XML的文件解析类————比较常用



/// <summary>

/// Author: jiangxiaoqiang

/// </summary>

public class XmlReader

{

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#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

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#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 attrName)

{

if (parentXmlNode == null || string .IsNullOrEmpty(childNodeName) || string .IsNullOrEmpty(attrName))

{

return null ;

}

var xpathExpr = string .Format( "//{0}[@{1}]" ,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

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#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

//========================================================= //

}