C#.Net操作XML
1,读取Rss订阅XML文件:读取线上的XML
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
namespace XmlTest.com
{
/// <summary>
/// 获得线上的Rss信息 / XML格式的</br>
/// 订阅信息
/// </summary>
public class LoadOnlineXml
{
private readonly string rssPath;
private readonly string encoding;
/// <summary>
///
/// </summary>
/// <param name="rssPath"> Rss地址 , 如 : http://news.163.com/special/00011K6L/rss_newstop.xml </param>
/// <param name="encoding"> 此Rss的编码格式</param>
public LoadOnlineXml(string rssPath , string encoding )
{
this.rssPath = rssPath;
this.encoding = encoding;
}
/// <summary>
/// 打印目标Rss
/// </summary>
public void writeRss()
{
WebClient web = new WebClient();
Stream stream = web.OpenRead(this.rssPath);
StreamReader reader = new StreamReader(stream, Encoding.GetEncoding(this.encoding));
string rssText = reader.ReadToEnd();
Console.WriteLine(rssText);
stream.Close();
reader.Close();
}
}
}
2,读取XML
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
namespace XmlTest.com
{
/// <summary>
/// 读取XML
/// </summary>
public class ReaderXml
{
private readonly string xmlPath;
/// <summary>
///
/// </summary>
/// <param name="xmlPath">XML的地址</param>
public ReaderXml(string xmlPath)
{
this.xmlPath = xmlPath;
}
/// <summary>
/// 读XML信息
/// </summary>
public void readXML()
{
string str = "";
XmlReader reader = XmlReader.Create( this.xmlPath );
int i = 0 , j = 0;
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
str += "节点名 : " + reader.Name
+ Environment.NewLine;
str += ", 节点类型 : " + reader.NodeType
+ Environment.NewLine;
str += ", 节点深度 : " + reader.Depth
+ Environment.NewLine;
if (reader.HasAttributes) // 是否存在属性
{
for (i = 0, j = reader.AttributeCount; i < j; i += 1)
{
reader.MoveToAttribute(i);
str += " 属性 : " + reader.Name + " 值为 : " + reader.Value
+ Environment.NewLine;
}
}
}
else if ( reader.NodeType == XmlNodeType.Text )
{
if (reader.HasValue) //是否存在文本值
{
str += ", 节点的文本值 : " + reader.Value
+ Environment.NewLine;
}
}
else
{
}
}
reader.Close();
Console.WriteLine(str);
}
}
}
3,创建一个XML文件
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;
namespace XmlTest.com
{
/// <summary>
/// 模拟没有xml的时候重建一个XML文件
/// </summary>
public class XmlWriterDefault
{
private readonly string xmlpath;
/// <summary>
///
/// </summary>
/// <param name="xmlpath">xml路径</param>
public XmlWriterDefault(string xmlpath)
{
this.xmlpath = xmlpath;
}
/// <summary>
/// 编写一个基本的XML文件
/// </summary>
///<param name="encoding"> 编码格式 </param>
public void writerDefault( Encoding encoding )
{
if ( !File.Exists( this.xmlpath ) )
{
XmlWriterSettings writer = new XmlWriterSettings();
writer.Encoding = encoding;
using( XmlWriter w = XmlWriter.Create( this.xmlpath , writer ))
{
w.WriteStartElement("fristElement");
w.WriteAttributeString("name" , "Ainy");
w.WriteAttributeString("gender", "male");
w.WriteEndElement();
w.Flush();
}
}
}
}
}
4 , 核心操作
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
namespace XmlTest.com
{
/// <summary>
/// 对XML信息的增,删,改
/// </summary>
public class XmlMainHandler
{
private readonly string xmlPath;
/// <summary>
///
/// </summary>
/// <param name="xmlPath">目标XML的地址</param>
public XmlMainHandler(string xmlPath)
{
this.xmlPath = xmlPath;
}
/// <summary>
/// 增加一个属性
/// </summary>
/// <param name="name"> 属性名称 </param>
/// <param name="value"> 属性值 </param>
public void addAttribute(string name, string value , string targetName )
{
XmlDocument xdoc = new XmlDocument();
xdoc.Load(this.xmlPath);
foreach (XmlElement xElement in xdoc.DocumentElement.ChildNodes)
{
foreach (XmlElement xE in xElement.ChildNodes)
{
Console.WriteLine("属性值 : " + xE.GetAttribute("name"));
if (xE.GetAttribute("name") == targetName)
{
XmlAttribute xA = xdoc.CreateAttribute(name);
xA.Value = value;
xE.Attributes.Append(xA);
break;
}
}
}
xdoc.Save(this.xmlPath);
}
/// <summary>
/// 删除一个属性
/// </summary>
/// <param name="AttributeName"></param>
public void removeAttribute(string AttributeName)
{
XmlDocument xdoc = new XmlDocument();
xdoc.Load(this.xmlPath);
XmlNode targetNote = xdoc.SelectSingleNode(@"friends/friend/describe"); //!important : 第一次找到的friends/friend/describe , 如果没有找到,返回null
if (targetNote != null)
{
// 定义一个属性
if (targetNote.Attributes[AttributeName] != null)
{
targetNote.Attributes.Remove(targetNote.Attributes[AttributeName]);
}
else
{
Console.WriteLine("此节点没有'{0}'属性", AttributeName);
}
}
else
{
Console.WriteLine("没有找到 friends/friend/describe 请检查");
}
xdoc.Save(this.xmlPath);
}
/// <summary>
/// 修改一个属性
/// </summary>
/// <param name="AttributeName"></param>
/// <param name="value"></param>
public void editorAttribute(string AttributeName, string value)
{
XmlDocument xdoc = new XmlDocument();
xdoc.Load(this.xmlPath);
XmlNodeList targetList = xdoc.SelectNodes(@"friends/friend/base");
foreach (XmlNode target in targetList)
{
if (target.Attributes[AttributeName] != null)
{
if (target.Attributes[AttributeName].Value == "eisa")
{
target.Attributes[AttributeName].Value = "eisa-" + value;
target.InnerText = "XXX"; //加一个Text
xdoc.Save(this.xmlPath);
return;
}
}
}
Console.WriteLine("修改属性 失败");
}
}
}
附件 : XML friends.xml
<?xml version="1.0" encoding="utf-8"?> <friends> <friend> <base name="eisa-snow" tel="135244&&&" gender="female">XXX</base> <describe>my ---</describe> </friend> <friend> <base name="kawen" tel="13533449078" gender="male" 亲密度="80%" /> <describe>my ****</describe> </friend> </friends>