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

namespace CodeGenerator.Common
{
    public class XmlHelper
    {
        #region Field
        protected string strXmlFile;
        protected XmlDocument objXmlDoc = new XmlDocument();
        #endregion

        #region Constructors
        public XmlHelper(string XmlFile)
        {
            try
            {
                objXmlDoc.Load(XmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            strXmlFile = XmlFile;
        }
        #endregion

        #region Method
        /// <summary>
        /// 读取节点内容
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <param name="Attrib"></param>
        /// <returns></returns>
        public string Read(string XmlPathNode, string Attrib)
        {
            string value = "";
            try
            {
                XmlNode xn = objXmlDoc.SelectSingleNode(XmlPathNode);
                value = (Attrib.Equals("") ? xn.InnerText : xn.Attributes[Attrib].Value);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return value;
        }

        /// <summary>
        /// 替换某节点的内容
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <param name="Content"></param>
        public void Replace(string XmlPathNode, string Content)
        {
            objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
        }

        /// <summary>
        /// 删除节点
        /// </summary>
        /// <param name="Node"></param>
        public void Delete(string Node)
        {
            string mainNode = Node.Substring(0, Node.LastIndexOf("/"));
            objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
        }

        /// <summary>
        /// 插入一节点和此节点的一子节点
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="ChildNode"></param>
        /// <param name="Element"></param>
        /// <param name="Content"></param>
        public void InsertNode(string MainNode, string ChildNode, string Element, string Content)
        {
            XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
            objRootNode.AppendChild(objChildNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objChildNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入一个节点带一个属性 
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="Element"></param>
        /// <param name="Attrib"></param>
        /// <param name="AttribContent"></param>
        /// <param name="Content"></param>
        public void InsertElement(string MainNode, string Element, string Attrib, string AttribContent, string Content)
        {
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.SetAttribute(Attrib, AttribContent);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入
        /// </summary>
        /// <param name="MainNode"></param>
        /// <param name="Element"></param>
        /// <param name="Content"></param>
        public void InsertElement(string MainNode, string Element, string Content)
        {
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 保存XML
        /// </summary>
        public void Save()
        {
            try
            {
                objXmlDoc.Save(strXmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            objXmlDoc = null;
        }
        #endregion
    }
}