SharePoint删除图片库文件

 SPSecurity.RunWithElevatedPrivileges(delegate()
                       {
                           using (SPSite site = new SPSite(SPContext.Current.Site.ID))
                           {
                               using (SPWeb oweb = site.AllWebs[SPContext.Current.Web.ID])
                               {
                                   oweb.AllowUnsafeUpdates = true;
                                   SPList list = oweb.Lists.TryGetList("图像"); 
                                   if (list != null)
                                   {
                                       SPFolder folder = list.RootFolder;
                                       folder.Files.Delete(urlFile);//urlFile是ServerRelativeUrl
                                   }
                                   oweb.AllowUnsafeUpdates = true;
                               }
                           }
                       });