Create logs in Main -- The following code logs in Main by getting an ILogger instance from DI after building the host:

CreateLogsinMain.cs

using System;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

class Program
{
    static Task Main(string[] args)
    {
        IHost host = Host.CreateDefaultBuilder(args).Build();

        var logger = host.Services.GetRequiredService<ILogger<Program>>();
        logger.LogInformation("Host created.");

        return host.RunAsync();
    }
}