仿Jquery链式操作的xml操作类

经常需要对xml文件进行操作，参考了Jquery的链式操作后实现了xmlHelper类。

using System;
using System.Data;
using System.Configuration;
using System.Xml;
namespace ConfigUpdate
{
    /// <summary>
    /// 调用非静态的操作方法的
    /// </summary>
    public class XmlHelper
    {
        private XmlDocument _doc;
        private string _xmlPath;
        public XmlHelper(string xmlPath)
        {
            _xmlPath = xmlPath;
            _doc = new XmlDocument();
            _doc.Load(xmlPath);
        }

        /// <summary>
        /// 读取数据
        /// </summary>
        /// <param name="xmlPath">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>
        public static string Select(string xmlPath, string node, string attribute)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlPath);
            XmlNode xn = GetNode(doc, node);
            string value = (String.IsNullOrEmpty(attribute) ? xn.InnerText : xn.Attributes[attribute].Value);
            doc.Clone();
            return value;
        }

        /// <summary>
        /// 调用此方法后不再需要调用Execute方法。
        /// </summary>
        /// <param name="node"></param>
        /// <param name="attribute"></param>
        /// <returns></returns>
        public string Select(string node, string attribute)
        {
            string value = String.Empty; ;
            XmlNode xn = GetNode(_doc, node);
            value = (String.IsNullOrEmpty(attribute) ? xn.InnerText : xn.Attributes[attribute].Value);
            return value;
        }

        /// <summary>
        /// 插入数据
        /// </summary>
        /// <param name="xmlPath">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>
        public XmlHelper Insert(string node, string element, string attribute, string value)
        {
            Add(_doc, _xmlPath, node, element, attribute, value);
            return this;
        }

        public static void Insert(string xmlPath, string node, string element, string attribute, string value)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlPath);
            Add(doc, xmlPath, node, element, attribute, value);
        }

        private static void Add(XmlDocument doc, string xmlPath, string node, string element, string attribute, string value)
        {
            XmlNode xn = GetNode(doc, node);
            if (String.IsNullOrEmpty(element))
            {
                if (!String.IsNullOrEmpty(attribute))
                {
                    XmlElement xe = (XmlElement)xn;
                    xe.SetAttribute(attribute, value);
                }
            }
            else
            {
                XmlElement xe = doc.CreateElement(element);
                if (String.IsNullOrEmpty(attribute))
                    xe.InnerText = value;
                else
                    xe.SetAttribute(attribute, value);
                xn.AppendChild(xe);
            }
            doc.Save(xmlPath);
        }

        /// <summary>
        /// 修改数据
        /// </summary>
        /// <param name="xmlPath">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>
        public static void Update(string xmlPath, string node, string attribute, string value)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlPath);
            Edit(doc, xmlPath, node, attribute, value);
        }

        /// <summary>
        /// 插入一个节点或者属性
        /// </summary>
        /// <param name="node"></param>
        /// <param name="attribute"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public XmlHelper Update(string node, string attribute, string value)
        {
            Edit(_doc, _xmlPath, node, attribute, value);
            return this;
        }

        private static void Edit(XmlDocument doc, string xmlPath, string node, string attribute, string value)
        {
            XmlNode xn = GetNode(doc, node);
            XmlElement xe = (XmlElement)xn;
            if (String.IsNullOrEmpty(attribute))
            {
                xe.InnerText = value;
            }
            else
            {
                xe.SetAttribute(attribute, value);
            }
            doc.Save(xmlPath);
        }
       
        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="xmlPath">路径</param>
        /// <param name="node">节点如果是非根节点可使用多层节点表达式：nodelayer1>nodelayer2>nodelayer3</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>
        public static void Remove(string xmlPath, string node, string attribute)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlPath);
            Delete(doc, xmlPath, node, attribute);
        }

        public XmlHelper Delete(string node, string attribute)
        {
            Delete(_doc, _xmlPath, node, attribute);
            return this;
        }

        private static void Delete(XmlDocument doc, string xmlPath, string node, string attribute)
        {
            XmlNode xn = GetNode(doc, node);
            XmlElement xe = (XmlElement)xn;
            if (String.IsNullOrEmpty(attribute))
            {
                xn.ParentNode.RemoveChild(xn);
            }
            else
            {
                xe.RemoveAttribute(attribute);
            }
            doc.Save(xmlPath);
        }
        /// <summary>
        /// 返回节点
        /// </summary>
        /// <param name="doc"></param>
        /// <param name="node">节点表达式</param>
        /// <returns></returns>
        private static XmlNode GetNode(XmlDocument doc, string node)
        {
            if (String.IsNullOrEmpty(node))
            {
                throw new ArgumentNullException("节点不能为空");
            }
            string[] nodelayers = node.Split('>');
            XmlNode xn = doc.SelectSingleNode(nodelayers[0]);
            for (int i = 1; i < nodelayers.Length; i++)
            {
                if (String.IsNullOrEmpty(nodelayers[i]))
                {
                    throw new ArgumentException(String.Format("第{0}级节点为空",i+1));
                }
                else
                {
                    xn = xn.SelectSingleNode(nodelayers[i]);
                }
            }
            return xn;
        }
    }
}

 

 使用示例：

string _configPath = "config.xml";
           XmlHelper.Insert(_configPath, "configuration","mynode",null,"kk");
 
           string msg= new XmlHelper(_configPath)
               .Insert("configuration", "mynode", null, "kk")
               .Update("configuration>mynode", null, "zhao")
               .Select("configuration>mynode", null);
           MessageBox.Show(msg);
   

 

 xml内容

 <?xml version="1.0" encoding="utf-8"?>

<configuration>
</configuration>