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
        }