SharePoint 批量删除SPListitem

用item.Delete 来删除 ，如果行数在10多行的时候，删除所需要的时间会达到好几1-2秒，所以非常之慢！一般来说，当行数多的时候会采取以下的方法来删除

public void DeleteData(SPListItemCollection items, SPList itemlist)
        {
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                using (SPSite site = new SPSite(itemlist.ParentWeb.Site.Url))
                {
                    SPWeb web = site.OpenWeb(itemlist.ParentWeb.ID);
                    SPList list = web.Lists[itemlist.ID];

                    StringBuilder sbDelete = new StringBuilder();
                    sbDelete.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><Batch>");
                    foreach (SPListItem item in items)
                    {
                        sbDelete.Append("<Method>");
                        sbDelete.Append("<SetList Scope=\"Request\">" + list.ID + "</SetList>");
                        sbDelete.Append("<SetVar Name=\"ID\">" + Convert.ToString(item.ID) + "</SetVar>");
                        sbDelete.Append("<SetVar Name=\"Cmd\">Delete</SetVar>");
                        sbDelete.Append("</Method>");
                    }
                    sbDelete.Append("</Batch>");
                    web.ProcessBatchData(sbDelete.ToString());
                }
            });
        }