public void associateEntrainementChevalEmploye(int Id_entrainement, int Id_cheval, int id_employe) { Pece pece = new Pece() { Id_Entrainement = Id_entrainement, Id_Cheval = Id_cheval, Id_Employe = id_employe }; if (!(entrainementrepository.GetById(pece.Id_Entrainement) is null) && !(chevalrepository.GetById(pece.Id_Cheval) is null) && !(employerepository.GetById(pece.Id_Employe) is null)) { peceRepository.Create(pece); } }