LINQ批量删除符合条件的数据

批量处理数据的方法：

CCPressDataContext cp = new CCPressDataContext();

IQueryable<BookInfoMaterial> aa =  from a in cp.BookInfoMaterial

                                     where a.AuthorName.Contains("aa")

                                     select a;

cp.BookInfoMaterial.DeleteAllOnSubmit(aa);

cp.SubmitChanges();