private IEnumerable <ODataEntityDto> SerializeEntities( IBindableModelContext context, IEnumerable <IEntity> entities, IEntityType entityType, SelectExpandClause selectExpandClause) { foreach (var entity in entities) { var dtoBuilder = this.dtoBuilderFactory.Create(entityType); if (selectExpandClause == null || selectExpandClause.AllSelected) { SelectAllProperties(dtoBuilder, entity); } else { var selectItemHandler = new DefaultSelectItemHandler(this.entityReader, context, entity, dtoBuilder, SelectAllProperties); selectItemHandler.HandleAll(selectExpandClause.SelectedItems); } yield return(dtoBuilder.DtoUnderConstruction); } }