/// <summary>/// Author: jiangxiaoqiang/// </summary>public class XmlReader{  //========================================================= //  #region 獲取XmlDocument對象  /// <summary>  /// 根據XML文件內容獲取XmlDocument對象  /// </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>  /// 根據XML文件路徑獲取XmlDocument對象  /// </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("請確認該XML文件格式正確，路徑為：{0}", xmlFilePath));    }    return xDoc;  }  #endregion  //========================================================= //  //========================================================= //  #region 獲取XML節點（或節點列表）  /// <summary>  /// 獲取父節點下指定節點名稱的第一個子節點  /// </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>  /// 獲取父節點下指定節點名稱的子節點列表  /// </summary>  /// <param name="parentXmlNode">父節點</param>  /// <param name="nodeName">節點名稱</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>  /// 獲取父節點下滿足xpathExpr表達式的XML子節點列表  /// </summary>  /// <param name="parentXmlNode">父節點</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>  /// 獲取父節點下的第一個子節點  /// </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>  /// 獲取父節點的子節點列表  /// </summary>  /// <param name="parentXmlNode">父節點</param>  /// <returns></returns>  public static XmlNodeList GetChildNodes(XmlNode parentXmlNode)  {    return parentXmlNode == null ? null : parentXmlNode.ChildNodes;  }  #endregion  //========================================================= //  //========================================================= //  #region 讀取節點屬性值  /// <summary>  /// 讀取某個XML節點的屬性值（根據屬性名）  /// </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>  /// 讀取父節點下指定節點名和屬性名的第一個子節點的屬性值  /// </summary>  /// <param name="parentXmlNode">XML父節點</param>  /// <param name="childNodeName">節點名稱</param>  /// <param name="attrName">屬性名</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>  /// 讀取父節點下指定節點名和屬性名的所有子節點的該屬性值的數組  /// </summary>  /// <param name="parentXmlNode">XML文檔</param>  /// <param name="childNodeName">節點名稱</param>  /// <param name="attrName">屬性名</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("http://{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 讀取父節點下的子節點的文本內容  /// <summary>  /// 讀取父節點下指定節點名的第一個子節點的文本  /// </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>  /// 讀取父節點下指定節點名的所有子節點的文本數組  /// </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>  /// 讀取父節點下的第一個子節點的文本  /// </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>  /// 讀取父節點下的所有子節點的文本數組  /// </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>  /// 讀取XML節點文本  /// </summary>  /// <param name="xmlNode"></param>  /// <returns></returns>  public static string ReadNodeText(XmlNode xmlNode)  {    if (xmlNode == null)    {      return null;    }    return xmlNode.InnerText;  }  #endregion  //========================================================= //}