/// <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//========================================================= //
}