转一位前辈的代码自己加了点注释,以备自己使用时查找,同时也希望能给需要的人一点帮助.

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

namespace TestCenter.XMLData
{
    /// <summary>
    /// XMLHandle XML操作。
    /// 示例:
    /// string strXmlFile = Server.MapPath("MyXML.xml");
    /// XMLHandle xmlHandle = new XmlControl(strXmlFile);    
    /// DataView dv=xmlHandle.GetData("BackAdmin/User/Name");
    /// 
    /// </summary>
    
    public class XMLHandle
    {
        protected string strXmlFile;//操纵的XML文档路径
        protected XmlDocument objXmlDoc = new XmlDocument();

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="XmlFile">XML文件的路径 初始化类时指定</param>
        public XMLHandle(string XmlFile)
        {
            try
            {
                objXmlDoc.Load(XmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            strXmlFile = XmlFile;
        }

        /// <summary>
        /// 查找指定节点的数据 返回DataView
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <returns>DataView</returns>
        public DataView GetData(string XmlPathNode)
        {            
            DataSet dst = new DataSet();
            StringReader read = new StringReader(objXmlDoc.SelectSingleNode(XmlPathNode).OuterXml);
            dst.ReadXml(read);
            return dst.Tables[0].DefaultView;
        }

        /// <summary>
        /// 更新指定节点的内容
        /// </summary>
        /// <param name="XmlPathNode">节点</param>
        /// <param name="Content">内容</param>
        public void Replace(string XmlPathNode,string Content)
        {           
            objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
        }

        /// <summary>
        /// 删除指定节点
        /// </summary>
        /// <param name="Node">节点</param>
        public void Delete(string Node)
        {            
            string mainNode = Node.Substring(0,Node.LastIndexOf("/"));
            objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
        }

        /// <summary>
        /// 插入一个节点和此节点的一子节点。
        /// </summary>
        /// <param name="MainNode">主节点</param>
        /// <param name="ChildNode">子节点</param>
        /// <param name="Element">元素名</param>
        /// <param name="Content">值</param>
        public void InsertNode(string MainNode,string ChildNode,string Element,string Content)
        {            
            XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
            objRootNode.AppendChild(objChildNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objChildNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入一节点 包括一个属性
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="Element"></param>
        /// <param name="Attrib"></param>
        /// <param name="AttribContent"></param>
        /// <param name="Content"></param>
        public void InsertElement(string MainNode,string Element,string Attrib,string AttribContent,string Content)
        {           
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.SetAttribute(Attrib,AttribContent);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入一节点不带属性
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="Element"></param>
        /// <param name="Content"></param>
        public void InsertElement(string MainNode,string Element,string Content)
        {           
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 保存文档
        /// </summary>
        public void Save()
        {            
            try
            {
                objXmlDoc.Save(strXmlFile);
            }
            catch (System.Exception ex)
            {
                throw new System.Exception(ex.ToString());
            }
            objXmlDoc = null;
        }
    }
}