xml

创建XML

            //创建XmlDocument对象
            XmlDocument xmlDoc = new XmlDocument();
            //XML的声明 <?xml version="1.0" encoding="gb2312"?> 
            XmlDeclaration desc = XmlDoc.CreateXmlDeclaration("1.0","utf-8","");
            //追加xml的位置
            XmlDoc.AppendChild(desc);
            //添加根节点
            XmlElement xmlelement = XmlDoc.CreateElement("","Gen","");
            XmlDoc.AppendChild(xmlelement);
            XmlNode node = XmlDoc.SelectSingleNode("Gen");
            XmlElement son = XmlDoc.CreateElement("son");
            son.SetAttribute("name","xue");
            son.SetAttribute("age","25");
            XmlElement element = XmlDoc.CreateElement("title");
            element.InnerText = "c#";
            son.AppendChild(element);//添加子节点到第一个子节点
            node.AppendChild(son);//添加子节点到根节点
            XmlDoc.Save("D:/data.xml");

修改xml文件里面已经有了描述和根节点

            //创建xml的根节点
            XmlDoc.Load(path);
            XmlNode node = XmlDoc.SelectSingleNode("config/"+key);//查找文件里面的要修改的节点
            if (node == null)
            {
                XmlElement t = XmlDoc.CreateElement(key);
                t.InnerText = value;
                XmlDoc.SelectSingleNode("config").AppendChild(t);
            }
            else
            {
                node.InnerText = value;
            }
             XmlDoc.Save(path);