Sharepoint 列表中 附件文件获取

Sharepoint 列表中 附件文件获取
SPSite site=new SPSite(url);

SPWeb web=site.OpenWeb();

   SPList olist = web.Lists["最新通知"];

SPList nlist= web.Lists["最新通知New"];
                SPListItem nitem = null;
                foreach (SPListItem oitem in olist.Items)
                {
                    string title = oitem["标题"].ToString();

                         nitem = nlist.Items.Add();   //将附件内容存储到最新通知New中
                         nitem["标题"] = oitem["标题"];
                        nitem["正文"] = oitem["正文"];

                        if (oitem.Attachments != null)
                        {

                            SPAttachmentCollection attach = oitem.Attachments;
                            for (int i = 0; i < attach.Count; i++)
                            {
                                String url = attach.UrlPrefix + attach[i];
                                Console.WriteLine("正在下载{0}", url);
                                SPFile file = web.GetFile(url);
                                byte[] content = file.OpenBinary();
                                nitem.Attachments.Add(oitem.Attachments[i].ToString(), content);
                            }

                        }
                        nitem.Update();

                 }