Dependency Injection wth NLog

Question

I've got a .NET Core web app that I'm trying to add logging to via NLog. In previous projects, I've just used something like the following at the top of every class:

private static Logger logger = LogManager.GetCurrentClassLogger();

I'm trying to follow more best practices with this project where possible.

My question is, how can I inject a logger which has the fully qualified name of the class that it's being injected into?

In my startup.cs file, so far I've got the following:

services.AddScoped<BLL.Logging.NLogLogger>();

At the moment, the NLogLogger class creates an instance of an NLog Logger via GetCurrentClassLogger(), which when used will only ever report the name as "BLL.Logging.NLogLogger" rather than the actual class that the logger is being injected into.

To simplify the question and make it a bit more generic: How can you pass in the name of the class that .NET Core is going to inject a class into?

I've thought about something like the below, but not sure how to achieve it:

services.AddScoped<BLL.Logging.NLogLogger>(serviceProvider => new BLL.Logging.NLogLogger("class name here"));

Answer 1

Using DI specify ILogger<T> type instead of Logger, where T is the class type that uses the logger, so NLog will know about the class. For example:

public class TodoController : Controller
{
    private readonly ILogger _logger;

    public TodoController(ILogger<TodoController> logger)
    {
        _logger = logger;
    }
}

References:

• Getting started with ASP.NET Core (csproj vs2017)
• Getting started with ASP.NET Core 2
• Getting started with ASP.NET Core 3