如何取得XML节点的值

哈哈哈尔滨小子 2011-03-26 01:53:56

我得到了如下的字符串，它是以XML形式表现的。如何取得 retweeted_status 下的 text 的值呢？
-------------
<?xml version="1.0" encoding="UTF-8" ?>
- <statuses>
- <status>
<created_at>Fri Mar 25 16:46:11 +0800 2011</created_at>
<id>3444</id>
<text>文字文字......</text>
- <source>
<a href="http://1">uiououou</a>
</source>
<favorited>false</favorited>
<truncated>false</truncated>
<geo />
<in_reply_to_status_id />
<in_reply_to_user_id />
<in_reply_to_screen_name />
<mid>898989889</mid>
- <user>
<id>7777755</id>
<screen_name>yuiuiu</screen_name>
<name>无脚鸟v</name>
<province>44</province>
<city>3</city>
<location>iuouo</location>
<description>fhgfhhgfhgfh．．．．．</description>
<url>http://1</url>
<profile_image_url>http://1</profile_image_url>
<domain />
<gender>m</gender>
<followers_count>132</followers_count>
<friends_count>683</friends_count>
<statuses_count>388</statuses_count>
<favourites_count>0</favourites_count>
<created_at>Sat Oct 16 00:00:00 +0800 2010</created_at>
<following>false</following>
<verified>false</verified>
<allow_all_act_msg>false</allow_all_act_msg>
<geo_enabled>true</geo_enabled>
</user>
- <retweeted_status>
<created_at>Fri Mar 25 16:25:40 +0800 2011</created_at>
<id>8040898773</id>
<text>uuuuuuuuuuukljlklkj</text>
- <source>
<a href="http://1">sdgfdsfsdfd</a>
</source>
<favorited>false</favorited>
<truncated>false</truncated>
<geo />
<in_reply_to_status_id />
<in_reply_to_user_id />
<in_reply_to_screen_name />
<mid>6666666767</mid>
- <user>
<id>1645979402</id>
<screen_name>yutu</screen_name>
<name>tyuytu</name>
<province>31</province>
<city>15</city>
<location>上海浦东新区</location>
<description>gfhfhgfhfh</description>
<url>http://2</url>
<profile_image_url>http://1</profile_image_url>
<domain>ghfghgfh</domain>
<gender>m</gender>
<followers_count>15339</followers_count>
<friends_count>349</friends_count>
<statuses_count>4195</statuses_count>
<favourites_count>0</favourites_count>
<created_at>Fri Mar 26 00:00:00 +0800 2010</created_at>
<following>false</following>
<verified>true</verified>
<allow_all_act_msg>true</allow_all_act_msg>
<geo_enabled>true</geo_enabled>
</user>
- <annotations>
- <annotation class="object">
<cartoon type="boolean">false</cartoon>
</annotation>
</annotations>
</retweeted_status>
<annotations />
</status>
</statuses>

...全文

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子夜__ 2011-03-27

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你看看机器人给你给你回复。
LINQ2XML

ycproc 2011-03-27

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using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Xml;

private XmlDocument xmlDoc;



        //load xml file

        private void LoadXml()

        {

            xmlDoc=new XmlDocument();

            xmlDoc.Load(Server.MapPath("User.xml"));

        }





        //添加节点

        private void AddElement()

        {

            

            LoadXml();



            XmlNode xmldocSelect=xmlDoc.SelectSingleNode("user");

            

            XmlElement el=xmlDoc.CreateElement("person"); //添加person节点

            el.SetAttribute("name","风云"); //添加person节点的属性"name"

            el.SetAttribute("sex","女");   //添加person节点的属性 "sex"

            el.SetAttribute("age","25");   //添加person节点的属性 "age"

            

             XmlElement xesub1=xmlDoc.CreateElement("pass"); //添加person节点的里的节点

             xesub1.InnerText="123";//设置文本节点

             el.AppendChild(xesub1);

             XmlElement xesub2=xmlDoc.CreateElement("Address");

             xesub2.InnerText="昆明";//设置文本节点

             el.AppendChild(xesub2);



            xmldocSelect.AppendChild(el);

            xmlDoc.Save(Server.MapPath("user.xml"));





        }





        



        //修改节点

        private void UpdateElement()

        {

            LoadXml();

            XmlNodeList nodeList=xmlDoc.SelectSingleNode("user").ChildNodes;//获取bookstore节点的所有子节点

            foreach(XmlNode xn in nodeList)//遍历所有子节点

            {

                XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型

                if(xe.GetAttribute("name")=="风云")//如果name属性值为“风云”

                {

                    xe.SetAttribute("name","发明");



                    

                    //如果下面有子节点在下走

                     XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点

                    foreach(XmlNode xn1 in nls)//遍历

                    {

                       XmlElement xe2=(XmlElement)xn1;//转换类型

                        if(xe2.Name=="pass")//如果找到

                        {

                            xe2.InnerText="66666";//则修改

                            break;



                        }

                    }



                    break;

                }

            }

           xmlDoc.Save(Server.MapPath("user.xml"));//保存

        }





        //删出节点

        private void deleteNode()

        {

            

            LoadXml();

            XmlNodeList xnl=xmlDoc.SelectSingleNode("user").ChildNodes;

 

            foreach(XmlNode xn in xnl)

            {

                XmlElement xe=(XmlElement)xn;

                

                if(xe.GetAttribute("name")=="发明")

                {

                    //xe.RemoveAttribute("name");//删除name属性

                   // xe.RemoveAll();//删除该节点的全部内容

                    xe.ParentNode.RemoveChild(xe);

                    

                    break;

                }

                

            }

            xmlDoc.Save(Server.MapPath("user.xml"));//保存

        }



        private void showIt()

        {

            LoadXml();

            XmlNode xn=xmlDoc.SelectSingleNode("user");

 

            XmlNodeList xnl=xn.ChildNodes;

   

            foreach(XmlNode xnf in xnl)

            {

                XmlElement xe=(XmlElement)xnf;

//                Console.WriteLine(xe.GetAttribute("name"));//显示属性值

//                Console.WriteLine(xe.GetAttribute("sex"));

// 

//                XmlNodeList xnf1=xe.ChildNodes;

//                foreach(XmlNode xn2 in xnf1)

//                {

//                    Console.WriteLine(xn2.InnerText);//显示子节点点文本

//                }



            }



        }



<?xml version="1.0" encoding="gb2312"?>

<user>

  <person>

  </person>

  <person name="ss" sex="男" age="25">

    <pass>123</pass>

    <Address>a</Address>

  </person>

  <person name="ff" sex="女" age="25">

    <pass>123</pass>

    <Address>g</Address>

  </person>

</user>

KeepMoving 2011-03-27

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正则，或者XPATH

huangwenquan123 2011-03-26

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        XmlDocument xml = new XmlDocument();

        xml.Load(Server.MapPath("XMLFile.xml"));

        XmlNodeList node = xml.SelectNodes("//*/retweeted_status/text");

        foreach (XmlNode n in node)

        {

            Response.Write(n.InnerText);

        }

/*

uuuuuuuuuuukljlklkj 

*/

stepday 2011-03-26

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哈哈哈尔滨小子 2011-03-26

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"retweeted_status/text" 格式这样？

堆代码的爱因斯坦 2011-03-26

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那个node参数是什么？

是节点

哈哈哈尔滨小子 2011-03-26

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[Quote=引用 2 楼 wxr0323 的回复:]

XML操作类
C# code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.We……
[/Quote]

试过了，提示“System.NullReferenceException: 未将对象引用设置到对象的实例。”
那个node参数是什么？如果按我给出那些字符串？

subxli 2011-03-26

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XPATH 查询xml节点

子夜__ 2011-03-26

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XML操作类

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Xml;



namespace PuTianCheng

{

    /// <summary>

    /// XmlHelper 的摘要说明

    /// </summary>

    public class XmlHelper

    {

        public XmlHelper()

        {

        }



        /// <summary>

        /// 读取数据

        /// </summary>

        /// <param name="path">路径</param>

        /// <param name="node">节点</param>

        /// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param>

        /// <returns>string</returns>

        /**************************************************

         * 使用示列:

         * XmlHelper.Read(path, "/Node", "")

         * XmlHelper.Read(path, "/Node/Element[@Attribute='Name']", "Attribute")

         ************************************************/

        public static string Read(string path, string node, string attribute)

        {

            string value = "";

            try

            {

                XmlDocument doc = new XmlDocument();

                doc.Load(path);

                XmlNode xn = doc.SelectSingleNode(node);

                value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);

            }

            catch { }

            return value;

        }



        /// <summary>

        /// 插入数据

        /// </summary>

        /// <param name="path">路径</param>

        /// <param name="node">节点</param>

        /// <param name="element">元素名，非空时插入新元素，否则在该元素中插入属性</param>

        /// <param name="attribute">属性名，非空时插入该元素属性值，否则插入元素值</param>

        /// <param name="value">值</param>

        /// <returns></returns>

        /**************************************************

         * 使用示列:

         * XmlHelper.Insert(path, "/Node", "Element", "", "Value")

         * XmlHelper.Insert(path, "/Node", "Element", "Attribute", "Value")

         * XmlHelper.Insert(path, "/Node", "", "Attribute", "Value")

         ************************************************/

        public static void Insert(string path, string node, string element, string attribute, string value)

        {

            try

            {

                XmlDocument doc = new XmlDocument();

                doc.Load(path);

                XmlNode xn = doc.SelectSingleNode(node);

                if (element.Equals(""))

                {

                    if (!attribute.Equals(""))

                    {

                        XmlElement xe = (XmlElement)xn;

                        xe.SetAttribute(attribute, value);

                    }

                }

                else

                {

                    XmlElement xe = doc.CreateElement(element);

                    if (attribute.Equals(""))

                        xe.InnerText = value;

                    else

                        xe.SetAttribute(attribute, value);

                    xn.AppendChild(xe);

                }

                doc.Save(path);

            }

            catch { }

        }



        /// <summary>

        /// 修改数据

        /// </summary>

        /// <param name="path">路径</param>

        /// <param name="node">节点</param>

        /// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param>

        /// <param name="value">值</param>

        /// <returns></returns>

        /**************************************************

         * 使用示列:

         * XmlHelper.Insert(path, "/Node", "", "Value")

         * XmlHelper.Insert(path, "/Node", "Attribute", "Value")

         ************************************************/

        public static void Update(string path, string node, string attribute, string value)

        {

            try

            {

                XmlDocument doc = new XmlDocument();

                doc.Load(path);

                XmlNode xn = doc.SelectSingleNode(node);

                XmlElement xe = (XmlElement)xn;

                if (attribute.Equals(""))

                    xe.InnerText = value;

                else

                    xe.SetAttribute(attribute, value);

                doc.Save(path);

            }

            catch { }

        }



        /// <summary>

        /// 删除数据

        /// </summary>

        /// <param name="path">路径</param>

        /// <param name="node">节点</param>

        /// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param>

        /// <param name="value">值</param>

        /// <returns></returns>

        /**************************************************

         * 使用示列:

         * XmlHelper.Delete(path, "/Node", "")

         * XmlHelper.Delete(path, "/Node", "Attribute")

         ************************************************/

        public static void Delete(string path, string node, string attribute)

        {

            try

            {

                XmlDocument doc = new XmlDocument();

                doc.Load(path);

                XmlNode xn = doc.SelectSingleNode(node);

                XmlElement xe = (XmlElement)xn;

                if (attribute.Equals(""))

                    xn.ParentNode.RemoveChild(xn);

                else

                    xe.RemoveAttribute(attribute);

                doc.Save(path);

            }

            catch { }

        }

    }

}