ILogger with Null Object Pattern

ILoggerNullObject.cs

using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using System;
namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            new Example().Print("Hello World!");
        }
    }
    public class Example
    {
        readonly ILogger _logger;
        public Example(ILogger logger = null)
        {
            _logger = logger ?? NullLogger.Instance;
        }
        public void Print(string message)
        {
            _logger.LogTrace("Logged message: {message}", message);
            Console.WriteLine(message);
        }
    }
}