基于C#实现XML文件读取工具类

/// <summary>/// Author: jiangxiaoqiang/// </summary>public class XmlReader{  //========================================================= //  #region 获取XmlDocument对象  /// <summary>  /// 根据XML文件内容获取XmlDocument对象  /// </summary>  /// <param name="xmlFileContent"></param>  /// <returns></returns>  public static XmlDocument GetXmlDocByXmlContent(string xmlFileContent)  {    if (string.IsNullOrEmpty(xmlFileContent))    {      return null;    }    var xDoc = new XmlDocument();    try    {      xDoc.LoadXml(xmlFileContent);    }    catch    {      xDoc = null;    }    return xDoc;  }  /// <summary>  /// 根据XML文件路径获取XmlDocument对象  /// </summary>  /// <param name="xmlFilePath"></param>  /// <returns></returns>  public static XmlDocument GetXmlDocByFilePath(string xmlFilePath)  {    if (string.IsNullOrEmpty(xmlFilePath) || !File.Exists(xmlFilePath))    {      return null;    }    var xDoc = new XmlDocument();    try    {      xDoc.Load(xmlFilePath);    }    catch    {      throw new Exception(string.Format("请确认该XML文件格式正确，路径为：{0}", xmlFilePath));    }    return xDoc;  }  #endregion  //========================================================= //  //========================================================= //  #region 获取XML节点（或节点列表）  /// <summary>  /// 获取父节点下指定节点名称的第一个子节点  /// </summary>  /// <param name="parentXmlNode"></param>  /// <param name="childNodeName"></param>  /// <returns></returns>  public static XmlNode GetFirstChildNodeByName(XmlNode parentXmlNode, string childNodeName)  {    var childXmlNodes = GetChildNodesByName(parentXmlNode, childNodeName);    if (childXmlNodes != null && childXmlNodes.Count > 0)    {      return childXmlNodes[0];    }    return null;  }  /// <summary>  /// 获取父节点下指定节点名称的子节点列表  /// </summary>  /// <param name="parentXmlNode">父节点</param>  /// <param name="nodeName">节点名称</param>  /// <returns></returns>  public static XmlNodeList GetChildNodesByName(XmlNode parentXmlNode, string nodeName)  {    if (parentXmlNode == null || string.IsNullOrEmpty(nodeName))    {      return null;    }    return GetChildNodesByXPathExpr(parentXmlNode, string.Format(".//{0}", nodeName));  }  /// <summary>  /// 获取父节点下满足xpathExpr表达式的XML子节点列表  /// </summary>  /// <param name="parentXmlNode">父节点</param>  /// <param name="xpathExpr"></param>  /// <returns></returns>    public static XmlNodeList GetChildNodesByXPathExpr(XmlNode parentXmlNode, string xpathExpr)  {    if (parentXmlNode == null || string.IsNullOrEmpty(xpathExpr))    {      return null;    }    return parentXmlNode.SelectNodes(xpathExpr);  }  /// <summary>  /// 获取父节点下的第一个子节点  /// </summary>  /// <param name="parentXmlNode"></param>  /// <returns></returns>  public static XmlNode GetFirstChildNode(XmlNode parentXmlNode)  {    var childXmlNodes = GetChildNodes(parentXmlNode);    if (childXmlNodes != null && childXmlNodes.Count > 0)    {      return childXmlNodes[0];    }    return null;  }  /// <summary>  /// 获取父节点的子节点列表  /// </summary>  /// <param name="parentXmlNode">父节点</param>  /// <returns></returns>  public static XmlNodeList GetChildNodes(XmlNode parentXmlNode)  {    return parentXmlNode == null ? null : parentXmlNode.ChildNodes;  }  #endregion  //========================================================= //  //========================================================= //  #region 读取节点属性值  /// <summary>  /// 读取某个XML节点的属性值（根据属性名）  /// </summary>  /// <param name="xmlNode"></param>  /// <param name="attrName"></param>  /// <returns></returns>  public static string ReadAttrValue(XmlNode xmlNode, string attrName)  {    var xmlElement = xmlNode as XmlElement;    return xmlElement == null ? null : xmlElement.GetAttribute(attrName);  }  /// <summary>  /// 读取父节点下指定节点名和属性名的第一个子节点的属性值  /// </summary>  /// <param name="parentXmlNode">XML父节点</param>  /// <param name="childNodeName">节点名称</param>  /// <param name="attrName">属性名</param>  /// <returns></returns>  public static string ReadFirstAttrValue(XmlNode parentXmlNode, string childNodeName, string attrName)  {    var attrVals = ReadAttrValues(parentXmlNode, childNodeName, attrName);    return (attrVals == null || attrVals.Length == 0) ? null : attrVals[0];  }  /// <summary>  /// 读取父节点下指定节点名和属性名的所有子节点的该属性值的数组  /// </summary>  /// <param name="parentXmlNode">XML文档</param>  /// <param name="childNodeName">节点名称</param>  /// <param name="attrName">属性名</param>  /// <returns></returns>  public static string[] ReadAttrValues(XmlNode parentXmlNode, string childNodeName, string attrName)  {    if (parentXmlNode == null || string.IsNullOrEmpty(childNodeName) || string.IsNullOrEmpty(attrName))    {      return null;    }    var xpathExpr = string.Format("//{0}[@{1}]", childNodeName, attrName);    var nodes = GetChildNodesByXPathExpr(parentXmlNode, xpathExpr);    if (nodes != null && nodes.Count > 0)    {      var nodeCount = nodes.Count;      var attrVals = new string[nodeCount];      for (var i = 0; i < nodeCount; i++)      {        attrVals[i] = ((XmlElement)nodes[i]).GetAttribute(attrName);      }      return attrVals;    }    return null;  }  #endregion  //========================================================= //  //========================================================= //  #region 读取父节点下的子节点的文本内容  /// <summary>  /// 读取父节点下指定节点名的第一个子节点的文本  /// </summary>  /// <param name="parentXmlNode"></param>  /// <param name="childNodeName"></param>  /// <returns></returns>  public static string ReadFirstChildNodeTextByName(XmlNode parentXmlNode, string childNodeName)  {    var childNodeTexts = ReadChildNodeTextsByName(parentXmlNode, childNodeName);    if (childNodeTexts != null && childNodeTexts.Length > 0)    {      return childNodeTexts[0];    }    return null;  }  /// <summary>  /// 读取父节点下指定节点名的所有子节点的文本数组  /// </summary>  /// <param name="parentXmlNode"></param>  /// <param name="childNodeName"></param>  /// <returns></returns>  public static string[] ReadChildNodeTextsByName(XmlNode parentXmlNode, string childNodeName)  {    if (parentXmlNode == null || string.IsNullOrEmpty(childNodeName))    {      return null;    }    var xpathExpr = string.Format(".//{0}", childNodeName);    var childNodes = GetChildNodesByXPathExpr(parentXmlNode, xpathExpr);    if (childNodes != null && childNodes.Count > 0)    {      var nodeCount = childNodes.Count;      var nodeTexts = new string[nodeCount];      for (var i = 0; i < nodeCount; i++)      {        nodeTexts[i] = childNodes[i].InnerText;      }      return nodeTexts;    }    return null;  }  /// <summary>  /// 读取父节点下的第一个子节点的文本  /// </summary>  /// <param name="parentXmlNode"></param>  /// <returns></returns>  public static string ReadFirstChildNodeText(XmlNode parentXmlNode)  {    var childNodeTexts = ReadChildNodeTexts(parentXmlNode);    if (childNodeTexts != null && childNodeTexts.Length > 0)    {      return childNodeTexts[0];    }    return null;  }  /// <summary>  /// 读取父节点下的所有子节点的文本数组  /// </summary>  /// <param name="parentXmlNode"></param>  /// <returns></returns>  public static string[] ReadChildNodeTexts(XmlNode parentXmlNode)  {    if (parentXmlNode == null)    {      return null;    }    var childNodes = GetChildNodes(parentXmlNode);    if (childNodes != null && childNodes.Count > 0)    {      var nodeCount = childNodes.Count;      var nodeTexts = new string[nodeCount];      for (var i = 0; i < nodeCount; i++)      {        nodeTexts[i] = childNodes[i].InnerText;      }      return nodeTexts;    }    return null;  }  /// <summary>  /// 读取XML节点文本  /// </summary>  /// <param name="xmlNode"></param>  /// <returns></returns>  public static string ReadNodeText(XmlNode xmlNode)  {    if (xmlNode == null)    {      return null;    }    return xmlNode.InnerText;  }  #endregion  //========================================================= //}