Winista.Text.HtmlParser; 获取html

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;

using Winista.Text.HtmlParser;
using Winista.Text.HtmlParser.Lex;
using Winista.Text.HtmlParser.Util;
using Winista.Text.HtmlParser.Tags;
using Winista.Text.HtmlParser.Filters;

namespace Leo.GetOrganzation
{
    public partial class FormLeo : Form
    {
        IList<string> siteList = new List<string>();

        public FormLeo()
        {
            InitializeComponent();
            this.InitSet();
        }

        private void InitSet()
        {
            this.comboBoxArea.SelectedIndex = 0;
        }

        private void comboBoxArea_SelectedIndexChanged(object sender, EventArgs e)
        {
            string strUrl = string.Empty;
            switch (this.comboBoxArea.SelectedIndex)
            {
                case 0:
                    strUrl = string.Empty;
                    break;
                case 1:
                    strUrl = "http://www.alexa.com/topsites/global;{0}";
                    break;
                case 2:
                    strUrl = "http://www.alexa.com/topsites/countries;{0}/CN";
                    break;
                case 3:
                    strUrl = "http://www.alexa.com/topsites/countries;{0}/HK";
                    break;
                case 4:
                    strUrl = "http://www.alexa.com/topsites/countries;{0}/MO";
                    break;
                case 5:
                    strUrl = "http://www.alexa.com/topsites/countries;{0}/TW";
                    break;
            }

            this.txtUrlText.Text = strUrl;

            this.textBox1.Text = "";
            this.textBox2.Text = "";
            this.textBox3.Text = "";

        }

        private void btnGetRes_Click(object sender, EventArgs e)
        {
            siteList = new List<string>();
            if (this.comboBoxArea.SelectedIndex == 0)
            {
                MessageBox.Show("请选择区域");
                return;
            }

            for (int i = 0; i < int.Parse(this.textBox3.Text.Trim()); i++)
            {

                string urlLink = string.Format(this.txtUrlText.Text.Trim(),i);
                string temp = this.GetRes(urlLink);

                this.GetSiteName(temp);

                System.Threading.Thread.Sleep(1000);
                Application.DoEvents();
            }

            ////string temp = this.GetRes("http://www.alexa.com/topsites/countries;19/TW");

            ////this.GetSiteName(temp);

       
            MessageBox.Show("获取完毕，待导出");
        }

        private void GetSiteName(string strhtml)
        {
            Parser parser = Parser.CreateParser(strhtml, null);
            NodeList nodes = parser.ExtractAllNodesThatMatch(new TagNameFilter("h2"));
          
            for (int i = 0; i < nodes.Count; i++)
            {
                siteList.Add(nodes[i].Children[1].ToPlainTextString());
            }
           
        }

        private string GetRes(string Url)
        {

            string strResult = string.Empty;
            try
            {
                HttpWebRequest request =(HttpWebRequest)WebRequest.Create(Url);
                request.Timeout = 30000;
                request.Headers.Set("Pragma", "no-cache");

                HttpWebResponse response =(HttpWebResponse)request.GetResponse();

                Stream streamReceive = response.GetResponseStream();
                Encoding encoding = Encoding.GetEncoding("utf-8");
                StreamReader streamReader =new StreamReader(streamReceive, encoding);
                strResult = streamReader.ReadToEnd();
            }
            catch(Exception) {}

            return strResult;
        }

        private void WriteTxt()
        {
            string sucessFile = Application.StartupPath;
            string selectText = this.comboBoxArea.SelectedItem.ToString();
            if (File.Exists(string.Format("{0}\{1}.txt", sucessFile, selectText)))
            {
                File.Delete(string.Format("{0}\{1}.txt", sucessFile, selectText));
            }
            StreamWriter sw = new StreamWriter(string.Format("{0}\{1}.txt", sucessFile, selectText),true);
            try
            {
                foreach (string item in siteList)
                {
                    sw.WriteLine(item+" "+selectText);
                }
                sw.Dispose();
                sw.Close();
                MessageBox.Show("导出OK");
               
            }
            catch (Exception)
            {
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (this.comboBoxArea.SelectedIndex == 0)
            {
                MessageBox.Show("请选择区域");
                return;
            }
            if (siteList.Count == 0)
            {
                MessageBox.Show("没有数据");
                return;
            }
            WriteTxt();
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
           
            int countPage = int.Parse(this.textBox3.Text.Trim());
            this.textBox1.Text = string.Format(this.txtUrlText.Text.Trim(), 0);
            this.textBox2.Text = string.Format(this.txtUrlText.Text.Trim(), countPage - 1);
        }

    }
}