using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;

namespace test_reflect
{
    class Program
    {
        static async Task Main(string[] args)
        {
            List<IBase> commands = new List<IBase>();

            foreach (var type in Assembly.GetExecutingAssembly().GetTypes())
            {
                if (typeof(IBase).IsAssignableFrom(type) && !type.IsAbstract)
                {
                    commands.Add(Activator.CreateInstance(type) as IBase);
                }
            }
        }
    }

    public interface IBase { }

    public class SomeCommand : IBase {}
    public class OtherCommand : IBase {}
    public class AdditionalCommand : IBase {}
}