C# XML操作總結2 包括讀取、插入、修改、刪除

C#：XML操作總結2  包括讀取、插入、修改、刪除

1、讀取節點中某一個屬性的值

        /// <summary>        /// 讀取節點中某一個屬性的值。如果attribute為空白，則返回整個節點的InnerText，否則返回具體attribute的值        /// </summary>        /// <param name="path">xml檔案路徑</param>        /// <param name="node">節點</param>        /// <param name="attribute">節點中的屬性</param>        /// <returns>如果attribute為空白，則返回整個節點的InnerText，否則返回具體attribute的值</returns>        /// 使用執行個體: XMLHelper.Read(path, "PersonF/person[@Name='Person2']", "");        ///  XMLHelper.Read(path, "PersonF/person[@Name='Person2']", "Name");        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(Exception e)            {                Console.WriteLine(e.Message);            }            return value;        }

　2、　向節點中增加節點元素，屬性

        /// <summary>        /// 向節點中增加節點元素，屬性        /// </summary>        /// <param name="path">路徑</param>        /// <param name="node">要操作的節點</param>        /// <param name="element">要增加的節點元素，可空可不空。非空時插入新的元素，否則插入該元素的屬性</param>        /// <param name="attribute">要增加的節點屬性，可空可不空。非空時插入元素值，否則插入元素值</param>        /// <param name="value">要增加的節點值</param>        /// 使用執行個體：XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "ID", "88");        /// XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "", "88");        /// XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "", "ID", "88");        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);                //如果element，則增加該屬性                 if (string.IsNullOrEmpty(element))                {                    //如果attribute不為空白，增加該屬性                    if (!string.IsNullOrEmpty(attribute))                    {                                               XmlElement xe = (XmlElement)xn;                        // <person Name="Person2" ID="88"> XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "ID", "88");                        xe.SetAttribute(attribute, value);                    }                }                else //如果element不為空白，則preson下增加節點                   {                    XmlElement xe = doc.CreateElement(element);                    if (string.IsNullOrEmpty(attribute))                        // <person><Num>88</Num></person>  XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "", "88");                        xe.InnerText = value;                    else                        // <person> <Num ID="88" /></person>  XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "", "ID", "88");                        xe.SetAttribute(attribute, value);                    xn.AppendChild(xe);                }                doc.Save(path);            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }        }

　　3、修改節點值

        /// <summary>        /// 修改節點值        /// </summary>        /// <param name="path">路徑</param>        /// <param name="node">要修改的節點</param>        /// <param name="attribute">屬性名稱，非空時修改節點的屬性值，否則修改節點值</param>        /// <param name="value">屬性值</param>        /// 執行個體 XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "", "888");        /// XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "Num", "999");         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 (string.IsNullOrEmpty(attribute))                    xe.InnerText = value;//原<ID>2</ID> 改變:<ID>888</ID>  XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "", "888");                else                    xe.SetAttribute(attribute, value); //原<ID Num="3">888</ID> 改變<ID Num="999">888</ID>    XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "Num", "999");                 doc.Save(path);            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }        }

　　

 4、刪除資料

        /// <summary>        /// 刪除資料        /// </summary>        /// <param name="path">路徑</param>        /// <param name="node">要刪除的節點</param>        /// <param name="attribute">屬性，為空白則刪除整個節點，不為空白則刪除節點中的屬性</param>        /// 執行個體：XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "");        /// XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "Num");        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 (string.IsNullOrEmpty(attribute))                    xn.ParentNode.RemoveChild(xn);// <ID Num="999">888</ID>的整個節點將被移除  XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "");                else                    xe.RemoveAttribute(attribute);//<ID Num="999">888</ID> 變為<ID>888</ID> XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "Num");                doc.Save(path);            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }        }

　　

5、調用方法

      public static void XMLMTest()        {            string path = "http://www.cnblogs.com/../Person.xml";            XMLHelper.Read(path, "PersonF/person[@Name='Person2']", "Name");            XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "Num", "ID", "88");            XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "Num", "", "88");            XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "", "ID", "88");            XMLHelper.Update(path, "PersonF/person[@Name='Person3']", "Num", "888");            XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "Num", "999");            XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "", "888");            XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "Num");            XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "");        }

　　

6、XML檔案

<?xml version="1.0" encoding="utf-8"?><PersonF xmlns="" Name="work hard work smart!">  <person Name="Person1">    <ID>1</ID>    <Name>XiaoA</Name>    <Age>59</Age>  </person>  <person Name="Person2" ID="88">    <ID>2</ID>    <Name>XiaoB</Name>    <Age>29</Age>    <Num ID="88" />    <Num>88</Num>  </person>  <person Name="Person3">    <ID Num="999">888</ID>    <Name>XiaoC</Name>    <Age>103</Age>  </person>  <person Name="Person4">    <ID>4</ID>    <Name>XiaoD</Name>    <Age>59</Age>  </person>  <person Name="Person5">    <Name>work hard work smart!</Name>    <ID>32</ID>  </person>  <person Name="Person5">    <Name>work hard work smart!</Name>    <ID>32</ID>  </person></PersonF>

　

下文是對C#對XML的具體操作總結1

C# XML操作總結2  包括讀取、插入、修改、刪除

如何完成.Net下XML文檔的讀寫操作

C#操作xml SelectNodes,SelectSingleNode總是返回NULL 與 xPath 介紹

C#中用SelectSingleNode方法解析帶有多個命名空間的XML檔案