c# 操作XML文件时名称空间两个问题，附xml操作类

1、xmlns为名称空间，读取时，需指定XmlNamespaceManager，否则无法正确读取。

2、当有名称空间时，CreateElement需设置namespace参数需设置父节点的名称空间，如 _xmlDoc.CreateElement(childNodeName, node.NamespaceURI),否则会出现xmlns=""情况。

结合之前用xml文件的各种情况，写了个xml操作类，未测试全部函数

using System;using System.Data;using System.Configuration;using System.Collections;//引用命名空间using System.Xml;using System.Text;using System.Collections.Generic;using System.Reflection;namespace CreateNhibernateSourceCode{    /// <summary>    /// XmlOp类提供对XML数据库的读写    /// </summary>    public class XMLHelper:IDisposable    {        #region 私有成员        //声明一个XmlDocument空对象        protected XmlDocument _xmlDoc = new XmlDocument();        /// <summary>        /// XML文件名称空间        /// </summary>        XmlNamespaceManager _nsMgr;        /// <summary>        /// 原文件路径        /// </summary>        string _filePath;        #endregion        #region 公共属性        /// <summary>        /// 获取XML文件完整路径        /// </summary>        public string FilePath        {            get { return this._filePath; }        }        #endregion        #region 构造析构        /// <summary>        /// 构造函数，导入Xml文件        /// </summary>        /// <param name="filePath">文件绝对路径</param>        /// <param name="namespacename">顶级节点xmlns内容，名称空间名称，格式：http://schemas.microsoft.com/developer/msbuild/2003 </param>        public XMLHelper(string filePath, string namespacename = null)        {            try            {                _xmlDoc.Load(filePath);   //载入Xml文档                this._filePath = filePath;                                if (!string.IsNullOrEmpty(namespacename))                {                    _nsMgr = new XmlNamespaceManager(_xmlDoc.NameTable);                    _nsMgr.AddNamespace("ns", namespacename);                }            }            catch (System.Exception ex)            {                throw ex;            }        }        /// <summary>        /// 析构函数        /// </summary>        public void Dispose()        {            _xmlDoc = null;  //释放XmlDocument对象        }        #endregion        #region 保存        /// <summary>        /// 另存为        /// </summary>        /// <param name="filePath">文件虚拟路径</param>        public void Save(string filePath)        {            try            {                _xmlDoc.Save(filePath);            }            catch (System.Exception ex)            {                throw ex;            }        }        /// <summary>        /// 保存文        /// </summary>        public void Save()        {            try            {               _xmlDoc.Save(this._filePath);            }            catch (System.Exception ex)            {                throw ex;            }        }        #endregion        #region 获取单节点        /// <summary>        /// 获取无重名单个节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <returns></returns>        public XmlNode SelectSingleNode(string xpath)        {            if (_nsMgr == null)                return _xmlDoc.SelectSingleNode(xpath);            else            {                string[] nodes = xpath.Split('/');                StringBuilder sbNode = new StringBuilder();                foreach (string node in nodes)                {                    sbNode.Append(string.Format("/ns:{0}", node));                }                return _xmlDoc.SelectSingleNode(sbNode.ToString(), _nsMgr);            }        }        /// <summary>        /// 获取单个节点，重名时用，用子节点确定父节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="level">返回父节点级数，默认一级</param>        /// <returns></returns>        public XmlNode SelectParentSingleNode(string xpath,int level=1)        {            try            {                XmlNode parentNode = this.SelectSingleNode(xpath);                if (parentNode != null)                {                    for (int i = 0; i < level; i++)                    {                        parentNode = parentNode.ParentNode;                    }                    return parentNode;                }                else                    return null;            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 获取节点列表        /// <summary>        /// 获取不重名的节点孩子集合        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <returns></returns>        public XmlNodeList SelectChildNodeList(string xpath)        {            try            {                XmlNode parentNode = this.SelectSingleNode(xpath);                if (parentNode!=null && parentNode.HasChildNodes)                    return parentNode.ChildNodes;                else                    return null;            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 获取节点孩子集合，重名时用，通过子节点确定父节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="level">返回父节点级数，默认一级</param>        /// <returns></returns>        public XmlNodeList SelectChildNodeListOfParent(string xpath, int level=1)        {            try            {                XmlNode parentNode = this.SelectSingleNode(xpath);                if (parentNode != null)                {                    for (int i = 0; i < level; i++)                    {                        parentNode = parentNode.ParentNode;                    }                    return parentNode.ChildNodes;                }                else                    return null;            }            catch (Exception ex)            {                throw ex;            }        }                #endregion        #region 获取节点数据集        /// <summary>        /// 根据Xml文件的节点路径，返回一个DataSet数据集        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <returns></returns>        public DataSet GetDataSet(string xpath)        {            DataSet ds = new DataSet();            try            {                System.IO.StringReader read=new System.IO.StringReader(this.SelectSingleNode(xpath).OuterXml);                ds.ReadXml(read);   //利用DataSet的ReadXml方法读取StringReader文件流                read.Close();            }            catch(Exception ex)            {                throw ex;            }            return ds;        }        #endregion        #region 查询节点属性        /// <summary>        /// 返回无重名节点属性值        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="attributeName">属性名称</param>        /// <returns></returns>        public string SelectAttribute(string xpath, string attributeName)        {            try            {                return this.SelectSingleNode(xpath).Attributes[attributeName].Value;            }            catch(Exception ex)            {                throw ex;            }                    }        /// <summary>        /// 返回节点属性值，重名时用，用子节点确定父节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="attributeName">属性名称</param>        /// <param name="level">返回父节点级数，默认一级</param>        /// <returns></returns>        public string SelectParentNodeAttribute(string xpath, string attributeName,int level=1)        {            try            {                return this.SelectParentSingleNode(xpath,level).Attributes[attributeName].Value;            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 查询节点InnerText        /// <summary>        /// 返回无重名节点InnerText        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <returns></returns>        public string SelectInnerText(string xpath)        {            try            {                return this.SelectSingleNode(xpath).InnerText;            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 返回节点InnerText，重名时用，通过子节点确定父节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="level">返回父节点级数，默认一级</param>        /// <returns></returns>        public string SelectParentNodeInnerText(string xpath, int level = 1)        {            try            {                return this.SelectParentSingleNode(xpath,level).InnerText;            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 根据属性值查询节点        /// <summary>        /// 查询具有某个属性名称和值的特定路径节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="attributeName">属性Name</param>        /// <param name="attributeValue">属性Value</param>        /// <returns>存在返回该节点，不存在返回空</returns>        public XmlNode FindNode(string xpath, string attributeName, string attributeValue)        {            try            {                XmlNode node = this.SelectSingleNode(xpath);                if (node != null)                {                    node = node.ParentNode;                    XmlNodeList childNodes = node.ChildNodes;                    string nodeName = xpath.Substring(xpath.LastIndexOf('/') + 1);                    foreach (XmlNode childNode in childNodes)                    {                        if (childNode.Name.Equals(nodeName) && childNode.Attributes[attributeName].Value.Equals(attributeValue))                            return childNode;                    }                }                return null;            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 根据InnerText查询节点        /// <summary>        /// 查询具有某个InnerText的特定路径节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="innerText">InnerText值</param>        /// <returns>存在返回该节点，不存在返回空</returns>        public XmlNode FindNode(string xpath, string innerText)        {            try            {                XmlNode node = this.SelectSingleNode(xpath);                if (node != null)                {                    node = node.ParentNode;                    XmlNodeList childNodes = node.ChildNodes;                    string nodeName = xpath.Substring(xpath.LastIndexOf('/') + 1);                    foreach (XmlNode childNode in childNodes)                    {                        if (childNode.Name.Equals(nodeName) && childNode.InnerText.Equals(innerText))                            return childNode;                    }                }                return null;            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 更新或新增节点InnerText        /// <summary>        /// 更新或新增某个节点的InnerText        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="innerText">InnerText值</param>        public void SaveOrUpdate(string xpath, string innerText)        {            try            {                XmlNode node = this.SelectSingleNode(xpath);                if (node == null)                {                    int lastIndex = xpath.LastIndexOf('/');                    string parentNodePath = xpath.Substring(0, lastIndex);                    node = this.SelectSingleNode(parentNodePath);                    string childNodeName = xpath.Substring(lastIndex + 1);                    if (node != null)                    {                        XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName);  //创建XmlElement对象                        node.AppendChild(objChildNode);                        objChildNode.InnerText = innerText;                    }                }                else                    node.InnerText = innerText;            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 更新无重名节点InnerText        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="Content">InnerText</param>        /// <returns></returns>        public bool UpdateInnerText(string xpath, string innerText)        {            try            {                XmlNode node = this.SelectSingleNode(xpath);                if (node != null)                    node.InnerText = innerText;                else                     return false;                return true;            }            catch(Exception ex)            {                throw ex;            }        }        #endregion        #region 批量更新节点InnerText        /// <summary>        /// 批量添加节点及InnerText，先删除父节点所有孩子        /// 如果无孩子节点，则寻找第一复合父节点名称的节点创建孩子节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="innerTexts">InnerText集合</param>        /// <param name="level">返回父节点级数，默认一级</param>        public void UpdateInnerTexts(string xpath, string[] innerTexts,int level=1)        {            try            {                XmlNode node = this.SelectParentSingleNode(xpath, level);                if (node == null) node = this.SelectSingleNode(xpath.Substring(0, xpath.LastIndexOf('/')));                if (node != null)                {                    this.UpdateInnerTexts(node, xpath.Substring(xpath.LastIndexOf('/') + 1), innerTexts);                }            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 批量添加节点及InnerText，先删除父节点所有孩子        /// </summary>        /// <param name="parentNode">父节点</param>        /// <param name="childNodeName">孩子节点Name</param>        /// <param name="innerTexts">InnerText值</param>        public void UpdateInnerTexts(XmlNode parentNode,string childNodeName, string[] innerTexts)        {            if (parentNode != null)            {                if (parentNode.HasChildNodes)                {                    parentNode.RemoveAll();                }                foreach (string innerText in innerTexts)                {                    XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName);  //创建XmlElement对象                    parentNode.AppendChild(objChildNode);                    objChildNode.InnerText = innerText;                }            }        }         #endregion        #region 更新或新增节点属性        /// <summary>        /// 更新或新增某个节点的属性们        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="keyName">主键Name</param>        /// <param name="keyValue">主键值</param>        /// <param name="attributeNames">属性名称集合</param>        /// <param name="attributeValues">属性值集合</param>        public void SaveOrUpdate(string xpath, string keyName,string keyValue,string[] attributeNames,string[] attributeValues)        {            try            {                XmlNode node = this.FindNode(xpath, keyName, keyValue);                if (node == null)                {                    int lastIndex = xpath.LastIndexOf('/');                    string parentNodePath = xpath.Substring(0, lastIndex);                    node = this.SelectSingleNode(parentNodePath);                    string childNodeName = xpath.Substring(lastIndex + 1);                    if (node != null)                    {                        XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName);  //创建XmlElement对象                        node.AppendChild(objChildNode);                        for (int i = 0; i < attributeValues.Length; i++)                        {                            objChildNode.SetAttribute(attributeNames[i], attributeValues[i]);                        }                    }                }                else                {                    for (int i = 0; i < attributeValues.Length; i++)                    {                        node.Attributes[attributeNames[i]].Value = attributeValues[i];                    }                }            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 新增带属性的节点，不考虑父节点是否存在        /// </summary>        /// <param name="xpath"></param>        /// <param name="attributeNames"></param>        /// <param name="attributeValues"></param>        public XmlNode InsertNode(string xpath, string[] attributeNames, string[] attributeValues)        {            try            {                int lastIndex = xpath.LastIndexOf('/');                XmlNode node = this.SelectParentSingleNode(xpath);                string childNodeName = xpath.Substring(lastIndex + 1);                if (node != null)                {                    XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName,node.NamespaceURI);  //创建XmlElement对象                    node.AppendChild(objChildNode);                    for (int i = 0; i < attributeValues.Length; i++)                    {                        objChildNode.SetAttribute(attributeNames[i], attributeValues[i]);                    }                    return (XmlNode)objChildNode;                }                return null;            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 新增带属性的节点，不考虑父节点是否存在        /// </summary>        /// <param name="xpath"></param>        /// <param name="attributeNames"></param>        /// <param name="attributeValues"></param>        public void InsertNode(XmlNode node,string childNodeName, string[] attributeNames, List<List<string>> attributeValues)        {            try            {                foreach (List<string> values in attributeValues)                {                    XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName, node.NamespaceURI);  //创建XmlElement对象                    node.AppendChild(objChildNode);                    for (int i = 0; i < attributeNames.Length; i++)                    {                        objChildNode.SetAttribute(attributeNames[i], values[i]);                    }                }                          }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 批量更新节点属性和属性值        /// <summary>        /// 批量添加节点及InnerText，先删除父节点所有孩子        /// 如果无孩子节点，则寻找第一复合父节点名称的节点创建孩子节点        /// </summary>        /// <param name="xpath">格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="attributeNames">属性名称集合</param>        /// <param name="attributeNames">属性值集合</param>        /// <param name="level">返回父节点级数，默认一级</param>        public void UpdateAttributes(string xpath, string[] attributeNames,string[] attributeValues, int level = 1)        {            try            {                XmlNode node = this.SelectParentSingleNode(xpath, level);                if (node == null) node = this.SelectSingleNode(xpath.Substring(0, xpath.LastIndexOf('/')));                if (node != null)                {                    this.UpdateAttributes(node, xpath.Substring(xpath.LastIndexOf('/') + 1), attributeNames, attributeValues);                }            }            catch (Exception ex)            {                throw ex;            }        }        /// <summary>        /// 批量添加节点及InnerText，先删除父节点所有孩子        /// </summary>        /// <param name="parentNode">父节点</param>        /// <param name="childNodeName">孩子节点Name</param>        /// <param name="attributeNames">属性名称集合</param>        /// <param name="attributeNames">属性值集合</param>        public void UpdateAttributes(XmlNode parentNode, string childNodeName, string[] attributeNames, string[] attributeValues)        {            if (parentNode != null)            {                if (parentNode.HasChildNodes)                {                    parentNode.RemoveAll();                }                for (int i = 0; i < attributeNames.Length;i++ )                {                    XmlElement objChildNode = _xmlDoc.CreateElement(childNodeName);  //创建XmlElement对象                    parentNode.AppendChild(objChildNode);                    objChildNode.SetAttribute(attributeNames[i], attributeValues[i]);                }            }        }        #endregion        #region 节点转换为模型        /// <summary>        /// 节点转换为模型实例        /// </summary>        /// <typeparam name="T">模型类型</typeparam>        /// <param name="node">节点</param>        /// <param name="names">字段名称集合</param>        /// <returns></returns>        public T Convert<T>(XmlNode node,string[] names) where T: new()        {            T t = new T();            Type type=t.GetType();            foreach (string name in names)            {                PropertyInfo propertyInfo = type.GetProperty(name);                if (propertyInfo != null)                {                    propertyInfo.SetValue(t, node.Attributes[name].Value, null);                }            }            return t;        }        /// <summary>        /// 保存实体为带属性的节点        /// </summary>        /// <param name="entity">实体实例</param>        /// <param name="xpath">包含最底层节点名称，格式：顶级节点名称/下级节点名称/下级节点名称</param>        /// <param name="keyName">主键属性名称</param>        /// <param name="keyValue">主键属性值</param>        /// <param name="atrributeMames">属性名称集合，包含主键</param>        public void SaveNode(object entity, string xpath, string keyName, string keyValue, string[] atrributeMames)        {            List<string> atrributeValues = new List<string>();            Type type = entity.GetType();            foreach (string name in atrributeMames)            {                PropertyInfo property = type.GetProperty(name);                if (property != null)                {                    atrributeValues.Add(System.Convert.ToString(property.GetValue(entity, null)));                }            }            this.SaveOrUpdate(xpath, keyName, keyValue, atrributeMames, atrributeValues.ToArray());        }        #endregion    }}