Main.cs

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using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Web;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading;
using System.Collections.Generic;
namespace WindowsFormsApplication7
{

    public partial class Form1 : Form
    {
        public static int allIndex = 0;
        StringBuilder str = new StringBuilder();
        private Label tbx = new Label();
        Thread th = null;

        public Form1()
        {
            InitializeComponent();

        }
        // 下载于www.51aspx.com
        private void button1_Click(object sender, EventArgs e)
        {
            if (comboBox1.Text.IndexOf("http://") == -1 && comboBox1.Text.IndexOf("https://") == -1)
            {
                comboBox1.Text = "http://" + comboBox1.Text;
            }
            int index = comboBox1.SelectedIndex;
            if (index == 0 || comboBox1.Text == "http://baidu.com" || comboBox1.Text == "http://baidu.com/" || comboBox1.Text == "http://www.baidu.com" || comboBox1.Text == "http://www.baidu.com/")
            {
                comboBox1.Text = "http://www.baidu.com/#wd=" + UrlCode(textBox2.Text, "UTF-8") + "&rsv_bp=0&tn=baidu&rsv_spt=3&ie=utf-8&rsv_sug3=3&rsv_sug4=155&rsv_sug1=3&inputT=873";
            }
            if (index == 1 || comboBox1.Text == "http://www.google.cn/" || comboBox1.Text == "http://www.google.cn" || comboBox1.Text == "http://www.google.com.hk/webhp?hl=zh-CN&sourceid=cnhp" || comboBox1.Text.IndexOf("http://www.google.com.hk/webhp") != -1)
            {
                comboBox1.Text = "https://www.google.com.hk/search?num=100&newwindow=1&safe=strict&site=webhp&source=hp&q=" + UrlCode(textBox2.Text, "UTF-8");
            }
            if (index == 2 || comboBox1.Text == "http://www.sogou.com/" || comboBox1.Text == "http://www.sogou.com")
            {
                comboBox1.Text = "http://www.sogou.com/web?q=by+discuz+x3.1&query=" + UrlCode(textBox2.Text, "UTF-8") + "&fieldtitle=&fieldcontent=&fieldstripurl=&bstype=&ie=utf8&exclude=&sitequery=&located=0&tro=off&filetype=&num=100";
            }

            Uri url = new Uri(comboBox1.Text);
            webBrowser1.Url = url;
        }
        public string UrlCode(string str, string encode)
        {
            string tmp = HttpUtility.UrlEncode(str, Encoding.GetEncoding(encode));
            return tmp;
            // 下载于www.51aspx.com
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string html = webBrowser1.Document.Body.InnerHtml;
            if (comboBox1.Text.IndexOf("baidu") != -1)
            {