApi application and apgeneric class as follows:

namespace MyNamespace;

public class MyService<T>
{
    private readonly ILogger<MyService<T>> logger;

    public MyService(ILogger<MyService<T>> logger)
    {
        this.logger = logger;
    }

    public void DoWork()
    {
        logger.LogDebug("Hello World!");
    }
}

I have tried following configurations in order to override log level inside MyService but without success:

{
  "Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "MyNamespace.MyService": "Debug"
      }
    }
  }
}

and

{
  "Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "MyNamespace.MyService<>": "Debug"
      }
    }
  }
}

How do I override log level ONLY for this class?

Answer 1

Logging is configured by logger category, not type. The category is specified when the logger is created using ILoggerFactory.CreateLogger, eg :

public ContactModel(ILoggerFactory logger)
{
    _logger = logger.CreateLogger("MyCategory");
}

Injected loggers use the target type's name as the category. That's not MyService<T> but the concrete type MyService<MyType1> that's getting constructed.

The easiest way to create a separate category for all MyService<T> concrete types is to use a different namespace, eg :

namespace MyNamespace.MyServices;

public class MyService<T>
{
...
}

The other option is to inject ILoggerFactory and create a logger with an explicit category name:

namespace MyNamespace;

public class MyService<T>
{
    private readonly ILogger<MyService<T>> logger;

    public MyService(ILoggerFactory logger)
    {
        this.logger = logger.Create("MyNamespace.MyService");
    }

or

        this.logger = logger.Create($"MyNamespace.MyService.{typeof(T).Name}");