实用的xml操作类

using System;
using System.Xml;
using System.IO;
using System.Data;

namespace EmanUtils
{
    /**//// <summary>
    /// XmlHelper 的摘要说明。
    /// xml操作类
    /// </summary>
    public class XmlHelper
    {
        protected string strXmlFile;
        protected XmlDocument objXmlDoc = new XmlDocument();

        public XmlHelper(string XmlFile)
        {
            //
            // TODO: 在这里加入建构函式的程序代码
            //
            try
            {
                objXmlDoc.Load(XmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            strXmlFile = XmlFile;
        }

        public DataView GetData(string XmlPathNode)
        {
            //查找数据。返回一个DataView
            DataSet ds = new DataSet();
            StringReader read = new StringReader(objXmlDoc.SelectSingleNode(XmlPathNode).OuterXml);
            ds.ReadXml(read);
            return ds.Tables[0].DefaultView;
        }

        public void Replace(string XmlPathNode,string Content)
        {
            //更新节点内容。
            objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
        }

        public void Delete(string Node)
        {
            //删除一个节点。
            string mainNode = Node.Substring(0,Node.LastIndexOf("/"));
            objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
        }

        public void InsertNode(string MainNode,string ChildNode,string Element,string Content)
        {
            //插入一节点和此节点的一子节点。
            XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
            objRootNode.AppendChild(objChildNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objChildNode.AppendChild(objElement);
        }

        public void InsertElement(string MainNode,string Element,string Attrib,string AttribContent,string Content)
        {
            //插入一个节点，带一属性。
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.SetAttribute(Attrib,AttribContent);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        public void InsertElement(string MainNode,string Element,string Content)
        {
            //插入一个节点，不带属性。
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        public void Save()
        {
            //保存文檔。
            try
            {
                objXmlDoc.Save(strXmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            objXmlDoc = null;
        }
    }

    //=========================================================

    //实例应用：

    //string strXmlFile = Server.MapPath("TestXml.xml");
    //XmlControl xmlTool = new XmlControl(strXmlFile);

    // 数据显视
    // dgList.DataSource = xmlTool.GetData("Book/Authors[ISBN=\"0002\"]");
    // dgList.DataBind();

    // 更新元素内容
    // xmlTool.Replace("Book/Authors[ISBN=\"0002\"]/Content","ppppppp");
    // xmlTool.Save();

    // 添加一个新节点
    // xmlTool.InsertNode("Book","Author","ISBN","0004");
    // xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Content","aaaaaaaaa");
    // xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Title","Sex","man","iiiiiiii");
    // xmlTool.Save();

    // 删除一个指定节点的所有内容和属性
    // xmlTool.Delete("Book/Author[ISBN=\"0004\"]");
    // xmlTool.Save();

    // 删除一个指定节点的子节点
    // xmlTool.Delete("Book/Authors[ISBN=\"0003\"]");
    // xmlTool.Save();

}