XMLHelper 类

开面见山吧！我也就不废话了！不喜勿喷哈！！！！

新建一个Class（我这里是“XMLHelp”）
引入命名空间
using System.Xml;

    class XMLHelp

    {

        public static XmlDocument xdoc;//xml对象

        public static XmlNode xnode;//xml中的节点

        public static XmlElement xelement;//xml中的元素

        public static string path;

        //默认的构造函数

        public XMLHelp() { }

        /// <summary>

        /// 加载xml文件

        /// </summary>

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

        public static void LoadXml(string path)

        {

            xdoc = new XmlDocument();

            xdoc.Load(path);

        }

        /// <summary>

        /// 保存xml文件

        /// </summary>

        public static void SavedXml(string path)

        {

            xdoc.Save(path);

        }

        /// <summary>

        /// 读取数据

        /// </summary>

        /// <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>返回值</returns>

        public static string Read(string node,string attribute) 

        {

            LoadXml(path);

            string value = "";

            try 

            {

                xnode = xdoc.SelectSingleNode(node);

                value = (attribute.Equals("") ? xnode.InnerText : xnode.Attributes[attribute].Value);//？：三元运算符

            }catch 

            {

                throw;

            }

        return value;

        }

        /// <summary>

        /// 插入数据

        /// </summary>

        /// <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">插入值</param>

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

        {

            try 

            {

                LoadXml(path);

                xnode = xdoc.SelectSingleNode(node);

                //如果元素为空，属性不为空，则赋予属性值

                if (element.Equals(""))

                {

                    if (!attribute.Equals(""))

                    {

                        xelement = (XmlElement)xnode;

                        xelement.SetAttribute(attribute, value);

                    }

                }

                else 

                {

                    xelement = xdoc.CreateElement(element);

                    //属性为空，创建一个元素并赋与值,属性不为空，则赋予属性值

                    if (attribute.Equals(""))

                    {

                        xelement.InnerText = value;

                    }

                    else 

                    {

                        xelement.SetAttribute(attribute, value);

                        

                    }

                    xnode.AppendChild(xelement);

                }

                SavedXml(path);

            }catch 

            {

                throw;

            }

        }

        /// <summary>

        /// 修改数据

        /// </summary>

        /// <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">新值</param>

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

        {

            try

            {

                LoadXml(path);

                xnode = xdoc.SelectSingleNode(node);

                xelement = (XmlElement)xnode;

                if (attribute.Equals(""))

                {

                    xelement.InnerText = value;

                }

                else

                {

                    xelement.SetAttribute(attribute, value);

                }

                SavedXml(path);

            }catch

            {

                throw;

            }

        }

        /// <summary>

        /// 删除数据

        /// </summary>

        /// <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>

        public static void Delete(string node, string attribute)

        {

            try

            {

                LoadXml(path);

                xnode = xdoc.SelectSingleNode(node);

                xelement = (XmlElement)xnode;

                if (attribute.Equals(""))

                    xnode.ParentNode.RemoveChild(xnode);

                else

                    xelement.RemoveAttribute(attribute);

                SavedXml(path);

            }catch 

            {

                throw;

            }

        }

    }
******************************************************************************************************
以下是这个XMLHelp的使用方法（代码已经实例测试可行）

static void Main(string[] args)

        {

            // 给出xml的路径

            string path = "../../XMLFile/XMLFile1.xml";

            XMLHelp.path = path;

            /**

            * 插入

            */

            // XMLHelp.Insert("/Root", "student", "", "");//插入名为“student”的元素没有属性和值

            // XMLHelp.Insert("/Root", "student", "Name", "coolfei");//插入元素/属性为“Name”属性值为“coolfei”

            // XMLHelp.Insert("/Root/student", "name", "", "coolfei");//插入元素为“name”值为“coolfei”

            /**

             * 修改

            */

           // XMLHelp.Update("/Root/student", "Name", "cool");//修改Name属性的值为“cool”

           // XMLHelp.Update("/Root/student/name", "", "cool");//修改元素的值为“cool”

            /**

             * 查询

             */

            // string str1 = XMLHelp.Read("/Root/student", "");//读取一节点下所有的值

            // string str2 = XMLHelp.Read("/Root/student", "Name");//读取一节中名为“Name”的属性值

            /**

            * 删除

            */

            // XMLHelp.Delete("/Root/student", "Name");//删除名为“Name”属性

            // XMLHelp.Delete("/Root/student/name", "");//删除名为“name”的元素

        }