xml写入

　　　　　　　　　　　　XmlDocument xmlDocument=new XmlDocument();
                    XmlElement root = xmlDocument.CreateElement("", "root", "");
                    xmlDocument.AppendChild(root);
                    XmlNode rootnode = xmlDocument.SelectSingleNode("root");
                    for (int i = 0; i < table.Rows.Count; i++)
                    {
                        XmlElement item = xmlDocument.CreateElement("item");
                        item.SetAttribute("number", table.Rows[i]["number"].ToString());
                        item.SetAttribute("name", table.Rows[i]["name"].ToString());
                        item.SetAttribute("specification", table.Rows[i]["specification"].ToString());
                        item.SetAttribute("comments", table.Rows[i]["comments"].ToString());
                        root.AppendChild(item);
                    }
                    string xmlstr = xmlDocument.InnerXml;