C#对一个XML操作的实用类

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Data;
using System.IO;

namespace eBlog.Common.Files
{
public class XmlHelper
{
protected string strXmlFile;
protected XmlDocument objXmlDoc = new XmlDocument();

/// <summary>
/// 初始化xml操作类,XmlFile需要绝对路径Server.MapPath(),若文件不存在自动创建
/// </summary>
/// <param name="XmlFile"></param>
public XmlHelper(string XmlFile)
{
try
{
if (!File.Exists(XmlFile))
{
CreatXmlFile(XmlFile);

}
objXmlDoc.Load(XmlFile);

}
catch (System.Exception ex)
{
throw ex;
}
strXmlFile = XmlFile;
}


public void CreatXmlFile(string file)
{
XmlTextWriter writer = new
XmlTextWriter(file, Encoding.UTF8);
// start writing!
writer.WriteStartDocument();
writer.WriteStartElement("Root");
writer.WriteEndElement();
writer.WriteEndDocument();
writer.Close();
}

/// <summary>
/// 保存文件
/// </summary>
public void Save()
{
//保存文件。 
try
{
objXmlDoc.Save(strXmlFile);
}
catch (System.Exception ex)
{
throw ex;
}
objXmlDoc = null;
}


/// <summary>
/// 更新节点内容
/// </summary>
/// <param name="xmlPathNode"></param>
/// <param name="content"></param>
public void Replace(string xmlPathNode, string content)
{
//更新节点内容。 
// ReSharper disable PossibleNullReferenceException
if (xmlPathNode != null) objXmlDoc.SelectSingleNode(xmlPathNode).InnerText = content;
// ReSharper restore PossibleNullReferenceException
}

/// <summary>
/// 删除一个节点
/// </summary>
/// <param name="node"></param>
public void Delete(string node)
{
//删除一个节点。 
string mainNode = node.Substring(0, node.LastIndexOf("/"));
objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(node));
}
/// <summary>
/// 插入一个节点和此节点的一子节点
/// </summary>
/// <param name="MainNode"></param>
/// <param name="ChildNode"></param>
/// <param name="Element"></param>
/// <param name="Content"></param>
public void InsertNode(string MainNode, string ChildNode, string Element, string Content)
{
//插入一个节点和此节点的一子节点。 
XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
objRootNode.AppendChild(objChildNode);
XmlElement objElement = objXmlDoc.CreateElement(Element);
objElement.InnerText = Content;
objChildNode.AppendChild(objElement);
}
/// <summary>
/// 插入一个节点,带一属性
/// </summary>
/// <param name="MainNode"></param>
/// <param name="Element"></param>
/// <param name="Attrib"></param>
/// <param name="AttribContent"></param>
/// <param name="Content"></param>
public void InsertElement(string MainNode, string Element, string Attrib, string AttribContent, string Content)
{
//插入一个节点,带一属性。 
XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
XmlElement objElement = objXmlDoc.CreateElement(Element);
objElement.SetAttribute(Attrib, AttribContent);
objElement.InnerText = Content;
objNode.AppendChild(objElement);
}
/// <summary>
/// 插入一个节点,不带属性
/// </summary>
/// <param name="MainNode"></param>
/// <param name="Element"></param>
/// <param name="Content"></param>
public void InsertElement(string MainNode, string Element, string Content)
{
XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
XmlElement objElement = objXmlDoc.CreateElement(Element);
objElement.InnerText = Content;
objNode.AppendChild(objElement);
}

 


#region xml操作 静态方法组=============
/// <summary>
/// 读取数据
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">节点</param>
/// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param>
/// <returns>string</returns>
/**************************************************
* 使用示列:
* XmlHelper.Read(path, "/Node", "")
* XmlHelper.Read(path, "/Node/Element[@Attribute=‘Name‘]", "Attribute")
************************************************/
public static string Read(string path, string node, string attribute)
{
if (path != "" && path.IndexOf(":") < 0) { path = System.Web.HttpContext.Current.Server.MapPath(path); }

string value = "";
try
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);
}
catch { }
return value;
}

/// <summary>
/// 插入数据
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">节点</param>
/// <param name="element">元素名，非空时插入新元素，否则在该元素中插入属性</param>
/// <param name="attribute">属性名，非空时插入该元素属性值，否则插入元素值</param>
/// <param name="value">值</param>
/// <returns></returns>
/**************************************************
* 使用示列:
* XmlHelper.Insert(path, "/Node", "Element", "", "Value")
* XmlHelper.Insert(path, "/Node", "Element", "Attribute", "Value")
* XmlHelper.Insert(path, "/Node", "", "Attribute", "Value")
************************************************/
public static void Insert(string path, string node, string element, string attribute, string value)
{
try
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
if (element.Equals(""))
{
if (!attribute.Equals(""))
{
XmlElement xe = (XmlElement)xn;
xe.SetAttribute(attribute, value);
}
}
else
{
XmlElement xe = doc.CreateElement(element);
if (attribute.Equals(""))
xe.InnerText = value;
else
xe.SetAttribute(attribute, value);
xn.AppendChild(xe);
}
doc.Save(path);
}
catch { }
}

/// <summary>
/// 修改数据
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">节点</param>
/// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param>
/// <param name="value">值</param>
/// <returns></returns>
/**************************************************
* 使用示列:
* XmlHelper.Insert(path, "/Node", "", "Value")
* XmlHelper.Insert(path, "/Node", "Attribute", "Value")
************************************************/
public static void Update(string path, string node, string attribute, string value)
{
try
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
XmlElement xe = (XmlElement)xn;
if (attribute.Equals(""))
xe.InnerText = value;
else
xe.SetAttribute(attribute, value);
doc.Save(path);
}
catch { }
}

/// <summary>
/// 删除数据
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">节点</param>
/// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param>
/// <param name="value">值</param>
/// <returns></returns>
/**************************************************
* 使用示列:
* XmlHelper.Delete(path, "/Node", "")
* XmlHelper.Delete(path, "/Node", "Attribute")
************************************************/
public static void Delete(string path, string node, string attribute)
{
try
{
XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
XmlElement xe = (XmlElement)xn;
if (attribute.Equals(""))
xn.ParentNode.RemoveChild(xn);
else
xe.RemoveAttribute(attribute);
doc.Save(path);
}
catch { }
}

#endregion ==========

 

}

}