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.Threading;namespace ProgressBarSample
{//定义委托，异步调用delegate void ShowProgressDelegate(int totalStep, int currentStep);public partial class Form1 : Form{public Form1(){InitializeComponent();}/// <summary>/// /// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnStart_Click(object sender, EventArgs e){ParameterizedThreadStart start = new ParameterizedThreadStart(SetProgress);Thread progressThread = new Thread(start);progressThread.IsBackground = true;//标记为后台进程，在窗口退出时，正常退出
            progressThread.Start();}/// <summary>/// 设置当前进度/// </summary>/// <param name="state"></param>void SetProgress(object state){for (int i = 1; i <= 100; i++){Thread.Sleep(200);object[] objs = new object[] { 100, i };//异步调用this.Invoke(new ShowProgressDelegate(ShowProgress), objs);}}/// <summary>/// 刷新进度条/// </summary>/// <param name="totalStep"></param>/// <param name="currentStep"></param>void ShowProgress(int totalStep, int currentStep){this.progressBar1.Maximum = totalStep;this.progressBar1.Value = currentStep;this.lbCurrent.Text = this.progressBar1.Value * 100 / progressBar1.Maximum + "%";}}
}

using System;
using System.Net;namespace Reptile
{public class NetReptile{/// <summary>/// /// </summary>public string Url { get; set; }/// <summary>/// /// </summary>/// <param name="url"></param>public NetReptile(string url){this.Url = url;}/// <summary>/// /// </summary>/// <returns></returns>public string GetContent(){WebClient client = new WebClient();return client.DownloadString(new Uri(this.Url));}}
}

using System;
using System.Text;
using System.Text.RegularExpressions;namespace Reptile
{/// <summary>/// HTML解析器/// </summary>public class HtmlAnalyzer{/// <summary>/// 构造函数/// </summary>public HtmlAnalyzer(){ }/// <summary>/// 获取标题/// </summary>/// <param name="html"></param>/// <returns></returns>public string GetTitle(string html){Regex regext = new Regex("(?<=<title>).*?(?=</title>)");Match m = regext.Match(html);if (m != null){return m.ToString();                }return null;}}
}

   /// <summary>/// 多线程处理/// </summary>private void MultiThread(){string urls = tbUrl.Text;string[] separater = { "\r\n" };string[] urlList = urls.Split(separater, StringSplitOptions.RemoveEmptyEntries);int i = 1;foreach (var url in urlList){Thread thread = new Thread(new ParameterizedThreadStart(Snap));thread.Name = "Thread" + i.ToString();thread.Start(url);i++;}//RefreshData();
        }/// <summary>/// 抓取数据/// </summary>/// <param name="state"></param>private void Snap(object state){string url = state as string;NetReptile reptile = new NetReptile(url);string html = reptile.GetContent();if (!string.IsNullOrEmpty(html)){HtmlAnalyzer analyzer = new HtmlAnalyzer();string title = analyzer.GetTitle(html);Thread.Sleep(2000);this.Invoke(new AddItemDelegate(this.AddItem),title);                }}/// <summary>/// /// </summary>/// <param name="item"></param>private void AddItem(string item){this.listData.Items.Add(item);}