xmlHelper

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Collections.Generic;
using System.Text;

namespace GTA.DC.MTAC.Client.BLL
{
    /// <summary>
    /// 描述：XML操作类
    /// 作者：
    /// 时间：2011-5-18
    /// </summary>
    public class XmlHelper
    {
        /// <summary>
        /// 读取数据
        /// </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>
        /// <returns>string</returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Read(path, "/Node", "")
         * XmlHelper.Read(path, "/Node/Element[@Attribute='Name']", "Attribute")
         ************************************************/
        public string Read(string path, string node, string attribute)
        {
            string value = "";
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);
            }
            catch { }
            return value;
        }


        /// <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>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Insert(path, "/Node", "Element", "", "Value")
         * XmlHelper.Insert(path, "/Node", "Element", "Attribute", "Value")
         * XmlHelper.Insert(path, "/Node", "", "Attribute", "Value")
         ************************************************/
        public void Insert(string path, string node, string element, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(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(path);
            }
            catch { }
        }
        /// <summary>
        /// 修改数据
        /// </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>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Insert(path, "/Node", "", "Value")
         * XmlHelper.Insert(path, "/Node", "Attribute", "Value")
         ************************************************/
        public void Update(string path, string node, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xe.InnerText = value;
                else
                    xe.SetAttribute(attribute, value);
                doc.Save(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>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Delete(path, "/Node", "")
         * XmlHelper.Delete(path, "/Node", "Attribute")
         ************************************************/
        public void Delete(string path, string node, string attribute)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xn.ParentNode.RemoveChild(xn);
                else
                    xe.RemoveAttribute(attribute);
                doc.Save(path);
            }
            catch { }
        }

        private XmlDocument xmlDoc;
        /// <summary>  
        /// 加载xml文件  
        /// </summary>  
        /// <param name="path">xml文件的物理路径</param>  
        private void LoadXml(string path, string node_root)
        {
            xmlDoc = new XmlDocument();
            //判断xml文件是否存在  
            if (!System.IO.File.Exists(path))
            {
                //创建xml 声明节点  
                XmlNode xmlnode = xmlDoc.CreateNode(System.Xml.XmlNodeType.XmlDeclaration, "", "");
                //添加上述创建和 xml声明节点  
                xmlDoc.AppendChild(xmlnode);
                //创建xml dbGuest 元素（根节点）  
                XmlElement xmlelem = xmlDoc.CreateElement("", node_root, "");
                xmlDoc.AppendChild(xmlelem);
                try
                {
                    xmlDoc.Save(path);
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                xmlDoc.Load(path);
            }
            else
            {
                //加载xml文件  
                xmlDoc.Load(path);
            }
            GC.Collect();
        }
        /// <summary>  
        /// 添加xml子节点  
        /// </summary>  
        /// <param name="path">xml文件的物理路径</param>  
        /// <param name="node_root">根节点名称</param>  
        /// <param name="node_name">添加的子节点名称</param>  
        /// <param name="node_text">子节点文本</param>  
        public void addElement(string path, string node_root, string node_name, string node_text, string att_name, string att_value)
        {
            LoadXml(path, node_root);
            XmlNodeList nodeList = xmlDoc.SelectSingleNode(node_root).ChildNodes;//获取bookstore节点的所有子节点 
            //判断是否有节点,有节点就遍历所有子节点,看看有没有重复节点,没节点就添加一个新节点  
            if (nodeList.Count > 0)
            {
                foreach (XmlNode xn in nodeList)//遍历所有子节点   
                {
                    XmlElement xe = (XmlElement)xn;//将子节点类型转换为XmlElement类型
                    if (xe.GetAttribute(att_name) != att_value)
                    {
                        XmlNode xmldocSelect = xmlDoc.SelectSingleNode(node_root);   //选中根节点  
                        XmlElement son_node = xmlDoc.CreateElement(node_name);    //添加子节点   
                        son_node.SetAttribute(att_name, att_value);     //设置属性  
                        son_node.InnerText = node_text;    //添加节点文本  
                        xmldocSelect.AppendChild(son_node);       //添加子节点  
                        xmlDoc.Save(path);          //保存xml文件  
                        break;
                    }
                }
            }
            else
            {
                XmlNode xmldocSelect = xmlDoc.SelectSingleNode(node_root);   //选中根节点  
                XmlElement son_node = xmlDoc.CreateElement(node_name);    //添加子节点   
                son_node.SetAttribute(att_name, att_value);     //设置属性  
                son_node.InnerText = node_text;    //添加节点文本  
                xmldocSelect.AppendChild(son_node);       //添加子节点  
                xmlDoc.Save(path);          //保存xml文件  
            }
        }
        /// <summary>  
        /// 修改节点的内容  
        /// </summary>  
        /// <param name="path">xml文件的物理路径</param>  
        /// <param name="node_root">根节点名称</param>  
        /// <param name="new_text">节点的新内容</param>  
        /// <param name="att_name">节点的属性名</param>  
        /// <param name="att_value">节点的属性值</param>  
        public void UpdateElement(string path, string node_root, string new_text, string att_name, string att_value)
        {
            LoadXml(path, node_root);
            XmlNodeList nodeList = xmlDoc.SelectSingleNode(node_root).ChildNodes;//获取bookstore节点的所有子节点
            foreach (XmlNode xn in nodeList)//遍历所有子节点
            {
                XmlElement xe = (XmlElement)xn;//将子节点类型转换为XmlElement类型
                if (xe.GetAttribute(att_name) == att_value)
                {
                    xe.InnerText = new_text;    //内容赋值  
                    xmlDoc.Save(path);//保存   
                    break;
                }
            }
        }
        /// <summary>  
        /// 删除节点  
        /// </summary>  
        /// <param name="path">xml文件的物理路径</param>  
        /// <param name="node_root">根节点名称</param>  
        /// <param name="att_name">节点的属性名</param>  
        /// <param name="att_value">节点的属性值</param>  
        public void deleteNode(string path, string node_root, string att_name, string att_value)
        {
            LoadXml(path, node_root);
            XmlNodeList nodeList = xmlDoc.SelectSingleNode(node_root).ChildNodes;
            XmlNode root = xmlDoc.SelectSingleNode(node_root);
            foreach (XmlNode xn in nodeList)
            {
                XmlElement xe = (XmlElement)xn;
                if (xe.GetAttribute(att_name) == att_value)
                {
                    //xe.RemoveAttribute("name");//删除name属性   
                    xe.RemoveAll();//删除该节点的全部内容  
                    root.RemoveChild(xe);
                    xmlDoc.Save(path);//保存   
                    break;
                }
            }
        }


        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="filePath"></param>
        /// <param name="obj"></param>
        public static void Serialize<T>(string filePath, T[] array) where T : new()
        {
            if (string.IsNullOrEmpty(filePath) ||
                array == null || array.Length == 0)
            {
                return;
            }

            try
            {
                XmlSerializerFactory xmlSerializerFactory = new XmlSerializerFactory();
                XmlSerializer xmlSerializer =
                    xmlSerializerFactory.CreateSerializer(array.GetType(), typeof(T).Name);
                Stream stream = new FileStream(filePath, FileMode.Create);
                xmlSerializer.Serialize(stream, array);
                stream.Close();
            }
            catch
            {
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="filePath"></param>
        /// <param name="obj"></param>
        public static void Serialize<T>(string filePath, List<T> array) where T : new()
        {
            if (string.IsNullOrEmpty(filePath) ||
                array == null || array.Count == 0)
            {
                return;
            }

            try
            {
                XmlSerializerFactory xmlSerializerFactory = new XmlSerializerFactory();
                XmlSerializer xmlSerializer =
                    xmlSerializerFactory.CreateSerializer(array.GetType(), typeof(T).Name);
                Stream stream = new FileStream(filePath, FileMode.Create);
                xmlSerializer.Serialize(stream, array);
                stream.Close();
            }
            catch
            {
            }
        }



        /// <summary>
        /// 
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="obj"></param>
        public static void Serialize(string filePath, object obj)
        {
            if (string.IsNullOrEmpty(filePath) || obj == null)
            {
                return;
            }

            try
            {
                XmlSerializerFactory xmlSerializerFactory = new XmlSerializerFactory();
                XmlSerializer xmlSerializer =
                    xmlSerializerFactory.CreateSerializer(obj.GetType(), obj.GetType().Name);
                Stream stream = new FileStream(filePath, FileMode.Create);
                xmlSerializer.Serialize(stream, obj);
                stream.Close();
            }
            catch
            {
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static List<T> Deserialize<T>(string filePath) where T : new()
        {
            List<T> results = new List<T>();
            if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
            {
                return results;
            }

            object obj = null;
            try
            {
                XmlSerializerFactory xmlSerializerFactory = new XmlSerializerFactory();
                XmlSerializer xmlSerializer =
                    xmlSerializerFactory.CreateSerializer(typeof(T[]), typeof(T).Name);
                Stream stream = new FileStream(filePath, System.IO.FileMode.Open);
                obj = xmlSerializer.Deserialize(stream);
                stream.Close();

                results.AddRange(obj as T[]);
            }
            catch
            {
            }

            return results;
        }



        /// <summary>
        /// 
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="targetType"></param>
        /// <returns></returns>
        public static object Deserialize(string filePath, Type targetType)
        {
            if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath)
                || targetType == null)
            {
                return null;
            }

            object obj = null;
            try
            {
                XmlSerializerFactory xmlSerializerFactory = new XmlSerializerFactory();
                XmlSerializer xmlSerializer =
                    xmlSerializerFactory.CreateSerializer(targetType, targetType.Name);
                Stream stream = new FileStream(filePath, FileMode.Open);
                obj = xmlSerializer.Deserialize(stream);
                stream.Close();
            }
            catch
            {
            }

            return obj;
        }

        /**/
        /// <summary>
        /// 将DataTable对象转换成XML字符串
        /// </summary>
        /// <param name="dt">DataTable对象</param>
        /// <returns>XML字符串</returns>
        public static string CDataToXml(DataTable dt)
        {
            if (dt != null)
            {
                MemoryStream ms = null;
                XmlTextWriter XmlWt = null;
                try
                {
                    ms = new MemoryStream();
                    //根据ms实例化XmlWt
                    XmlWt = new XmlTextWriter(ms, Encoding.Unicode);
                    //获取ds中的数据
                    dt.WriteXml(XmlWt);
                    int count = (int)ms.Length;
                    byte[] temp = new byte[count];
                    ms.Seek(0, SeekOrigin.Begin);
                    ms.Read(temp, 0, count);
                    //返回Unicode编码的文本
                    UnicodeEncoding ucode = new UnicodeEncoding();
                    string returnValue = ucode.GetString(temp).Trim();
                    return returnValue;
                }
                catch (System.Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    //释放资源
                    if (XmlWt != null)
                    {
                        XmlWt.Close();
                        ms.Close();
                        ms.Dispose();
                    }
                }
            }
            else
            {
                return "";
            }
        }

        /// <summary>
        /// 把XML字符串转成DataTable
        /// </summary>
        /// <param name="xmlData"></param>
        /// <returns></returns>
        public static DataTable ConvertXMLToDataSet(string xmlData)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                DataSet xmlDS = new DataSet();
                stream = new StringReader(xmlData);
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                return xmlDS.Tables[0];
            }
            catch (Exception ex)
            {
                string strTest = ex.Message;
                return null;
            }
            finally
            {
                if (reader != null)
                    reader.Close();
            }
        }
    }
}