C#对一个XML操作的实用类

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

namespace eBlog.Common.Files
{
    public class XmlHelper
    {
        protected string strXmlFile;
        protected XmlDocument objXmlDoc = new XmlDocument();

        /// <summary>
        /// 初始化xml操作类,XmlFile需要绝对路径Server.MapPath(),若文件不存在自动创建
        /// </summary>
        /// <param name="XmlFile"></param>
        public XmlHelper(string XmlFile)
        {
            try
            {
                if (!File.Exists(XmlFile))
                {
                    CreatXmlFile(XmlFile);

                }
                objXmlDoc.Load(XmlFile);

            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            strXmlFile = XmlFile;
        }


        public void CreatXmlFile(string file)
        {
            XmlTextWriter writer = new
            XmlTextWriter(file, Encoding.UTF8);
            // start writing!
            writer.WriteStartDocument();
            writer.WriteStartElement("Root");
            writer.WriteEndElement();
            writer.WriteEndDocument();
            writer.Close();
        }

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


        /// <summary>
        /// 更新节点内容
        /// </summary>
        /// <param name="xmlPathNode"></param>
        /// <param name="content"></param>
        public void Replace(string xmlPathNode, string content)
        {
            //更新节点内容。 
            // ReSharper disable PossibleNullReferenceException
            if (xmlPathNode != null) objXmlDoc.SelectSingleNode(xmlPathNode).InnerText = content;
            // ReSharper restore PossibleNullReferenceException
        }

        /// <summary>
        /// 删除一个节点
        /// </summary>
        /// <param name="node"></param>
        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));
        }
        /// <summary>
        /// 插入一个节点和此节点的一子节点
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="ChildNode"></param>
        /// <param name="Element"></param>
        /// <param name="Content"></param>
        public void InsertNode(string MainNode, string ChildNode, string Element, string Content)
        {
            //插入一个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);
        }
        /// <summary>
        /// 插入一个节点,带一属性
        /// </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)
        {
            //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);
        }
        /// <summary>
        /// 插入一个节点,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);
        }




        #region xml操作 静态方法组=============
        /// <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)
        {
            if (path != "" && path.IndexOf(":") < 0) { path = System.Web.HttpContext.Current.Server.MapPath(path); }

            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 { }
        }

        #endregion ==========
    }

}