一、窗体应用程序界面：

二、上源码：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Net;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WebCatchTest0911

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

public static CookieCollection CC = new CookieCollection();

private void btn_Start_Click(object sender, EventArgs e)

{

string str = GetWebPageSource(textBox1.Text.Trim());

}

public static string GetWebPageSource(string Url)

{

if (Url.Contains("about"))

{

Url = Url.Replace("about", "http");

}

try

{

//http://brand.tmall.com/brandMap.htm

HttpWebRequest MyRequest = (HttpWebRequest)WebRequest.Create(Url);

MyRequest.Method = "GET";

MyRequest.Headers.Add("Accept-Encoding", "GBK");

MyRequest.Headers.Add("Accept-Language", "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");

MyRequest.Headers.Add("Cache-Control", "max-age=0");

MyRequest.KeepAlive = true;

MyRequest.Host = "www.icoolbr.com";

MyRequest.ProtocolVersion = HttpVersion.Version11;

MyRequest.ContentType = "text/html; charset=GBK";

MyRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36";

MyRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

MyRequest.AllowAutoRedirect = true;

MyRequest.CookieContainer = new CookieContainer();

MyRequest.CookieContainer.Add(CC);

HttpWebResponse MyResponse = (HttpWebResponse)MyRequest.GetResponse();

StreamReader srd = new StreamReader(MyResponse.GetResponseStream(), Encoding.GetEncoding("GBK"));

string txt = srd.ReadToEnd();

CC = MyResponse.Cookies;

srd.Close();

srd.Dispose();

return txt;

}

catch { return ""; }

}

}

}

三、总结

1）、HttpWebRequest的参数可以通过浏览器查看（F12）；

2）、注意释放资源；

四、下章实现提取网页内容