C#Xpath解析HtmlDocument的使用方法与递归取得页面所有标签xpath值(附源码)
在学习HTML Xpath之前呢我们先来下载一下Dll文件
下载地址:http://htmlagilitypack.codeplex.com/
大家下载单击如下图片下载就行了
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接下来就是在程序中引用一下,
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然后就可以直接调用 了,大家看看
代码吧
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//htmlDcoument对象用来访问Html文档s
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HtmlAgilityPack.HtmlDocument hd = new HtmlAgilityPack.HtmlDocument();
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//加载Html文档
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hd.LoadHtml(strhtml);
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string str = hd.DocumentNode.SelectSingleNode("//*[@id='e_font']").OuterHtml;
这样就可以得到一个标签的HTml代码了
OuterHtml是取包含本身的Html如果是InnerHtml就是取的包含在这个标签之内的所有Html代码了
这点大家要注意了
如果大家想获取Html代码的Xpath路径就是这部分
- //*[@id='e_font']
这个其实很简单只在大家安装一个Firbug就行了,
看下图片
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大家只要进入选择模式,然后选择你要的内容,然后右键复制一下就行了。
然后放在SelectSingleNode()方法里就OK了
下面我说说几个方法和属性的意思吧、
方法
SelectNodes 获取的是一个集合
SelectSingleNode 获取一个标签
SetAttributeValue 设置标签的属性值例如:SetAttributeValue("name","xpath-89");这说明把name属性的值修改为xpath-89
属性
OuterHtml 是取包含本身的Html
InnerHtml 取的包含在这个标签之内的所有Html代码了
XPath 获取相对应的Xpath值
Attributes 获取一个属性的值例如:Attributes("name")
也可以进行添加属性例如:
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hd.DocumentNode.SelectSingleNode(item.Key).Attributes.Add("xpathid", "xpath_1" );
下面我写了一个递归获取Html页面所有Xpath值的方法大家看一下吧
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//key(Xpath),value(整个节点)
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public List<ObjXpath> XpathList = new List<ObjXpath>();
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public string strhtml = "";//这里就是你的Html代码具体怎么获取请参考我的<a href=\"http://www.sufeinet.com/thread-3-1-1.html\" target=\"_blank\">HttpHelper</a>类吧
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private int Index = 0;
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//开始处理Node
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private void SartNode()
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{
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//htmlDcoument对象用来访问Html文档s
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HtmlAgilityPack.HtmlDocument hd = new HtmlAgilityPack.HtmlDocument();
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//加载Html文档
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hd.LoadHtml(strhtml);
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HtmlNodeCollection htmllist = hd.DocumentNode.ChildNodes;
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Index = 0;
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XpathList.Clear();
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foreach (HtmlNode em in htmllist)
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{
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Setxpath(em);
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}
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}
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/// <summary>
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/// 递归获取Html Dom
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/// </summary>
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/// <param name="node">要处理的节点</param>
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private void Setxpath(HtmlNode node)
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{
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foreach (HtmlNode item in node.ChildNodes)
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{
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if (item.XPath.Contains("#"))
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{
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continue;
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}
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if (item.ChildNodes.Count > 0)
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{
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XpathList.Add(new ObjXpath() { id = Index.ToString(), Key = item.XPath, Value = "" });
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Index++;
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Setxpath(item);
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}
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else
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{
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XpathList.Add(new ObjXpath() { id = Index.ToString(), Key = item.XPath, Value = "" });
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Index++;
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}
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}
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}
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public class ObjXpath
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{
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public string id { get; set; }
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public string Key { get; set; }
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public string Value { get; set; }
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}
XpathList 就是获取的所有Xpath值了,大家有兴趣的话可以试试
我们先来看看效果吧
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好了下面放出所有代码给大家
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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using System.Text.RegularExpressions;
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using System.Threading;
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using HtmlAgilityPack;
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using System.IO;
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using System.Runtime.Serialization.Json;
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namespace AutoXpathTools
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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}
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#region 私有变量和方法
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//委托传入一个字符串
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private delegate void SetListBox(string str);
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//key(Xpath),value(整个节点)
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List<ObjXpath> XpathList = new List<ObjXpath>();
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private int Index = 0;
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//htmlDcoument对象用来访问Html文档
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HtmlAgilityPack.HtmlDocument hd = new HtmlAgilityPack.HtmlDocument();
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#endregion
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//分析Xpath的所有代码
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private void btnGetXpath_Click(object sender, EventArgs e)
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{
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try
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{
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HttpHelper http = new HttpHelper();
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HttpItem item = new HttpItem() { URL = textBox1.Text.Trim(), IsToLower = false, Encoding = "gbk" };
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txtXml.Text = http.GetHtml(item);
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if (!string.IsNullOrWhiteSpace(txtXml.Text) && txtXml.Text.Trim().ToLower() != "error")
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{
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//加载Html文档
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hd.LoadHtml(txtXml.Text);
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Thread pingTask = new Thread(new ThreadStart(delegate
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{
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//代码,线程要执行的代码
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SartNode(txtXml.Text);
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}));
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pingTask.Start();
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}
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else
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{
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txtXml.Text = "根据您的的ULR:" + textBox1.Text.Trim() + "无法得到任何内容";
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}
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}
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catch (Exception ex)
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{
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txtXml.Text = ex.Message.Trim();
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}
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}
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//开始处理Node
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private void SartNode(string strhtml)
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{
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//htmlDcoument对象用来访问Html文档s
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HtmlAgilityPack.HtmlDocument hd = new HtmlAgilityPack.HtmlDocument();
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//加载Html文档
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hd.LoadHtml(strhtml);
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HtmlNodeCollection htmllist = hd.DocumentNode.ChildNodes;
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Index = 0;
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XpathList.Clear();
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foreach (HtmlNode em in htmllist)
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{
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Setxpath(em);
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}
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}
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/// <summary>
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/// 递归获取Html Dom
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/// </summary>
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/// <param name="node">要处理的节点</param>
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private void Setxpath(HtmlNode node)
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{
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foreach (HtmlNode item in node.ChildNodes)
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{
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if (item.XPath.Contains("#"))
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{
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continue;
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}
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if (item.ChildNodes.Count > 0)
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{
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XpathList.Add(new ObjXpath() { id = Index.ToString(), Key = item.XPath, Value = "" });
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UIContorol(item.XPath);
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Index++;
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Setxpath(item);
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}
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else
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{
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XpathList.Add(new ObjXpath() { id = Index.ToString(), Key = item.XPath, Value = "" });
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UIContorol(item.XPath);
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Index++;
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}
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}
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}
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//使用委托给控件赋值
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private void UIContorol(string str)
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{
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listBox1.Items.Add(str);
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toolStripStatusLabel1.Text = str;
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}
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private void listBox1_SelectedValueChanged(object sender, EventArgs e)
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{
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if (listBox1.SelectedItem != null)
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{
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txtPath.Text = listBox1.SelectedItem.ToString().Trim();
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}
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}
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private void button3_Click(object sender, EventArgs e)
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{
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txtContents.Text = hd.DocumentNode.SelectSingleNode(txtPath.Text.Trim()).OuterHtml;
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}
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private void Form1_Load(object sender, EventArgs e)
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{
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//HttpItem item = new HttpItem()
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//{
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// URL = "http://www.diandian.com/login",
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// Method = "post",
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// Cookie = "dtid=ZfXUVo1IsplHR4mHW1HYmgKbY4GJa003; kvf=1358855337188; alf=1; dru=1356356040; _l5=y",
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// ContentType = "application/x-www-form-urlencoded",
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// Postdata = "account=xinsuilie1998@163.com&password=wjlove520&nextUrl=&lcallback=&persistent=1",
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// Referer = "http://www.diandian.com/logout?formKey=e4714d863c862a84fafd83d98e5ecb22"
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//};
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//HttpHelper http = new HttpHelper();
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//string html = http.GetHtml(item);
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//string cookie = item.Cookie;
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//item = new HttpItem() { URL = "http://www.diandian.com/home", Cookie = cookie };
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//html = http.GetHtml(item);
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}
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}
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public class ObjXpath
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{
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public string id { get; set; }
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public string Key { get; set; }
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public string Value { get; set; }
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}
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}
就到这里吧,大家可以下载我的源代码试试手
打包下载:
<ignore_js_op> AutoXpathTools.zip (76.32 KB, 下载次数: 0)
如果你感觉可以话就给我推荐一下吧。感谢大家
posted on 2013-03-11 11:15 HOT SUMMER 阅读(15727) 评论(1) 编辑 收藏 举报