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[其他] C#读XML文件帮助类

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电梯直达

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发表于 2014-11-25 02:11:56 |只看该作者 |倒序浏览

代码出处：http://www.oschina.net/code/snippet_111708_20735
需要有XPATH基础知识

using System.Xml;

///
/// XML文件读取帮助类
///
public class XmlReaderHelper {

#region 获取XmlDocument对象

///
/// 根据XML文件内容获取XmlDocument对象
///
///
///
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;
}

///
/// 根据XML文件路径获取XmlDocument对象
///
///
///
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）

///
/// 获取父节点下指定节点名称的第一个子节点
///
///
///
///
public static XmlNode GetFirstChildNodeByName ( XmlNode parentXmlNode, string childNodeName ) {
      var childXmlNodes = GetChildNodesByName(parentXmlNode, childNodeName);
      if (childXmlNodes != null && childXmlNodes.Count > 0) {
         return childXmlNodes[0];
      }

      return null;
}

///
/// 获取父节点下指定节点名称的子节点列表
///
/// 父节点
/// 节点名称
///
public static XmlNodeList GetChildNodesByName ( XmlNode parentXmlNode, string nodeName ) {
      if (parentXmlNode == null || string.IsNullOrEmpty(nodeName)) {
         return null;
      }

      return GetChildNodesByXPathExpr(parentXmlNode, string.Format(".//{0}", nodeName));
}

///
/// 获取父节点下满足xpathExpr表达式的XML子节点列表
///
/// 父节点
///
///
public static XmlNodeList GetChildNodesByXPathExpr ( XmlNode parentXmlNode, string xpathExpr ) {
      if (parentXmlNode == null || string.IsNullOrEmpty(xpathExpr)) {
         return null;
      }

      return parentXmlNode.SelectNodes(xpathExpr);
}

///
/// 获取父节点下的第一个子节点
///
///
///
public static XmlNode GetFirstChildNode ( XmlNode parentXmlNode ) {
      var childXmlNodes = GetChildNodes(parentXmlNode);
      if (childXmlNodes != null && childXmlNodes.Count > 0) {
         return childXmlNodes[0];
      }

      return null;
}

///
/// 获取父节点的子节点列表
///
/// 父节点
///
public static XmlNodeList GetChildNodes ( XmlNode parentXmlNode ) {
      return parentXmlNode == null ? null : parentXmlNode.ChildNodes;
}

#endregion

#region 读取节点属性值

///
/// 读取某个XML节点的属性值（根据属性名）
///
///
///
///
public static string ReadAttrValue ( XmlNode xmlNode, string attrName ) {
      var xmlElement = xmlNode as XmlElement;

      return xmlElement == null ? null : xmlElement.GetAttribute(attrName);
}

///
/// 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
///
/// XML父节点
/// 节点名称
/// 属性名
///
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];
}

///
/// 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
///
/// XML文档
/// 节点名称
/// 属性名
///
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

///
/// 读取父节点下指定节点名的第一个子节点的文本
///
///
///
///
public static string ReadFirstChildNodeTextByName ( XmlNode parentXmlNode, string childNodeName ) {
      var childNodeTexts = ReadChildNodeTextsByName(parentXmlNode, childNodeName);
      if (childNodeTexts != null && childNodeTexts.Length > 0) {
         return childNodeTexts[0];
      }

      return null;
}

///
/// 读取父节点下指定节点名的所有子节点的文本数组
///
///
///
///
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;
}

///
/// 读取父节点下的第一个子节点的文本
///
///
///
public static string ReadFirstChildNodeText ( XmlNode parentXmlNode ) {
      var childNodeTexts = ReadChildNodeTexts(parentXmlNode);
      if (childNodeTexts != null && childNodeTexts.Length > 0) {
         return childNodeTexts[0];
      }

      return null;
}

///
/// 读取父节点下的所有子节点的文本数组
///
///
///
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;
}

///
/// 读取XML节点文本
///
///
///
public static string ReadNodeText ( XmlNode xmlNode ) {
      if (xmlNode == null) {
         return null;
      }

      return xmlNode.InnerText;
}

#endregion

}