XML的基本操作

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;

//引用命名空间
using System.Xml;

namespace xmlOp
{
/// <summary>
/// XmlOp类提供对XML数据库的读写
/// </summary>
public class XmlOp
{
//声明一个XmlDocument空对象
protected XmlDocument XmlDoc = new XmlDocument();

/// <summary>
/// 构造函数，导入Xml文件
/// </summary>
/// <param name="xmlFile">文件虚拟路径</param>
public XmlOp(string xmlFile)
{
try
{
XmlDoc.Load(GetXmlFilePath(xmlFile)); //载入Xml文档
}
catch (System.Exception ex)
{
throw ex;
}
}
/// <summary>
/// 析构函数
/// </summary>
~XmlOp()
{
XmlDoc = null; //释放XmlDocument对象
}

/// <summary>
/// 保存文件
/// </summary>
/// <param name="filePath">文件虚拟路径</param>
public void Save(string filePath)
{
try
{
XmlDoc.Save(GetXmlFilePath(filePath));
}
catch (System.Exception ex)
{
throw ex;
}
}

/// <summary>
/// 返回Xml文件实际路径
/// </summary>
/// <param name="xmlFile">文件虚拟路径</param>
/// <returns></returns>
public string GetXmlFilePath(string xmlFile)
{
return HttpContext.Current.Server.MapPath(xmlFile);
}

/// <summary>
/// 根据Xml文件的节点路径，返回一个DataSet数据集
/// </summary>
/// <param name="XmlPathNode">Xml文件的某个节点</param>
/// <returns></returns>
public DataSet GetDs(string XmlPathNode)
{
DataSet ds = new DataSet();
try
{
System.IO.StringReader read = new System.IO.StringReader(XmlDoc.SelectSingleNode(XmlPathNode).OuterXml);
ds.ReadXml(read); //利用DataSet的ReadXml方法读取StringReader文件流
read.Close();
}
catch
{ }
return ds;
}

/// <summary>
/// 属性查询，返回属性值
/// </summary>
/// <param name="XmlPathNode">属性所在的节点</param>
/// <param name="Attrib">属性</param>
/// <returns></returns>
public string SelectAttrib(string XmlPathNode, string Attrib)
{
string _strNode="";
try
{
_strNode = XmlDoc.SelectSingleNode(XmlPathNode).Attributes[Attrib].Value;
}
catch
{ }
return _strNode;
}

/// <summary>
/// 节点查询，返回节点值
/// </summary>
/// <param name="XmlPathNode">节点的路径</param>
/// <returns></returns>
public string SelectNodeText(string XmlPathNode)
{
string _nodeTxt = XmlDoc.SelectSingleNode(XmlPathNode).InnerText;
if (_nodeTxt == null || _nodeTxt == "")
return "";
else
return _nodeTxt;
}

/// <summary>
/// 节点值查询判断
/// </summary>
/// <param name="XmlPathNode">父节点</param>
/// <param name="index">节点索引</param>
/// <param name="NodeText">节点值</param>
/// <returns></returns>
public bool SelectNode(string XmlPathNode, int index, string NodeText)
{
try
{
XmlNodeList _NodeList = XmlDoc.SelectNodes(XmlPathNode);
//循环遍历节点，查询是否存在该节点
for (int i = 0; i < _NodeList.Count; i++)
{
if (_NodeList[i].ChildNodes[index].InnerText == NodeText)
{
return true;
break;
}
}
}
catch
{
}
return false;
}

/// <summary>
/// 获取子节点个数
/// </summary>
/// <param name="XmlPathNode">父节点</param>
/// <returns></returns>
public int NodeCount(string XmlPathNode)
{
int i = 0;
try
{
i=XmlDoc.SelectSingleNode(XmlPathNode).ChildNodes.Count;
}
catch
{
i=0;
}
return i;
}

/// <summary>
/// 更新一个节点的内容
/// </summary>
/// <param name="XmlPathNode">节点的路径</param>
/// <param name="Content">新的节点值</param>
/// <returns></returns>
public bool UpdateNode(string XmlPathNode,string NodeContent)
{
try
{
XmlDoc.SelectSingleNode(XmlPathNode).InnerText = NodeContent;
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 更新N个节点值
/// </summary>
/// <param name="XmlParentNode">父节点</param>
/// <param name="XmlNode">子节点</param>
/// <param name="NodeContent">子节点内容</param>
/// <returns></returns>
public bool UpdateNode(string XmlParentNode, string[] XmlNode, string[] NodeContent)
{
try
{
//根据节点数组循环修改节点值
for (int i = 0; i < XmlNode.Length; i++)
{
XmlDoc.SelectSingleNode(XmlParentNode+"/"+XmlNode[i]).InnerText = NodeContent[i];
}
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 修改属性
/// </summary>
/// <param name="XmlPathNode">属性所在的节点</param>
/// <param name="Attrib">属性名</param>
/// <param name="Content">属性值</param>
/// <returns></returns>
public bool UpdateAttrib(string XmlPathNode, string Attrib,string AttribContent)
{
try
{
//修改属性值
XmlDoc.SelectSingleNode(XmlPathNode).Attributes[Attrib].Value = AttribContent;
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 添加属性
/// </summary>
/// <param name="MainNode">属性所在节点</param>
/// <param name="Attrib">属性名</param>
/// <param name="AttribContent">属性值</param>
/// <returns></returns>
public bool InsertAttrib(string MainNode,string Attrib, string AttribContent)
{
try
{
XmlElement objNode = (XmlElement)XmlDoc.SelectSingleNode(MainNode); //强制转化成XmlElement对象
objNode.SetAttribute(Attrib, AttribContent); //XmlElement对象添加属性方法
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 插入一个节点，带N个子节点
/// </summary>
/// <param name="MainNode">插入节点的父节点</param>
/// <param name="ChildNode">插入节点的元素名</param>
/// <param name="Element">插入节点的子节点名数组</param>
/// <param name="Content">插入节点的子节点内容数组</param>
/// <returns></returns>
public bool InsertNode(string MainNode, string ChildNode, string[] Element, string[] Content)
{
try
{
XmlNode objRootNode = XmlDoc.SelectSingleNode(MainNode); //声明XmlNode对象
XmlElement objChildNode = XmlDoc.CreateElement(ChildNode); //创建XmlElement对象
objRootNode.AppendChild(objChildNode);
for (int i = 0; i < Element.Length; i++) //循环插入节点元素
{
XmlElement objElement = XmlDoc.CreateElement(Element[i]);
objElement.InnerText = Content[i];
objChildNode.AppendChild(objElement);
}
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 删除一个节点
/// </summary>
/// <param name="Node">要删除的节点</param>
/// <returns></returns>
public bool DeleteNode(string Node)
{
try
{
//XmlNode的RemoveChild方法来删除节点及其所有子节点
XmlDoc.SelectSingleNode(Node).ParentNode.RemoveChild(XmlDoc.SelectSingleNode(Node));
return true;
}
catch
{
return false;
}
}
}
}