معادل کد زیر در mvc.core چیست

items.InputStream.Read(Attach.Attached, 0, items.ContentLength);

foreach (var items in file)
                        {
                            var Attach = new Add
                            {
                                DocumentationAttachId = Guid.NewGuid(),
                                DocumentationId = newGuId,
                                FileName = items.FileName,
                                ContentType = items.ContentType,
                                FileLength = items.ContentLength,
                                Attached = new byte[items.ContentLength],
                            };
                            items.InputStream.Read(Attach.Attached, 0, items.ContentLength);
                            db.AttachRepository.Add(AttachMapper.Attach(Attach  ));
                            db.Complete();
                        }