日期:2011-04-24  浏览次数:20486 次

//
//bool XmlTextReader.Read(): 读取流中下一个节点,当读完最后一个节点再次调用该方法该方法返回false
//XmlNodeType XmlTextReader.NodeType: 该属性返回当前节点的类型
// XmlNodeType.Element 元素节点
// XmlNodeType.EndElement 结尾元素节点
// XmlNodeType.XmlDeclaration 文档的第一个节点
// XmlNodeType.Text 文本节点
//bool XmlTextReader.HasAttributes: 当前节点有没有属性,返回true或false
//string XmlTextReader.Name: 返回当前节点的名称
//string XmlTextReader.Value: 返回当前节点的值
//string XmlTextReader.LocalName: 返回当前节点的本地名称
//string XmlTextReader.NamespaceURI: 返回当前节点的命名空间URI
//string XmlTextReader.Prefix: 返回当前节点的前缀
//bool XmlTextReader.MoveToNextAttribute(): 移动到当前节点的下一个属性
//---------------------------------------------------------------------------------------------------

namespace XMLReading
{
using System;
using System.Xml;
using System.Windows.Forms;
using System.ComponentModel;

/// <summary>
/// Xml文件读取器
/// </summary>

public class XmlReader : IDisposable
{
private string _xmlPath;
private const string _errMsg = "Error Occurred While Reading ";
private ListBox _listBox;
private XmlTextReader xmlTxtRd;

#region XmlReader 的构造器

public XmlReader()
{
this._xmlPath = string.Empty;
this._listBox = null;
this.xmlTxtRd = null;
}

/// <summary>
/// 构造器
/// </summary>
/// <param name="_xmlPath">xml文件绝对路径</param>
/// <param name="_listBox">列表框用于显示xml</param>

public XmlReader(string _xmlPath, ListBox _listBox)
{
this._xmlPath = _xmlPath;
this._listBox = _listBox;
this.xmlTxtRd = null;
}

#endregion
#region XmlReader 的资源释放方法

/// <summary>
/// 清理该对象所有正在使用的资源

/// </summary>

public void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}

/// <summary>
/// 释放该对象的实例变量
/// </summary>
/// <param name="disposing"></param>

protected virtual void Dispose(bool disposing)
{
if (!disposing)
return;
if (this.xmlTxtRd != null)
{
this.xmlTxtRd.Close();
this.xmlTxtRd = null;
}

if (this._xmlPath != null)
{
this._xmlPath = null;
}
}

#endregion
#region XmlReader 的属性

/// <summary>
/// 获取或设置列表框用于显示xml
/// </summary>

public ListBox listBox
{
get
{
return this._listBox;
}
set
{
this._listBox = value;
}
}

/// <summary>
/// 获取或设置xml文件的绝对路径
/// </summary>

public string xmlPath
{
get
{
return this._xmlPath;
}
set
{
this._xmlPath = value;
}
}

#endregion

/// <summary>
/// 遍历Xml文件
/// </summary>

public void EachXml()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
this._listBox.Items.Add(this.xmlTxtRd.Value);
}
}
catch(XmlException exp)
{
throw new XmlException(_errMsg + this._xmlPath + exp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// <summary>
/// 读取Xml文件的节点类型
/// </summary>

public void ReadXmlByNodeType()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
this._listBox.Items.Add(this.xmlTxtRd.NodeType.ToString());
}
}
catch(XmlException exp)
{
throw new XmlException(_errMsg + this._xmlPath + exp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// <summary>
/// 根据节点类型过滤Xml文档
/// </summary>
/// <param name="xmlNType">XmlNodeType 节点类型的数组</param>

public void FilterByNodeType(XmlNodeType[] xmlNType)
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this.