public I Enumerable<T> ExecWithStoreProcedure(string query, params object[] parameters)
    {
            return _co ntext.Database.SqlQuery<T>(query, parameters);
    }
And then you can call it with the unitofwork/repository like

    I Enumerable<Products> products = 
                 _unitOfWork.ProductRepository.ExecWithStoreProcedu re(
                 "spGetProducts @ bigCategoryId",
                 new SqlPara meter("bigCategoryId", SqlDbType.BigInt) { Value = categoryId } 
          );