Unable to resolve ILogger from Microsoft.Extensions.Logging

ILogger is no longer registered by default but ILogger<T> is. If you still want to use ILogger you can register it manually with the following (in Startup.cs):

public void ConfigureServices(IServiceCollection services)
{
    var serviceProvider = services.BuildServiceProvider();
    var logger = serviceProvider.GetService<ILogger<AnyClass>>();
    services.AddSingleton(typeof(ILogger), logger);
    ...
}

Where AnyClass can be something generic, such as:

public class ApplicationLogs
{
}

So:

public void ConfigureServices(IServiceCollection services)
{
    var serviceProvider = services.BuildServiceProvider();
    var logger = serviceProvider.GetService<ILogger<ApplicationLog>>();
    services.AddSingleton(typeof(ILogger), logger);
    ...
}

ILogger will now resolve via constructor injection.