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();

}