public class BaseController : ApiController
{
    public string[] includes = null;

    private readonly IFiltroServico servico;
    public BaseController(IFiltroServico _servico)
    {
        servico = _servico;
    }
}

public abstract class BaseController<E, R, F> : BaseController
        where E : class
        where R : class
        where F : class
    {
    private readonly IFiltroServico servico;
            public AreaFormacaoController(IFiltroServico _servico): base(_servico)
            {
                servico = _servico;
            }
}

public abstract class BaseController<R> : BaseController
            where R : class
        {
private readonly IFiltroServico servico;
        public AreaFormacaoController(IFiltroServico _servico): base(_servico)
        {
            servico = _servico;
        }
     //services of controller;
        }