How do I log from other classes than the controller in ASP.NET Core?

Question

ASP.NET Core has built-in support for logging, but the documentation states that logging should be done by requesting an ILogger via dependency injection, i.e. by a

Answer 1

Sharing Bjorn Reppens concerns regarding the accepted answer, and taking Cyprien Autexiers comments into account, I ended up with this (boiled down) solution for "built in DI" without "polluting constructors" in "other classes than the controller" in .NET Core 3.1

Factory:

public class Runtime
{
    public static ILogger GetLogger()
    {
        using var serviceScope = host.Services.CreateScope();
        var services = serviceScope.ServiceProvider;
        return services.GetRequiredService>();
    }

    static IHost host;

    CancellationTokenSource CancellationSource { get; } = new CancellationTokenSource();

    Task hostTask;

    public void Start()
    {
        var hostBuilder = Host.CreateDefaultBuilder();
        hostBuilder.ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup());
        host = hostBuilder.Build();
        hostTask = host.RunAsync(CancellationSource.Token);
    }
}

Client:

public class OtherClass
{
    ILogger Logger { get; }

    public OtherClass() => Logger = Runtime.GetLogger();
}

For further abstraction:

public abstract class LoggerBase
{   
    protected ILogger Logger { get; }

    protected LoggerBase() => Logger = RunTime.GetLogger();
}

e.g.

public class OtherClass : LoggerBase
{
    public OtherClass() => Logger.LogInformation("Instantiated");
}