刪除列表中附件內容

刪除網站中列表裡的附件內容   

     private static void DelectAttachmentAll()
        {
            SPSite site = new SPSite(siteUrl);
            SPWeb web = site.OpenWeb();
            try
            {
                SPList list = web.Lists[listname];
                for (int i = 0; i < list.ItemCount; i++)
                {
                    SPListItem item = list.Items[i];
                    if (item.Attachments != null)
                    {
                        SPAttachmentCollection att = item.Attachments;
                        for (int j = 0; j < att.Count; j++)
                        {
                            try
                            {
                                att.Delete(att[j]);
                            }
                            catch (Exception ex)
                            { }
                        }
                        item.Update();
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
            }
            finally
            {
                web.Close();
                web.Dispose();
                site.Dispose();
            }
        }