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

namespace demo.ClassHelper.XML
{
    class XmlHelper
    {
        #region 构造函数
        public XmlHelper()
        { }

        public XmlHelper(string strPath)
        {
            this._XMLPath = strPath;
        }
        #endregion

        #region 公有属性
        private string _XMLPath;
        public string XMLPath
        {
            get { return this._XMLPath; }
        }
        #endregion

        #region 私有方法
        /// <summary>
        /// 导入XML文件
        /// </summary>
        /// <param name="XMLPath">XML文件路径</param>
        private XmlDocument XMLLoad()
        {
            string XMLFile = XMLPath;
            XmlDocument xmldoc = new XmlDocument();
            try
            {
                string filename = AppDomain.CurrentDomain.BaseDirectory.ToString() + XMLFile;
                if (File.Exists(filename)) xmldoc.Load(filename);
            }
            catch 
            { }
            return xmldoc;
        }

        /// <summary>
        /// 导入XML文件
        /// </summary>
        /// <param name="XMLPath">XML文件路径</param>
        private static XmlDocument XMLLoad(string strPath)
        {
            XmlDocument xmldoc = new XmlDocument();
            try
            {
                string filename = AppDomain.CurrentDomain.BaseDirectory.ToString() + strPath;
                if (File.Exists(filename)) xmldoc.Load(filename);
            }
            catch 
            { }
            return xmldoc;
        }

        /// <summary>
        /// 返回完整路径
        /// </summary>
        /// <param name="strPath">Xml的路径</param>
        //private static string GetXmlFullPath(string strPath)
        //{
        //    if (strPath.IndexOf(":") > 0)
        //    {
        //        return strPath;
        //    }
        //    else
        //    {
        //        return System.Web.HttpContext.Current.Server.MapPath(strPath);
        //    }
        //}
        #endregion

        #region 读取数据
        /// <summary>
        /// 读取指定节点的数据
        /// </summary>
        /// <param name="node">节点</param>
        /// 使用示列:
        /// XMLProsess.Read("/Node", "")
        /// XMLProsess.Read("/Node/Element[@Attribute='Name']")
        public string Read(string node)
        {
            string value = "";
            try
            {
                XmlDocument doc = XMLLoad();
                XmlNode xn = doc.SelectSingleNode(node);
                value = xn.InnerText;
            }
            catch { }
            return value;
        }

        /// <summary>
        /// 读取指定路径和节点的串联值
        /// </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>
        /// 使用示列:
        /// XMLProsess.Read(path, "/Node", "")
        /// XMLProsess.Read(path, "/Node/Element[@Attribute='Name']")
        public static string Read(string path, string node)
        {
            string value = "";
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                value = xn.InnerText;
            }
            catch { }
            return value;
        }

        /// <summary>
        /// 读取指定路径和节点的属性值
        /// </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>
        /// 使用示列:
        /// XMLProsess.Read(path, "/Node", "")
        /// XMLProsess.Read(path, "/Node/Element[@Attribute='Name']", "Attribute")
        public static string Read(string path, string node, string attribute)
        {
            string value = "";
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);
            }
            catch { }
            return value;
        }

        /// <summary>
        /// 获取某一节点的所有孩子节点的值
        /// </summary>
        /// <param name="node">要查询的节点</param>
        public string[] ReadAllChildallValue(string node)
        {
            int i = 0;
            string[] str = { };
            XmlDocument doc = XMLLoad();
            XmlNode xn = doc.SelectSingleNode(node);
            XmlNodeList nodelist = xn.ChildNodes;  //得到该节点的子节点
            if (nodelist.Count > 0)
            {
                str = new string[nodelist.Count];
                foreach (XmlElement el in nodelist)//读元素值
                {
                    str[i] = el.Value;
                    i++;
                }
            }
            return str;
        }

        /// <summary>
        /// 获取某一节点的所有孩子节点的值
        /// </summary>
        /// <param name="node">要查询的节点</param>
        public XmlNodeList ReadAllChild(string node)
        {
            XmlDocument doc = XMLLoad();
            XmlNode xn = doc.SelectSingleNode(node);
            XmlNodeList nodelist = xn.ChildNodes;  //得到该节点的子节点
            return nodelist;
        }

        /// <summary> 
        /// 读取XML返回经排序或筛选后的DataView
        /// </summary>
        /// <param name="strWhere">筛选条件，如:"name='kgdiwss'"</param>
        /// <param name="strSort"> 排序条件，如:"Id desc"</param>
        public DataView GetDataViewByXml(string strWhere, string strSort)
        {
            try
            {
                string XMLFile = this.XMLPath;
                string filename = AppDomain.CurrentDomain.BaseDirectory.ToString() + XMLFile;
                DataSet ds = new DataSet();
                ds.ReadXml(filename);
                DataView dv = new DataView(ds.Tables[0]); //创建DataView来完成排序或筛选操作	
                if (strSort != null)
                {
                    dv.Sort = strSort; //对DataView中的记录进行排序
                }
                if (strWhere != null)
                {
                    dv.RowFilter = strWhere; //对DataView中的记录进行筛选，找到我们想要的记录
                }
                return dv;
            }
            catch (Exception)
            {
                return null;
            }
        }
        #endregion

        #region 插入数据
        /// <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>
        /// 使用示列:
        /// XMLProsess.Insert(path, "/Node", "Element", "", "Value")
        /// XMLProsess.Insert(path, "/Node", "Element", "Attribute", "Value")
        /// XMLProsess.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(AppDomain.CurrentDomain.BaseDirectory.ToString() + 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(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch { }
        }

        /// <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="strList">由XML属性名和值组成的二维数组</param>
        public static void Insert(string path, string node, string element, string[][] strList)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = doc.CreateElement(element);
                string strAttribute = "";
                string strValue = "";
                for (int i = 0; i < strList.Length; i++)
                {
                    for (int j = 0; j < strList[i].Length; j++)
                    {
                        if (j == 0)
                            strAttribute = strList[i][j];
                        else
                            strValue = strList[i][j];
                    }
                    if (strAttribute.Equals(""))
                        xe.InnerText = strValue;
                    else
                        xe.SetAttribute(strAttribute, strValue);
                }
                xn.AppendChild(xe);
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch { }
        }

        #endregion

        #region 修改数据
        /// <summary>
        /// 修改指定节点的数据
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="value">值</param>
        public void Update(string node, string value)
        {
            try
            {
                XmlDocument doc = XMLLoad();
                XmlNode xn = doc.SelectSingleNode(node);
                xn.InnerText = value;
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + XMLPath);
            }
            catch { }
        }

        /// <summary>
        /// 修改指定节点的数据
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="node">节点</param>
        /// <param name="value">值</param>
        /// 使用示列:
        /// XMLProsess.Insert(path, "/Node","Value")
        /// XMLProsess.Insert(path, "/Node","Value")
        public static void Update(string path, string node, string value)
        {
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                xn.InnerText = value;
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch { }
        }

        /// <summary>
        /// 修改指定节点的属性值(静态)
        /// </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>
        /// 使用示列:
        /// XMLProsess.Insert(path, "/Node", "", "Value")
        /// XMLProsess.Insert(path, "/Node", "Attribute", "Value")
        public static void Update(string path, string node, string attribute, string value)
        {
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xe.InnerText = value;
                else
                    xe.SetAttribute(attribute, value);
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch { }
        }

        #endregion

        #region 删除数据
        /// <summary>
        /// 删除节点值
        /// </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>
        /// 使用示列:
        /// XMLProsess.Delete(path, "/Node", "")
        /// XMLProsess.Delete(path, "/Node", "Attribute")
        public static void Delete(string path, string node)
        {
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                xn.ParentNode.RemoveChild(xn);
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + 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>
        /// 使用示列:
        /// XMLProsess.Delete(path, "/Node", "")
        /// XMLProsess.Delete(path, "/Node", "Attribute")
        public static void Delete(string path, string node, string attribute)
        {
            try
            {
                XmlDocument doc = XMLLoad(path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xn.ParentNode.RemoveChild(xn);
                else
                    xe.RemoveAttribute(attribute);
                doc.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() + path);
            }
            catch { }
        }

        #endregion
    }
}