using System;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        BaseApplicationDbContext<Entity> context = null;

        IEntityHandler baseContext = context;

    }

​

    public class BaseEntity { }

    public class Entity : BaseEntity { }

​

    public interface IEntityHandler

    {

        Task HandleSomething(BaseEntity baseEntity);

    }

    public class BaseApplicationDbContext<TEntity> : IEntityHandler

        where TEntity : BaseEntity

    {

        public virtual Lazy<TEntity> Entity { get; set; }

​

        public virtual Task HandleSomething(BaseEntity baseEntity) => Task.CompletedTask;

    }

}

​