using System;
using System.Collections;
using System.Data;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

namespace WWPipeLine.Commons
{
	/// <summary>
	/// Xml 序列化和反序列化类
	/// </summary>
	public class XmlHelper
	{

		#region 公共变量
		XmlDocument xmldoc;
		XmlNode xmlnode;
		XmlElement xmlelem;
		#endregion

		#region 创建Xml文档
		/// <summary>
		/// 创建一个带有根节点的Xml文件
		/// </summary>
		/// <param name="FileName">Xml文件名称</param>
		/// <param name="rootName">根节点名称</param>
		/// <param name="Encode">编码方式:gb2312，UTF-8等常见的</param>
		/// <param name="DirPath">保存的目录路径</param>
		/// <returns></returns>
		public bool CreateXmlDocument(string FileName, string RootName, string Encode)
		{
			try
			{
				xmldoc = new XmlDocument();
				XmlDeclaration xmldecl;
				xmldecl = xmldoc.CreateXmlDeclaration("1.0", Encode, null);
				xmldoc.AppendChild(xmldecl);
				xmlelem = xmldoc.CreateElement("", RootName, "");
				xmldoc.AppendChild(xmlelem);
				xmldoc.Save(FileName);
				return true;
			}
			catch (Exception e)
			{
				throw new Exception(e.Message);
			}
		}

		#endregion

		#region 常用操作方法(增删改)
		/// <summary>
		/// 插入一个节点和它的若干子节点
		/// </summary>
		/// <param name="XmlFile">Xml文件路径</param>
		/// <param name="NewNodeName">插入的节点名称</param>
		/// <param name="HasAttributes">此节点是否具有属性，True为有，False为无</param>
		/// <param name="fatherNode">此插入节点的父节点,要匹配的XPath表达式(例如:"//节点名//子节点名)</param>
		/// <param name="htAtt">此节点的属性，Key为属性名，Value为属性值</param>
		/// <param name="htSubNode">子节点的属性，Key为Name,Value为InnerText</param>
		/// <returns>返回真为更新成功，否则失败</returns>
		public bool InsertNode(string XmlFile, string NewNodeName, bool HasAttributes, string fatherNode, Hashtable htAtt, Hashtable htSubNode)
		{
			try
			{
				xmldoc = new XmlDocument();
				xmldoc.Load(XmlFile);
				XmlNode root = xmldoc.SelectSingleNode(fatherNode);
				xmlelem = xmldoc.CreateElement(NewNodeName);
				if (htAtt != null && HasAttributes)//若此节点有属性，则先添加属性
				{
					SetAttributes(xmlelem, htAtt);
					SetNodes(xmlelem.Name, xmldoc, xmlelem, htSubNode);//添加完此节点属性后，再添加它的子节点和它们的InnerText
				}
				else
				{
					SetNodes(xmlelem.Name, xmldoc, xmlelem, htSubNode);//若此节点无属性，那么直接添加它的子节点
				}

				root.AppendChild(xmlelem);
				xmldoc.Save(XmlFile);

				return true;
			}
			catch (Exception e)
			{
				throw new Exception(e.Message);
			}
		}
		/// <summary>
		/// 更新节点
		/// </summary>
		/// <param name="XmlFile">Xml文件路径</param>
		/// <param name="fatherNode">需要更新节点的上级节点,要匹配的XPath表达式(例如:"//节点名//子节点名)</param>
		/// <param name="htAtt">需要更新的属性表，Key代表需要更新的属性，Value代表更新后的值</param>
		/// <param name="htSubNode">需要更新的子节点的属性表，Key代表需要更新的子节点名字Name,Value代表更新后的值InnerText</param>
		/// <returns>返回真为更新成功，否则失败</returns>
		public bool UpdateNode(string XmlFile, string fatherNode, Hashtable htAtt, Hashtable htSubNode)
		{
			try
			{
				xmldoc = new XmlDocument();
				xmldoc.Load(XmlFile);
				XmlNodeList root = xmldoc.SelectSingleNode(fatherNode).ChildNodes;
				UpdateNodes(root, htAtt, htSubNode);
				xmldoc.Save(XmlFile);
				return true;
			}
			catch (Exception e)
			{
				throw new Exception(e.Message);
			}
		}

		/// <summary>
		/// 删除指定节点下的子节点
		/// </summary>
		/// <param name="XmlFile">Xml文件路径</param>
		/// <param name="fatherNode">制定节点,要匹配的XPath表达式(例如:"//节点名//子节点名)</param>
		/// <returns>返回真为更新成功，否则失败</returns>
		public bool DeleteNodes(string XmlFile, string fatherNode)
		{
			try
			{
				xmldoc = new XmlDocument();
				xmldoc.Load(XmlFile);
				xmlnode = xmldoc.SelectSingleNode(fatherNode);
				xmlnode.RemoveAll();
				xmldoc.Save(XmlFile);
				return true;
			}
			catch (XmlException xe)
			{
				throw new XmlException(xe.Message);
			}
		}
		/// <summary>
		/// 删除匹配XPath表达式的第一个节点(节点中的子元素同时会被删除)
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
		/// <returns>成功返回true,失败返回false</returns>
		public bool DeleteXmlNodeByXPath(string xmlFileName, string xpath)
		{
			bool isSuccess = false;
			xmldoc = new XmlDocument();
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNode xmlNode = xmldoc.SelectSingleNode(xpath);
				if (xmlNode != null)
				{
					//删除节点
					xmldoc.ParentNode.RemoveChild(xmlNode);
				}
				xmldoc.Save(xmlFileName); //保存到XML文档
				isSuccess = true;
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
			return isSuccess;
		}

		/// <summary>
		/// 删除匹配XPath表达式的第一个节点中的匹配参数xmlAttributeName的属性
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
		/// <param name="xmlAttributeName">要删除的xmlAttributeName的属性名称</param>
		/// <returns>成功返回true,失败返回false</returns>
		public bool DeleteXmlAttributeByXPath(string xmlFileName, string xpath, string xmlAttributeName)
		{
			bool isSuccess = false;
			bool isExistsAttribute = false;
			xmldoc = new XmlDocument();
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNode xmlNode = xmldoc.SelectSingleNode(xpath);
				XmlAttribute xmlAttribute = null;
				if (xmlNode != null)
				{
					//遍历xpath节点中的所有属性
					foreach (XmlAttribute attribute in xmlNode.Attributes)
					{
						if (attribute.Name.ToLower() == xmlAttributeName.ToLower())
						{
							//节点中存在此属性
							xmlAttribute = attribute;
							isExistsAttribute = true;
							break;
						}
					}
					if (isExistsAttribute)
					{
						//删除节点中的属性
						xmlNode.Attributes.Remove(xmlAttribute);
					}
				}
				xmldoc.Save(xmlFileName); //保存到XML文档
				isSuccess = true;
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
			return isSuccess;
		}

		/// <summary>
		/// 删除匹配XPath表达式的第一个节点中的所有属性
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
		/// <returns>成功返回true,失败返回false</returns>
		public bool DeleteAllXmlAttributeByXPath(string xmlFileName, string xpath)
		{
			bool isSuccess = false;
			xmldoc = new XmlDocument();
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNode xmlNode = xmldoc.SelectSingleNode(xpath);
				if (xmlNode != null)
				{
					//遍历xpath节点中的所有属性
					xmlNode.Attributes.RemoveAll();
				}
				xmldoc.Save(xmlFileName); //保存到XML文档
				isSuccess = true;
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
			return isSuccess;
		}
		#endregion

		#region 私有方法
		/// <summary>
		/// 设置节点属性
		/// </summary>
		/// <param name="xe">节点所处的Element</param>
		/// <param name="htAttribute">节点属性，Key代表属性名称，Value代表属性值</param>
		private void SetAttributes(XmlElement xe, Hashtable htAttribute)
		{
			foreach (DictionaryEntry de in htAttribute)
			{
				xe.SetAttribute(de.Key.ToString(), de.Value.ToString());
			}
		}
		/// <summary>
		/// 增加子节点到根节点下
		/// </summary>
		/// <param name="rootNode">上级节点名称</param>
		/// <param name="XmlDoc">Xml文档</param>
		/// <param name="rootXe">父根节点所属的Element</param>
		/// <param name="SubNodes">子节点属性，Key为Name值，Value为InnerText值</param>
		private void SetNodes(string rootNode, XmlDocument XmlDoc, XmlElement rootXe, Hashtable SubNodes)
		{
			if (SubNodes == null)
				return;
			foreach (DictionaryEntry de in SubNodes)
			{
				xmlnode = XmlDoc.SelectSingleNode(rootNode);
				XmlElement subNode = XmlDoc.CreateElement(de.Key.ToString());
				subNode.InnerText = de.Value.ToString();
				rootXe.AppendChild(subNode);
			}
		}
		/// <summary>
		/// 更新节点属性和子节点InnerText值。柯 乐 义
		/// </summary>
		/// <param name="root">根节点名字</param>
		/// <param name="htAtt">需要更改的属性名称和值</param>
		/// <param name="htSubNode">需要更改InnerText的子节点名字和值</param>
		private void UpdateNodes(XmlNodeList root, Hashtable htAtt, Hashtable htSubNode)
		{
			foreach (XmlNode xn in root)
			{
				xmlelem = (XmlElement)xn;
				if (xmlelem.HasAttributes)//如果节点如属性，则先更改它的属性
				{
					foreach (DictionaryEntry de in htAtt)//遍历属性哈希表
					{
						if (xmlelem.HasAttribute(de.Key.ToString()))//如果节点有需要更改的属性
						{
							xmlelem.SetAttribute(de.Key.ToString(), de.Value.ToString());//则把哈希表中相应的值Value赋给此属性Key
						}
					}
				}
				if (xmlelem.HasChildNodes)//如果有子节点，则修改其子节点的InnerText
				{
					XmlNodeList xnl = xmlelem.ChildNodes;
					foreach (XmlNode xn1 in xnl)
					{
						XmlElement xe = (XmlElement)xn1;
						foreach (DictionaryEntry de in htSubNode)
						{
							if (xe.Name == de.Key.ToString())//htSubNode中的key存储了需要更改的节点名称，
							{
								xe.InnerText = de.Value.ToString();//htSubNode中的Value存储了Key节点更新后的数据
							}
						}
					}
				}

			}
		}
		#endregion

		#region XML文档节点查询和读取	
		/// <summary>
		/// 选择匹配XPath表达式的第一个节点XmlNode.
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名")</param>
		/// <returns>返回XmlNode</returns>
		public XmlNode GetXmlNodeByXpath(string xmlFileName, string xpath)
		{
			xmldoc = new XmlDocument();
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNode xmlNode = xmldoc.SelectSingleNode(xpath);
				return xmlNode;
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
		}

		/// <summary>
		/// 选择匹配XPath表达式的节点列表XmlNodeList.
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名")</param>
		/// <returns>返回XmlNodeList</returns>
		public XmlNodeList GetXmlNodeListByXpath(string xmlFileName, string xpath)
		{
			xmldoc = new XmlDocument();
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNodeList xmlNodeList = xmldoc.SelectNodes(xpath);
				return xmlNodeList;
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
		}



		/// <summary>
		/// 选择匹配XPath表达式的第一个节点的匹配xmlAttributeName的属性XmlAttribute
		/// </summary>
		/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
		/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
		/// <param name="xmlAttributeName">要匹配xmlAttributeName的属性名称</param>
		/// <returns>返回xmlAttributeName</returns>
		public XmlAttribute GetXmlAttribute(string xmlFileName, string xpath, string xmlAttributeName)
		{
			string content = string.Empty;
			xmldoc = new XmlDocument();
			XmlAttribute xmlAttribute = null;
			try
			{
				xmldoc.Load(xmlFileName); //加载XML文档
				XmlNode xmlNode = xmldoc.SelectSingleNode(xpath);
				if (xmlNode != null)
				{
					if (xmlNode.Attributes.Count > 0)
					{
						xmlAttribute = xmlNode.Attributes[xmlAttributeName];
					}
				}
			}
			catch (Exception ex)
			{
				throw ex; //这里可以定义你自己的异常处理
			}
			return xmlAttribute;
		}
		#endregion




		/// <summary>
		/// 序列化对象为XML文件
		/// </summary>
		/// <typeparam name="T">序列化对象</typeparam>
		/// <param name="fileName">序列化文件路径</param>
		/// <param name="t">序列化对象</param>
		/// <returns></returns>
		public static bool SerializedToXml<T>(string fileName, T t)
		{
			try
			{
				Type paramType = t.GetType();
				XmlSerializer xmls = new XmlSerializer(paramType);
				using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
				{
					xmls.Serialize(fs, t);
				}
				return true;
			}
			catch (Exception ex)
			{
				System.Diagnostics.Debug.WriteLine("Serialize xml Error：" + ex.ToString());
				return false;
			}
		}

		/// <summary>
		/// 反序列化对象
		/// </summary>
		/// <typeparam name="T">反序列化的对象</typeparam>
		/// <param name="fileName">反序列化文件的路径</param>
		/// <param name="t">反序列化出来的路径</param>
		/// <returns></returns>
		public static bool DeSerializedFromXml<T>(string fileName, ref T t)
		{
			try
			{
				Type paramType = t.GetType();
				XmlSerializer xmls = new XmlSerializer(paramType);

				using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
				{
					t = (T)xmls.Deserialize(fs);
				}
				return true;
			}
			catch (Exception ex)
			{
				System.Diagnostics.Debug.WriteLine("DeSerialize xml Error：" + ex.ToString());
				return false;
			}
		}

		/// <summary>
		/// 将xml对象内容字符串转换为DataSet
		/// </summary>
		/// <param name="xmlData"></param>
		/// <returns></returns>
		public static DataSet ConvertXMLToDataSet(string xmlData)
		{
			XmlTextReader reader = null;
			try
			{
				DataSet xmlDS = new DataSet();
				StringReader stream = new StringReader(xmlData);
				reader = new XmlTextReader(stream);
				xmlDS.ReadXml(reader);
				return xmlDS;
			}
			catch (System.Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (reader != null) reader.Close();
			}
		}

		/// <summary>
		/// 将xml文件转换为DataSet
		/// </summary>
		/// <param name="xmlFile"></param>
		/// <returns></returns>
		public static DataSet ConvertXMLFileToDataSet(string xmlFile)
		{
			XmlTextReader reader = null;
			try
			{
				XmlDocument xmld = new XmlDocument();
				xmld.Load(xmlFile);
				DataSet xmlDS = new DataSet();
				StringReader stream = new StringReader(xmld.InnerXml);
				reader = new XmlTextReader(stream);
				xmlDS.ReadXml(reader);
				return xmlDS;
			}
			catch (System.Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (reader != null) reader.Close();
			}
		}

		/// <summary>
		/// 将DataSet转换为xml对象字符串
		/// </summary>
		/// <param name="xmlDS"></param>
		/// <returns></returns>
		public static string ConvertDataSetToXML(DataSet xmlDS)
		{
			XmlTextWriter writer = null;
			try
			{
				MemoryStream stream = new MemoryStream();
				writer = new XmlTextWriter(stream, Encoding.Unicode);
				xmlDS.WriteXml(writer);
				int count = (int)stream.Length;
				byte[] arr = new byte[count];
				stream.Seek(0, SeekOrigin.Begin);
				stream.Read(arr, 0, count);
				UnicodeEncoding utf = new UnicodeEncoding();
				return utf.GetString(arr).Trim();
			}
			catch (System.Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (writer != null) writer.Close();
			}
		}

		/// <summary>
		/// 将DataSet转换为xml文件
		/// </summary>
		/// <param name="xmlDS"></param>
		/// <param name="xmlFile"></param>
		public static void ConvertDataSetToXMLFile(DataSet xmlDS, string xmlFile)
		{
			XmlTextWriter writer = null;
			try
			{
				MemoryStream stream = new MemoryStream();
				writer = new XmlTextWriter(stream, Encoding.Unicode);
				xmlDS.WriteXml(writer);
				int count = (int)stream.Length;
				byte[] arr = new byte[count];
				stream.Seek(0, SeekOrigin.Begin);
				stream.Read(arr, 0, count);
				UnicodeEncoding utf = new UnicodeEncoding();
				StreamWriter sw = new StreamWriter(xmlFile);
				sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
				sw.WriteLine(utf.GetString(arr).Trim());
				sw.Close();
			}
			catch (System.Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (writer != null) writer.Close();
			}
		}
	}
}