Base Class type for ILogger using Dependency Injection

use a none generic ILogger in your base class, but ILogger<DerivedClass> in your derived class. This way you can simply pass the ILogger to your base class if needed:

public abstract class BaseClassExample
{
    private readonly ILogger logger;

    public class BaseClassExample(ILogger logger)
    {
        this.logger = logger;
    }
}

and

public class DerivedClass : BaseClassExample
{
    private readonly ILogger<DerivedClass> logger;

    public class BaseClassExample(ILogger<DerivedClass> logger)
                  :base(logger)
    {
        this.logger = logger;
    }
}

this way not only you can use it easier if you somehow end up with two derived class you can use ILogger in both of them.