[求教]xml上添加节点

Question

  我想请问下，
　
　在节点后面添加兄弟结点，要怎么弄．如果图中所示．．我想在标记的下面新增一节点，标记的节点我可以获取到
　
　　 XmlNodeList nodelist = xmlDoc.SelectSingleNode("root").ChildNodes;
        XmlElement xe = xmlDoc.CreateElement("img");
        xe.SetAttribute("id", nid.ToString());
        xe.SetAttribute("dir_1","背景");
        xe.SetAttribute("dir_2","社会景");
        xe.SetAttribute("sexFlg","2");        foreach(XmlNode xn in nodelist)
        {
            XmlElement xele = (XmlElement)xn;
            string cid = xele.Attributes["id"].InnerText.ToString();
            if (cid.Equals(id))//这里的id=210009
            {
                xn.InsertAfter(xe,xele);//这里报错
            }
        
        }
　

Answer 1

XmlNode node = xmlDoc.SelectSingleNode("root/img[@id='210009
']");//直接选择到你需要的XmlNode
XmlElement xe = xmlDoc.CreateElement("img");
xe.SetAttribute("id", nid.ToString());
xe.SetAttribute("dir_1","背景");
xe.SetAttribute("dir_2","社会景");
xe.SetAttribute("sexFlg","2");node.ParentNode.InsertAfter(xe, node);

Answer 2

       public static void Insert(string path, string node, string element, string attribute, string value)
        {
            try
            {
                XmlElement element2;
                XmlDocument document = new XmlDocument();
                document.Load(path);
                XmlNode node2 = document.SelectSingleNode(node);
                if (element.Equals(""))
                {
                    if (!attribute.Equals(""))
                    {
                        element2 = (XmlElement) node2;
                        element2.SetAttribute(attribute, value);
                    }
                }
                else
                {
                    element2 = document.CreateElement(element);
                    if (attribute.Equals(""))
                    {
                        element2.InnerText = value;
                    }
                    else
                    {
                        element2.SetAttribute(attribute, value);
                    }
                    node2.AppendChild(element2);
                }
                document.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch
            {
            }
        }

Answer 3

            DataSet ds = new DataSet();
            ds.ReadXml("1.xml");
            ds.Tables[0].Rows.Add(new object[] {"4","asdf","ddd","eee" });
            ds.Tables[0].DefaultView.Sort ="id asc";
            DataTable dtTemp = ds.Tables[0].DefaultView.ToTable();
            ds.Tables.Remove(ds.Tables[0]);
            ds.Tables.Add(dtTemp);
            ds.WriteXml("3.xml");这样如何