XML初探

Xml

容易读懂;格式标准;任何语言都内置XML引擎,不用单独进行文件分析引擎的编写;跨系统传送数据

语法

标签(Tag)、嵌套(Nest)、属性。标签要闭合,属性值要用""包围,标签可以互相嵌套

区分大小写

XML树 ,父节点,节点、兄弟节点

必须要有结束标签,元素属性必须用引号

1  创建

XmlDocument doc=new XmlDocument();

保存

doc.Save("D:\\1.xml");

static void Main(string[] args)

        {

            XmlDocument doc = new XmlDocument();

            //创建文档声明节点

            XmlDeclaration xmldec= doc.CreateXmlDeclaration("1.0", "utf-8", null);

            doc.AppendChild(xmldec);

            //创建根节点

            XmlElement xmlele = doc.CreateElement("New");

            doc.AppendChild(xmlele);



            XmlElement xmlTitle = doc.CreateElement("Title");

            xmlele.AppendChild(xmlTitle);

            xmlTitle.InnerText = "收回钓鱼岛";



            XmlElement xmlContent = doc.CreateElement("Content");

            xmlele.AppendChild(xmlContent);

            xmlContent.InnerText = "日本沉没";



            doc.Save("D:\\New.xml");

        }

New.xml内容如下

<?xml version="1.0" encoding="utf-8"?>

<New>

  <Title>收回钓鱼岛</Title>

  <Content>日本沉没</Content>

</New>

 

innerText与innerXml

类似于js中的innerText与innerHtml 对<>等字符的转换

 

2   更新XML内容 首先判断xml文件是否存在,存在的话追加内容

string path = "D:\\New.xml";

            XmlDocument doc = new XmlDocument();

            if (!System.IO.File.Exists(path))

            {

                #region 创建XML

                XmlDeclaration xmldec = doc.CreateXmlDeclaration("1.0", "utf-8", null);

                doc.AppendChild(xmldec);

                //创建根节点

                XmlElement parent = doc.CreateElement("News");

                doc.AppendChild(parent);



                XmlElement san = doc.CreateElement("New");

                parent.AppendChild(san);

                XmlElement xmlTitle = doc.CreateElement("Title");

                san.AppendChild(xmlTitle);

                xmlTitle.InnerText = "收回钓鱼岛";



                XmlElement xmlContent = doc.CreateElement("Content");

                san.AppendChild(xmlContent);

                xmlContent.InnerText = "日本沉没111";

                #endregion

            }

            else

            {

                //加载已经存在的xml文件

                doc.Load(path);

                //获取New根节点 

               XmlElement parent= doc.DocumentElement;



               XmlElement san = doc.CreateElement("New");

               parent.AppendChild(san);

               #region XML更新(实际使用中可定义方法调用)

               XmlElement xmlTitle = doc.CreateElement("Title");

               san.AppendChild(xmlTitle);

               xmlTitle.InnerText = "新医改";



               XmlElement xmlContent = doc.CreateElement("Content");

               san.AppendChild(xmlContent);

               xmlContent.InnerText = "国家承担90%医药费"; 

               #endregion

            }

            doc.Save("D:\\New.xml");

结果:

<?xml version="1.0" encoding="utf-8"?>

<New>

  <Title>收回钓鱼岛</Title>

  <Content>日本沉没</Content>

  <Title>新医改</Title>

  <Content>国家承担90%医药费</Content>

</New>

创建带属性的XML节点

#region 创建xml的属性节点

            //创建xml的属性节点

            XmlDocument Sxjd = new XmlDocument();

            XmlDeclaration dec = Sxjd.CreateXmlDeclaration("1.0", "utf-8", null);

            Sxjd.AppendChild(dec);

            //根节点

            XmlElement xmlRoot = Sxjd.CreateElement("Order");

            Sxjd.AppendChild(xmlRoot);



            XmlElement xml1 = Sxjd.CreateElement("CustomerName");

            xml1.InnerText = "购物车";

            xmlRoot.AppendChild(xml1);



            XmlElement xml2 = Sxjd.CreateElement("OrderNumber");

            xml2.InnerText = "od00001";

            xmlRoot.AppendChild(xml2);



            //创建Items

            XmlElement items = Sxjd.CreateElement("Items");

            xmlRoot.AppendChild(items);



            XmlElement orderItems1 = Sxjd.CreateElement("OrderItem");

            items.AppendChild(orderItems1);

            orderItems1.SetAttribute("Name", "电脑");

            orderItems1.SetAttribute("count", "30");

            items.AppendChild(orderItems1);



            XmlElement orderItems2 = Sxjd.CreateElement("OrderItem");

            items.AppendChild(orderItems2);

            orderItems2.SetAttribute("Name", "U盘");

            orderItems2.SetAttribute("count", "2");

            items.AppendChild(orderItems2);



            Sxjd.Save("d:\\order.xml"); 

            #endregion

结果:

<?xml version="1.0" encoding="utf-8"?>

<Order>

  <CustomerName>购物车</CustomerName>

  <OrderNumber>od00001</OrderNumber>

  <Items>

    <OrderItem Name="电脑" count="30" />

    <OrderItem Name="U盘" count="2" />

  </Items>

</Order>

读取XML文件

string paths = "D:\\New.xml";

            XmlDocument docu = new XmlDocument();

            docu.Load(paths);



            XmlNode parents = docu.DocumentElement;

            XmlNodeList xnl = parents.ChildNodes;

            foreach (XmlNode node in xnl)

            {

                Console.WriteLine(node.ChildNodes[0].InnerText);

                Console.WriteLine(node.ChildNodes[1].InnerText);

            }

            Console.Read();

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