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

namespace StandardLibrary
{
    /*************************************************************************
    注：XML元素节点名称命名规则
        1.名称的开头必须是字母、汉字或下划线“_”；
        2.标记名称中不能有空格；
        3.名称的字符串只能包含字母，数字，“_”，“-”，“.”；
    **************************************************************************/

    /// <summary>
    /// XML操作类
    /// </summary>
    class XmlHandle
    {
        XmlDocument xmlDoc = new XmlDocument();

        private string fileName;    //路径+XML文件名

        public XmlHandle(string fileName)
        {
            this.fileName = fileName;
        }

        /// <summary>
        /// 打开XML文件
        /// </summary>
        public string Open()
        {
            try
            {
                xmlDoc.Load(fileName);
                return null;
            }
            catch (Exception ex) { return ex.Message; }
        }

        /// <summary>
        /// 保存XML文件
        /// </summary>
        /// <returns></returns>
        public string Save()
        {
            try
            {
                xmlDoc.Save(fileName);
                return null;
            }
            catch (Exception ex) { return ex.Message; }
        }


        #region 写操作

        /// <summary>
        /// 添加根节点
        /// </summary>
        /// <param name="rootName">根节点名</param>
        /// <returns></returns>
        public XmlNode AddRootNode(string rootName)
        {
            XmlElement root = (XmlElement)GetRootNode();
            if (xmlDoc.FirstChild == null)
            {
                XmlNode node = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", "");//创建类型声明节点    
                xmlDoc.AppendChild(node);
            }
            if (root == null)
            {
                root = xmlDoc.CreateElement(rootName);  //创建根节点
                xmlDoc.AppendChild(root);
            }
            return (XmlNode)root;
        }

        /// <summary>
        /// 添加节点
        /// </summary>
        /// <param name="parentNode">父节点</param>
        /// <param name="name">节点名</param>
        /// <param name="value">节点值</param>
        /// <returns></returns>
        public XmlNode AddChildNode(XmlNode parentNode, string name, string value = null)
        {
            XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, name, null);
            node.InnerText = value;
            parentNode.AppendChild(node);
            return node;
        }

        /// <summary>
        /// 删除节点
        /// </summary>
        /// <param name="node"></param>
        public void RemoveNode(XmlNode node)
        {
            node.ParentNode.RemoveChild(node);
        }

        /// <summary>
        /// 删除父节点下所有子节点
        /// </summary>
        public void RemoveAllNode(XmlNode parentNode)
        {
            parentNode.RemoveAll();
        }

        /// <summary>
        /// 设置节点的属性
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="name">属性名</param>
        /// <param name="attribute">属性值</param>
        public void SetNodeAttribute(XmlNode node, string name, string attribute)
        {
            XmlElement n = (XmlElement)node;
            n.SetAttribute(name, attribute);
        }

        /// <summary>
        /// 删除节点的属性
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="name">属性名</param>
        public void RemoveNoedAttribute(XmlNode node, string name)
        {
            XmlElement n = (XmlElement)node;
            n.RemoveAttribute(name);
        }

        /// <summary>
        /// 设置节点的值
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="value">设置值</param>
        public void SetNodeValue(XmlNode node, string value)
        {
            node.InnerText = value;
        }

        #endregion

        #region 读操作

        //public XmlDeclaration GetDeclarationNode()
        //{
        //    return xmlDoc.
        //}

        /// <summary>
        /// 获取根节点
        /// </summary>
        /// <returns></returns>
        public XmlNode GetRootNode()
        {
            return xmlDoc.DocumentElement;
        }

        /// <summary>
        /// 获取父节点下指定的子节点
        /// </summary>
        /// <param name="parentNode">父节点</param>
        /// <param name="nodeName">节点名</param>
        /// <returns></returns>
        public XmlNode GetCertainChildNode(XmlNode parentNode, string nodeName)
        {
            return parentNode.SelectSingleNode(nodeName);
        }

        /// <summary>
        /// 获取父节点的第一个子节点
        /// </summary>
        /// <param name="parentNode">父节点</param>
        /// <returns></returns>
        public XmlNode GetFirstChildNode(XmlNode parentNode)
        {
            return parentNode.FirstChild;
        }

        /// <summary>
        /// 获取父节点的所有子节点
        /// </summary>
        /// <param name="parentNode">父节点</param>
        /// <returns></returns>
        public XmlNodeList GetAllChildNode(XmlNode parentNode)
        {
            return parentNode.ChildNodes;
        }

        /// <summary>
        /// 获取节点的属性
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="name">属性名</param>
        /// <returns></returns>
        public string GetNodeAttribute(XmlNode node, string name)
        {
            XmlElement n = (XmlElement)node;
            return n.GetAttribute(name);
        }

        /// <summary>
        /// 获取节点的值
        /// </summary>
        /// <param name="node">节点</param>
        /// <returns></returns>
        public string GetNodeValue(XmlNode node)
        {
            return node.InnerText;
        }

        /// <summary>
        /// 获取节点的名称
        /// </summary>
        /// <param name="node">节点</param>
        /// <returns></returns>
        public string GetNodeName(XmlNode node)
        {
            return node.Name;
        }
        #endregion
    }
}