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本文实例讲述了基于C#实现XML文件读取工具类。分享给大家供大家参考。具体如下：
这是我去年写的一个XML文件读取工具类，现在做了一些调整
基本能满足一般的XML文件读取需求。
更新：
2013年6月26日19:37 Fix了几个Bug，为所有方法添加单元测试，并运行通过；同时调整了几个方法的位置。
/// <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 <